CN105301878B - Wavelength converter and preparation method thereof, related lighting fixtures and optical projection system - Google Patents

Abstract

The present invention provides a kind of Wavelength converter and preparation method thereof, related lighting fixtures and optical projection system, including：Inorganic wavelength conversion layer comprising inorganic cementitious material and first wave length transition material, for absorbing exciting light and producing the first stimulated light；Organic wavelength conversion layer on one surface of inorganic wavelength conversion layer is stacked and placed on, organic wavelength conversion layer includes organic binding material and second wave length transition material, for absorbing first stimulated light and producing the second stimulated light；Organic wavelength conversion layer is bonded connection with the inorganic wavelength conversion layer.Compared with second wave length transition material directly absorbs the mode that exciting light produces the second stimulated light, the heat that inorganic wavelength conversion layer and organic wavelength conversion layer in the present invention produce is less, the temperature of Wavelength converter is relatively low, and the light efficiency of the second stimulated light of acquisition is higher.

Description

Wavelength conversion device and its preparation method, related light emitting device and projection system

technical field

The present invention relates to the technical field of laser display, and more specifically, relates to a wavelength conversion device and a preparation method thereof, a related light emitting device and a projection system.

Background technique

In the existing semiconductor light source projection system, the excitation light emitted by light sources such as light-emitting diodes or laser diodes is incident on different wavelength conversion materials of the wavelength conversion device to generate different colors of the stimulated light with a wavelength greater than the wavelength of the excitation light, such as red Stimulate the laser, green and blue, and then combine the different colors of the light into one beam to display the projected image.

In the process of the wavelength conversion material absorbing the excitation light and generating the subject light, not all the energy is absorbed and converted into the subject light, but part of the energy is dissipated as heat, so that the temperature of the wavelength conversion material is higher , affecting the life of the wavelength conversion material and the light effect of the generated laser light. Moreover, the lower the conversion efficiency of the wavelength conversion material, the more heat will be generated, and the conversion efficiency of the wavelength conversion material for red laser light is the lowest.

With the continuous improvement of people's requirements for the brightness of the projection screen, the optical power of the excitation light is getting higher and higher, and the temperature of the wavelength conversion material and the wavelength conversion device is also rising. Therefore, how to reduce the temperature of the wavelength conversion material and the wavelength conversion device, Improving the light efficiency of the laser has become one of the technical bottlenecks that need to be solved urgently in the industry.

Contents of the invention

In view of this, the present invention provides a wavelength conversion device and its preparation method, a related light-emitting device and a projection system, so as to reduce the temperature of the wavelength conversion material and the wavelength conversion device and improve the light efficiency of the received laser light.

To achieve the above object, the present invention provides the following technical solutions:

A wavelength conversion device, comprising:

An inorganic wavelength conversion layer comprising an inorganic bonding material and a first wavelength conversion material, used to absorb excitation light and generate first stimulated light;

an organic wavelength conversion layer stacked on one surface of the inorganic wavelength conversion layer, the organic wavelength conversion layer includes an organic bonding material and a second wavelength conversion material for absorbing the first received light and generating a second received light ;

The organic wavelength conversion layer is bonded to the inorganic wavelength conversion layer.

Preferably, the second wavelength conversion material is also used to absorb the excitation light and generate the third stimulated light.

Preferably, it also includes:

The first optical film located on the surface of the inorganic wavelength conversion layer away from the organic wavelength conversion layer is used to transmit the excitation light and reflect the first subject light.

Preferably, it also includes:

The second optical film located on the surface of the organic wavelength conversion layer away from the inorganic wavelength conversion layer is used to reflect the first received light and transmit the second received light.

Preferably, the inorganic bonding material is glass frit, the first wavelength converting material is yellow phosphor; the organic bonding material is silica gel or epoxy resin, and the second wavelength converting material is red phosphor.

Preferably, the thickness of the inorganic wavelength conversion layer ranges from 90 μm to 110 μm; the thickness of the organic wavelength conversion layer ranges from 60 μm to 70 μm.

A method for preparing a wavelength conversion device, comprising:

Step 1: preparing an inorganic wavelength conversion layer by using an inorganic bonding material and a first wavelength conversion material;

Step 2: forming an organic wavelength conversion layer on one surface of the inorganic wavelength conversion layer by using an organic adhesive material and a second wavelength conversion material, so that the organic wavelength conversion layer and the inorganic wavelength conversion layer are bonded and connected.

Preferably, the process in step 2 is:

An organic wavelength conversion layer is formed on a surface of the inorganic wavelength conversion layer by means of precipitation deposition.

Preferably, the mode of the precipitation deposition is specifically:

placing the inorganic wavelength conversion layer inside the container;

Pour the pre-prepared silane coupling agent hydrolysis solution with the second wavelength conversion material into the container;

After the hydrolysis solution of the silane coupling agent is precipitated and deposited, an organic wavelength conversion layer is formed on one surface of the inorganic wavelength conversion layer.

A wavelength conversion device, comprising at least a first subsection and a second subsection, wherein the first subsection includes an inorganic wavelength conversion layer and an organic wavelength conversion layer that are laminated and bonded to each other, and the inorganic wavelength conversion layer includes an inorganic adhesive The junction material and the first wavelength conversion material are used to absorb the excitation light and generate the first received light; the organic wavelength conversion layer includes an organic bonding material and a second wavelength conversion material, which is used to absorb the first received light and generate the first received light the second laser;

The second subregion includes an inorganic bonding material and a third wavelength conversion material for absorbing the excitation light and generating a third received light different from the second received light.

A light-emitting device, comprising the above-mentioned wavelength conversion device.

A projection system includes the above-mentioned light emitting device.

Compared with the prior art, the technical solution provided by the present invention has the following advantages:

In the projection system, light emitting device, wavelength conversion device and preparation method thereof provided by the present invention, after the inorganic wavelength conversion layer absorbs the excitation light and generates the first received light, the organic wavelength conversion layer absorbs the first received light and generates the second received light Since the conversion efficiency of the first wavelength conversion material in the inorganic wavelength conversion layer is higher than that of the second wavelength conversion material in the organic wavelength conversion layer, it is different from the way that the second wavelength conversion material directly absorbs the excitation light to generate the second received light Compared with the inorganic wavelength conversion layer and the organic wavelength conversion layer in the present invention, the heat generated is less, the temperature of the wavelength conversion device is lower, and the light efficiency of the second received light is higher.

Moreover, since the organic wavelength conversion layer is bonded to the inorganic wavelength conversion layer, and the thermal conductivity of the organic wavelength conversion layer is better, the heat in the inorganic wavelength conversion layer can be dissipated quickly, thereby effectively reducing the wavelength conversion. The temperature of the device improves the performance of products such as lighting devices and projection systems. In addition, the inorganic wavelength conversion layer is used as a layer for absorbing excitation light, and the inorganic binder therein has better high temperature resistance performance than the organic binder in the organic wavelength conversion layer, which can prevent damage to the organic wavelength conversion layer due to high temperature. Thus, the lifetime of the light emitting device is improved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a wavelength conversion device provided in Embodiment 1 of the present invention;

FIG. 2 is a distribution diagram of another wavelength conversion device provided in Embodiment 1 of the present invention;

FIG. 3 is a schematic structural diagram of another wavelength conversion device provided in Embodiment 1 of the present invention;

FIG. 4 is a schematic structural diagram of another wavelength conversion device provided in Embodiment 1 of the present invention;

FIG. 5 is a flow chart of a method for manufacturing a wavelength conversion device provided in Embodiment 2 of the present invention;

FIG. 6 is a flow chart of the manufacturing method of the wavelength conversion device provided by Embodiment 3 of the present invention.

Detailed ways

The above is the core idea of the present invention. In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings.

In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present invention. By analogy, the present invention is therefore not limited to the specific examples disclosed below.

Secondly, the present invention is described in detail in combination with schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional view showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, and it should not be limited here. The protection scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual preparation.

The following describes in detail through several embodiments.

Embodiment one

This embodiment provides a wavelength conversion device, as shown in Figure 1, comprising an inorganic wavelength conversion layer 130, an organic wavelength conversion layer 140 stacked on one surface of the inorganic wavelength conversion layer 130, the organic wavelength conversion layer 140 and the inorganic wavelength conversion layer The conversion layer 130 is bonded.

Wherein, the inorganic wavelength conversion layer 130 includes an inorganic bonding material and a first wavelength conversion material, for absorbing the excitation light λ ₀ and generating the first received light λ ₁ (not shown in the figure), the thickness of the inorganic wavelength conversion layer 130 The range is from 90 μm to 110 μm, including endpoint values; the organic wavelength conversion layer 140 includes an organic bonding material and a second wavelength conversion material for absorbing the first received light λ ₁ and generating the second received light λ ₂ , the organic wavelength The thickness of the conversion layer 140 ranges from 60 μm to 70 μm, including the endpoint values. In addition, the second wavelength conversion material is also used to absorb the excitation light and generate the third excitation light. In this embodiment, the wavelength of the second subject light λ ₂ is greater than the wavelength of the first subject light λ ₁ , and the wavelength of the first subject light λ ₁ is greater than the wavelength of the excitation light λ ₀ , that is, the wavelength of the present invention is located at the wavelength of the excitation light λ ₀ The first stimulated light λ ₁ between the second stimulated light λ ₂ divides the process of directly converting the excitation light λ ₀ into the second stimulated light λ ₂ into absorbing the excitation light λ ₀ to produce the first stimulated beam λ ₁ and absorbing the second stimulated light λ 1 There are two processes in which a subject beam λ ₁ produces a second subject beam λ ₂ .

Because the conversion efficiency of the first wavelength conversion material is higher than that of the second wavelength conversion material, therefore, the heat generated in the first process is less, and the light efficiency of the first received light _λ1 obtained is higher, so that the first received light The light efficiency of the second subject light _λ2 excited by the laser _λ1 is also higher, and the heat generated is also less, thus compared with the way that the second wavelength conversion material directly absorbs the excitation light _λ0 to generate the second subject light _λ2 In this embodiment, the inorganic wavelength conversion layer and the organic wavelength conversion layer generate less heat, the temperature of the wavelength conversion device is lower, and the light efficiency of the second received light is higher.

In this embodiment, a wavelength conversion device combining an inorganic wavelength conversion layer and an organic wavelength conversion layer is used to form the second received light. Although a wavelength conversion device with a double-layer inorganic wavelength conversion layer can also be used, due to the organic wavelength The thermal conductivity of the conversion layer is better, so the heat in the inorganic wavelength conversion layer can be dissipated quickly, thereby effectively reducing the temperature of the wavelength conversion device and improving the performance of products such as light emitting devices and projection systems. And, in addition, the inorganic wavelength conversion layer is used as a layer for absorbing excitation light, and the inorganic binder therein has more excellent high temperature resistance performance than the organic binder in the organic wavelength conversion layer, which can prevent high temperature from affecting the organic wavelength conversion layer. damage, thereby increasing the life of the light emitting device.

In addition, compared with the wavelength conversion device with double organic wavelength conversion layers, the wavelength conversion device in this embodiment does not need to add additional inorganic fillers to increase the hardness of the film layer, which reduces the cost and simplifies the process; moreover, for Dual organic wavelength conversion layers, the wavelength conversion layer on the incident side of the excitation light is directly irradiated by laser light, and this high power density excitation light will cause the organic adhesive to age rapidly. For the dual inorganic wavelength conversion layer, due to the poor thermal stability of the red phosphor, its degradation decomposition temperature is close to the softening temperature of the glass frit, and the glass frit is sintered at a temperature lower than its softening point, which will not achieve good bonding , and lead to a large number of pores to increase the thermal resistance of the wavelength conversion layer.

In this embodiment, the organic wavelength conversion layer and the inorganic wavelength conversion layer are bonded and connected, and hydrogen bonds or chemical bonds are formed between the two, so that the two layers are closely connected, and the interface thermal resistance of the two layers is small, so that the inorganic wavelength conversion layer The generated heat can be quickly transferred to the organic wavelength conversion layer.

Of course, the inorganic wavelength conversion layer and the organic wavelength conversion layer are not limited to this connection method, and in another embodiment of the present invention, they can also be connected in other ways. As shown in Figure 2, the wavelength conversion device includes at least a first partition 31 and the wavelength conversion sheet of the second subregion 32, that is, the fluorescent color wheel. Of course, the area sizes of the first subregion 31 and the second subregion 32 can be adjusted according to actual needs.

The structural schematic view of the wavelength conversion device, as shown in FIG. 3 , the first subregion 31 includes an inorganic wavelength conversion layer 310 and an organic wavelength conversion layer 311 that are stacked and bonded to each other, and the inorganic wavelength conversion layer 310 includes an inorganic bonding material. and a first wavelength conversion material for absorbing the excitation light λ ₀ and generating the first subject light λ ₁ ; the organic wavelength conversion layer 311 includes an organic bonding material and a second wavelength conversion material for absorbing the first subject light Laser λ ₁ and generate the second subject light λ ₂ ; the second subregion 32 includes an inorganic bonding material and a third wavelength conversion material for absorbing the excitation light λ ₀ and generating a third beam different from the second subject light λ ₂ By laser light λ ₃ .

Wherein, the wavelength conversion device also includes a driving device, which is used to drive the above-mentioned fluorescent color wheel to rotate along the central axis, so that the excitation light λ ₀ is incident on the wavelength conversion materials of the first subregion 31 and the second subregion 32 according to a certain timing, and sequentially Generate corresponding received light.

In yet another embodiment of the present invention, as shown in FIG. 4 , the wavelength conversion device not only includes the inorganic wavelength conversion layer 130 and the organic wavelength conversion layer 140, but also includes a first optical fiber on the other surface of the inorganic wavelength conversion layer 130. The film 120 and the second optical film 150 located on the other surface of the organic wavelength conversion layer 140 are shown in FIG. 4 .

Wherein, the first optical film 120 arranged on the other surface of the inorganic wavelength conversion layer 130 is used to transmit the excitation light λ ₀ and reflect the first stimulated light λ ₁ ; The second optical film 150 is used for reflecting the first received light λ ₁ and transmitting the second received light λ ₂ , or at least for reflecting the second received light λ ₂ .

When the second received light is red received light, the inorganic bonding material forming the inorganic wavelength conversion layer 130 is glass powder, and the first wavelength conversion material is yellow YAG (Yttrium Aluminum Garnet, yttrium aluminum garnet) phosphor, forming an organic wavelength conversion layer 130. The organic bonding material of the conversion layer 140 is high-transmittance silica gel or epoxy resin, and its transmittance to visible light is more than 90% per 2mm depth, and the second wavelength conversion material is red phosphor powder. At this time, the excitation light λ ₀ is the blue excitation light, and the first subject light λ ₁ is the yellow subject light. In this embodiment, the glass powder is a glass powder with high light transmittance and high temperature resistance, which can be borosilicate glass powder, borophosphate glass powder, silicate glass powder, phosphate glass powder, zinc phosphate glass pink.

Among them, the wavelength range of the blue excitation light is 430nm-480nm, preferably 445nm-455nm; the first optical film 120 is a blue light angle modification film, the material is sapphire, its 120a surface has no coating, and the 120b surface is coated with a blue light angle modification film , the blue light angle modification film only allows blue light with a small angle to pass through, and the blue light with a larger angle will be reflected; the second optical film 150 is a red light color modification film, its 150b surface has no coating, and the 150a surface is coated with red light Modified film, the red light modified film only allows the light in the red band to pass through, and the light in the non-red band will be reflected.

As shown in FIG. 4 , the process of forming the red stimulated light is: the blue excited light is collimated and incident on the surface 120a of the first optical film 120, passes through the first optical film 120, and then enters the inorganic wavelength conversion layer 130 to excite The yellow fluorescent powder in the inorganic wavelength conversion layer 130 produces yellow received light. Among them, part of the blue light incident on the inorganic wavelength conversion layer 130 will be diffusely reflected to the 120b surface, but the blue light with a larger angle will be reflected back to the inorganic wavelength conversion layer 130. In the wavelength conversion layer 130, the yellow phosphor is excited to generate yellow light; then the yellow light is incident on the organic wavelength conversion layer 140, and the red phosphor is excited to generate red light, which is incident on the second optical film The 150a surface of the sheet 150, because the 150a surface of the second optical film 150 will receive the red stimulated light and the yellow light that does not participate in the excitation, and the yellow light will be reflected by the 150a surface back into the organic wavelength conversion layer 140, therefore, through the second optical film 150 The light on the surface 150b of the diaphragm 150 is red light.

In the wavelength conversion device provided in this embodiment, after the inorganic wavelength conversion layer absorbs the excitation light and generates the first received light, the organic wavelength conversion layer absorbs the first received light and generates the second received light. The conversion efficiency of the wavelength conversion material is higher than that of the second wavelength conversion material in the organic wavelength conversion layer. Therefore, compared with the way that the second wavelength conversion material directly absorbs the excitation light to generate the second received light, the inorganic wavelength conversion layer in the present invention The heat generated by the organic wavelength conversion layer and the organic wavelength conversion layer is less, the temperature of the wavelength conversion device is lower, and the light efficiency of the second received light is higher.

Moreover, since the organic wavelength conversion layer is bonded to the inorganic wavelength conversion layer, and the thermal conductivity of the organic wavelength conversion layer is better, the heat in the inorganic wavelength conversion layer can be dissipated quickly, thereby effectively reducing the wavelength conversion. The temperature of the device improves the performance of products such as lighting devices and projection systems. In addition, the inorganic wavelength conversion layer is used as a layer for absorbing excitation light, and the inorganic binder therein has better high temperature resistance performance than the organic binder in the organic wavelength conversion layer, which can prevent damage to the organic wavelength conversion layer due to high temperature. Thus, the lifetime of the light emitting device is improved.

Embodiment two

This embodiment provides a method for preparing a wavelength conversion device, the flow chart of which is shown in Figure 5, including:

S501: Prepare an inorganic wavelength conversion layer by using an inorganic bonding material and a first wavelength conversion material;

In this embodiment, the first wavelength conversion material is yellow fluorescent powder, and the inorganic bonding material is glass frit.

The process of forming the inorganic wavelength conversion layer is: mixing an appropriate amount of yellow fluorescent powder and high transmittance borosilicate glass powder. The mass percent of powder and glass powder is 77%: 23%, then add organic carrier and make slurry in the yellow fluorescent powder after mixing and glass powder, wherein, the quality of organic carrier and the phosphor powder after mixing and glass powder The percentages are 15%:85%. The prepared slurry is placed in a ball mill jar and milled with high-purity zirconia balls at a low speed for 4 hours to obtain fluorescent glass slurry. In other embodiments, the mass percentage of phosphor powder and glass powder can also be (30%-80%): (20%-70%), and the mass percentage of organic vehicle and mixed phosphor powder and glass powder can also be (10%～30%): (70%～90%).

Then, the phosphor powder slurry is coated on the release substrate by screen printing or direct scrape coating. Bake for 10-15 minutes, and then put it into a muffle furnace for sintering after molding. The temperature program for sintering includes a debinding program for 0.5-1.5 hours at a temperature of 400°C-450°C to completely volatilize the organic carrier; It also includes the procedure of holding at the glass phase transition temperature for 20min to 40min, and at the glass softening temperature for 20min to 40min to soften the glass phase slowly, and then sintering at 800°C to 860°C for 20min to 40min to obtain a smooth, non-porous The shrinkage thickness of the solid and firmly bonded luminescent glass layer is controlled at 90 μm to 110 μm, and thus the inorganic wavelength conversion layer is prepared.

After the inorganic wavelength conversion layer is formed, an organic wavelength conversion layer needs to be formed on one surface of the inorganic wavelength conversion layer, wherein the organic wavelength conversion layer includes an organic bonding material and a second wavelength conversion material.

S502: Form an organic wavelength conversion layer by using an organic bonding material, a second wavelength conversion material and an anti-sedimentation agent;

In this embodiment, the second wavelength conversion material is red phosphor, the organic bonding material is silica gel with high transmittance, the blue light transmittance of the organic bonding material is above 95%, the curing temperature is 160°C, and the curing time is 4 hours. Wherein, the mass percentages of red fluorescent powder, silica gel and anti-settling agent are 48%: 43%: 9%. In other embodiments, the mass percentages of the second wavelength converting material, the organic bonding material and the anti-settling agent are (30%˜60%):(31%˜61%):9%.

Weigh an appropriate amount of red fluorescent powder, high transmittance silica gel and anti-settling agent, stir at high speed and mix thoroughly to make a slurry, and then defoam in a vacuum defoamer for 30 minutes to obtain phosphor silica gel slurry. A piece of PET (Polyethylene terephthalate, polyethylene terephthalate) film was pasted on the surface of the glass sheet with a high-temperature adhesive tape, and then the prepared fluorescent powder silica gel slurry was scraped or printed on the surface of the PET film by stencil printing. After pre-baking at 150° C. for 10 minutes to 15 minutes, take it out and peel off the formed film layer, that is, the organic wavelength conversion layer is prepared, and the thickness of the film layer is controlled at 60 μm to 70 μm.

S503: Adhering or stacking the organic wavelength conversion layer on a surface of the inorganic wavelength conversion layer.

After the inorganic wavelength conversion layer and the organic wavelength conversion layer are prepared, the organic wavelength conversion layer can be directly stacked on one surface of the inorganic wavelength conversion layer. Since the organic wavelength conversion layer contains silica gel, it also has a certain viscosity. After it is stacked with the inorganic wavelength conversion layer, and then bonded together with the first optical film and the second optical film, the wavelength conversion device is formed.

Of course, in other embodiments of the present invention, the inorganic wavelength conversion layer and the organic wavelength conversion layer can also be pasted in other ways, that is, a layer of silica gel with a thickness of about 20 μm to 30 μm can also be scraped on the surface of the organic wavelength conversion layer. Then paste the inorganic wavelength conversion layer on the silica gel, and cover the surface with a piece of clean paper with a flat surface, press it with a flat glass plate or aluminum plate, and put them together in an oven at 150°C for 15 minutes. After the pre-baking is completed, remove the glass plate or aluminum plate, remove the clean paper, and continue to bake for 3 hours. After the baking is completed, the edge is trimmed, that is, an organic wavelength conversion layer with an inorganic wavelength conversion layer on one surface is obtained. After that, the first optical film and the second optical film are laminated to form a wavelength conversion device.

The preparation method of the wavelength conversion device provided in this embodiment uses the inorganic bonding material and the first wavelength conversion material to prepare the inorganic wavelength conversion layer that absorbs the excitation light and generates the first stimulated light, and uses the organic bonding material and the second wavelength conversion material to form The organic wavelength conversion layer that absorbs the first subject light and generates the second subject light, because the conversion efficiency of the first wavelength conversion material is higher than that of the second wavelength conversion material, therefore, directly absorbs the excitation light with the second wavelength conversion material to generate the second subject Compared with the laser method, the inorganic wavelength conversion layer and the organic wavelength conversion layer produced by the method provided in this embodiment generate less heat, the temperature of the wavelength conversion device is lower, and the light efficiency of the obtained second laser light is higher.

Moreover, since the organic wavelength conversion layer is bonded or stacked with the inorganic wavelength conversion layer, and the thermal conductivity of the organic wavelength conversion layer is better, the heat in the inorganic wavelength conversion layer can be dissipated quickly, thereby effectively reducing the wavelength. Convert the temperature of the device to improve the performance of products such as lighting devices and projection systems. In addition, the inorganic wavelength conversion layer is used as a layer for absorbing excitation light, and the inorganic binder therein has better high temperature resistance performance than the organic binder in the organic wavelength conversion layer, which can prevent damage to the organic wavelength conversion layer due to high temperature. Thus, the lifetime of the light emitting device is improved.

Embodiment Three

This embodiment provides a method for preparing a wavelength conversion device, the flow chart of which is shown in Figure 6, including:

S601: Prepare an inorganic wavelength conversion layer by using an inorganic bonding material and a first wavelength conversion material;

In this embodiment, the first wavelength conversion material is yellow fluorescent powder, and the inorganic bonding material is glass frit. Moreover, the process of preparing the inorganic wavelength conversion layer is the same as the process of preparing the inorganic wavelength conversion layer in Embodiment 2, and will not be repeated here. The difference lies in the formation process of the organic wavelength conversion layer.

S602: Form an organic wavelength conversion layer on a surface of the inorganic wavelength conversion layer by means of precipitation deposition.

In this embodiment, the organic wavelength conversion layer is formed of an organic bonding material and a second wavelength converting material, the second wavelength converting material is red phosphor, and the organic bonding material is a hydrolyzed solution of a silane coupling agent.

The process of preparing the silane coupling agent hydrolysis solution is as follows: add 70 g of deionized water into a three-neck round bottom flask with a capacity of 250 ml, then add an appropriate amount of 40% acetic acid solution, and adjust the pH value of the solution to 5. Weigh 4.5g of KH560 and dissolve it in 23ml of absolute ethanol, drop in 2g of deionized water for pre-hydrolysis after stirring, then slowly drop the solution into a rapidly stirring three-neck round bottom flask, react for 3 hours, wait The mixed solution is clear and transparent to obtain the required hydrolysis solution of the silane coupling agent.

In this embodiment, the process of preparing the organic wavelength conversion layer is as follows: placing the prepared inorganic wavelength conversion layer on the surface of the supporting fixture, requiring the surface of the inorganic wavelength converting layer to be closely attached and fixed to the surface of the carrying fixture, and then placing it At the bottom of the cylindrical container. Measure the circular area S _bottom in the bottom of the cylindrical container, the density ρ _powder of the red phosphor is known, the thickness of the organic wavelength conversion layer to be prepared is d _powder , then the mass m _powder of the red phosphor powder=ρ _powder *S needs to be added _Bottom *d _powder (1).

Add a certain amount of red fluorescent powder calculated according to the formula (1) into the prepared silane coupling agent hydrolysis solution, stir and disperse, and then ultrasonically disperse. After the solution is uniformly mixed, immediately pour it into the bottom and place it with In the cylindrical container of the inorganic wavelength conversion layer, place it still, wait until the red phosphor in the solution is completely precipitated, and when the upper layer solution is a colorless and transparent liquid, slowly pump away the upper layer solution, and then place the cylindrical container at temperature Bake in an oven at 120°C for 2 hours. After the baking is completed, an organic wavelength conversion layer with an inorganic wavelength conversion layer on the surface is obtained, and then bonded with the first optical film and the second optical film to form a wavelength conversion device.

The preparation method of the wavelength conversion device provided in this embodiment uses an inorganic bonding material and a first wavelength conversion material to form an inorganic wavelength conversion layer that absorbs excitation light and generates the first stimulated light, and uses an organic bonding material and a second wavelength conversion material to form The organic wavelength conversion layer that absorbs the first subject light and generates the second subject light, because the conversion efficiency of the first wavelength conversion material is higher than that of the second wavelength conversion material, therefore, directly absorbs the excitation light with the second wavelength conversion material to generate the second subject Compared with the laser method, the inorganic wavelength conversion layer and the organic wavelength conversion layer produced by the method provided in this embodiment generate less heat, the temperature of the wavelength conversion device is lower, and the light efficiency of the obtained second laser light is higher.

Moreover, since the organic wavelength conversion layer and the inorganic wavelength conversion layer are bonded and connected by precipitation, and the thermal conductivity of the organic wavelength conversion layer is better, the heat in the inorganic wavelength conversion layer can be dissipated quickly, thereby The temperature of the wavelength conversion device can be effectively reduced, and the performance of products such as light emitting devices and projection systems can be improved. In addition, the inorganic wavelength conversion layer is used as a layer for absorbing excitation light, and the inorganic binder therein has better high temperature resistance performance than the organic binder in the organic wavelength conversion layer, which can prevent damage to the organic wavelength conversion layer due to high temperature. Thus, the lifetime of the light emitting device is improved.

Embodiment Four

This embodiment provides a light emitting device including the wavelength conversion device provided in Embodiment 1, and a projection system including the light emitting device. The light emitting device and the projection system provided in this embodiment have good light efficiency, less heat generation, low temperature, long service life and better performance.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (12)

1. A kind of 1. Wavelength converter, it is characterised in that including：

   Inorganic wavelength conversion layer comprising inorganic cementitious material and first wave length transition material, for absorbing exciting light and producing the One stimulated light；

   Organic wavelength conversion layer on one surface of inorganic wavelength conversion layer is stacked and placed on, organic wavelength conversion layer includes organic Binding material and second wave length transition material, for absorbing first stimulated light and producing the second stimulated light；

   Organic wavelength conversion layer is bonded connection with the inorganic wavelength conversion layer.
2. 2. Wavelength converter according to claim 1, it is characterised in that the second wave length transition material is additionally operable to inhale Receive exciting light and produce the 3rd stimulated light.
3. 3. Wavelength converter according to claim 1, it is characterised in that further include：

   The first optical diaphragm positioned at surface of the inorganic wavelength conversion layer away from organic wavelength conversion layer, for transmiting The exciting light simultaneously reflects first stimulated light.
4. 4. Wavelength converter according to claim 1, it is characterised in that further include：

   The second optical diaphragm positioned at surface of the organic wavelength conversion layer away from the inorganic wavelength conversion layer, for reflecting First stimulated light simultaneously transmits second stimulated light, or is at least used to reflect the second stimulated light.
5. 5. Wavelength converter as claimed in any of claims 1 to 4, it is characterised in that the inorganic bond material Expect that for glass dust, the first wave length transition material be yellow fluorescent powder；The organic binding material is silica gel or epoxy resin, The second wave length transition material is red fluorescence powder.
6. 6. Wavelength converter according to claim 5, it is characterised in that the thickness range of the inorganic wavelength conversion layer For 90 μm~110 μm；The thickness range of organic wavelength conversion layer is 60 μm~70 μm.
7. A kind of 7. preparation method of Wavelength converter, it is characterised in that including：

   Step 1：Inorganic wavelength conversion layer is prepared using inorganic cementitious material and first wave length transition material；

   Step 2：Formed on a surface of the inorganic wavelength conversion layer using organic bonding material and second wave length transition material Organic wavelength conversion layer, makes to be bonded connection between organic wavelength conversion layer and inorganic wavelength conversion layer.
8. 8. the method according to the description of claim 7 is characterized in that the process of the step 2 is：

   By the way of precipitation deposits organic wavelength conversion layer is formed on a surface of the inorganic wavelength conversion layer.
9. 9. according to the method described in claim 8, it is characterized in that, the mode of the precipitation deposition is specially：

   The inorganic wavelength conversion layer is placed on inside container；

   The advance prepared silane coupling agent hydrating solution with second wave length transition material is poured into the container；

   After the silane coupling agent hydrating solution precipitation, deposition, organic ripple is formed on a surface of the inorganic wavelength conversion layer Long conversion layer.
10. A kind of 10. Wavelength converter, it is characterised in that including at least the first subregion and the second subregion, wherein, described first point Area includes the inorganic wavelength conversion layer for being stacked and being mutually bonded and organic wavelength conversion layer, the inorganic wavelength conversion layer bag Containing inorganic cementitious material and first wave length transition material, for absorbing exciting light and producing the first stimulated light；Organic wavelength Conversion layer includes organic binding material and second wave length transition material, is excited for absorbing first stimulated light and producing second Light；

    Second subregion includes inorganic cementitious material and the 3rd wavelength conversion material, is different from for absorbing exciting light and producing 3rd stimulated light of the second stimulated light.
11. 11. a kind of light-emitting device, it is characterised in that including claim 1-6 any one of them Wavelength converter or right It is required that the Wavelength converter described in 10.
12. 12. a kind of optical projection system, it is characterised in that including the light-emitting device described in claim 11.