CN100385690C - White light emitting method capable of adjusting color temperature - Google Patents
White light emitting method capable of adjusting color temperature Download PDFInfo
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- CN100385690C CN100385690C CNB2004100633674A CN200410063367A CN100385690C CN 100385690 C CN100385690 C CN 100385690C CN B2004100633674 A CNB2004100633674 A CN B2004100633674A CN 200410063367 A CN200410063367 A CN 200410063367A CN 100385690 C CN100385690 C CN 100385690C
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Abstract
Description
技术领域 technical field
本发明涉及一种可随时调整色温的白光发光方法及装置，尤指应用一可产生蓝光的发光二极管，配合多个可被蓝光激发的荧光材料，先混合成高色温或低色温的白色致发光，然后再利用其它多个发光二极管的致发光予以调整，使其可以随时调整其白色致发光的色温。The present invention relates to a white light emitting method and device capable of adjusting the color temperature at any time, especially the application of a light-emitting diode capable of generating blue light, combined with a plurality of fluorescent materials that can be excited by blue light, and firstly mixed into white light emitting light with high color temperature or low color temperature , and then use the luminescence of other light-emitting diodes to adjust, so that the color temperature of its white luminescence can be adjusted at any time.
背景技术 Background technique
白光是一种多颜色的混合光，可被人眼感觉为白光的至少包括二种以上波长的混合光。例如人眼同时受红、蓝、绿光的刺激时，或同时受到蓝光与黄光的刺激时均可感受为白光，目前常用的光源，一为日光灯，其色温约7500K，二为白炽灯，其色温约3000K，三则为发展中的白光二极管。White light is a multi-color mixed light that can be perceived as white light by the human eye, including at least two or more wavelengths. For example, when the human eye is stimulated by red, blue, and green light at the same time, or when it is stimulated by blue light and yellow light at the same time, it can be perceived as white light. Currently, the commonly used light sources are fluorescent lamps with a color temperature of about 7500K, and incandescent lamps. Its color temperature is about 3000K, and the third is a developing white light diode.
已知的白光二极管制作方法有五种：第一种方法是使用以InGaAIP、GaN与GaN为材质的三颗二极管，分别控制通过二极管的电流而发出红、绿及蓝光，三色混合而产生白光。第二种方法是使用GaN与InGaAIP为材质的二颗二极亦分别控制通过二极管的电流而发出蓝及黄绿光或蓝绿及红光，两色混合而产生白光。第三种方法则是1996年日本日亚化学公司发展出以氮化铟镓蓝光发光二极管，配合发黄光的钇铝石榴石型荧光粉，两色混合而产生白光。There are five known manufacturing methods of white light diodes: the first method is to use three diodes made of InGaAIP, GaN and GaN, respectively control the current passing through the diodes to emit red, green and blue light, and the three colors are mixed to produce white light . The second method is to use two diodes made of GaN and InGaAIP to control the current passing through the diode to emit blue and yellow-green light or blue-green and red light, and the two colors are mixed to produce white light. The third method is that in 1996, Japan's Nichia Chemical Company developed a blue light-emitting diode made of indium gallium nitride, combined with a yellow-emitting yttrium-aluminum-garnet-type phosphor, and the two colors are mixed to produce white light.
第四种方法是日本住友电工在1999年1月研发出使用ZnSe材料的白光二极管，其技术是先在ZnSe单晶基上形成CdZnSe薄膜，通电后薄膜会发出蓝光，同时部分的蓝光照射在基板上而发出黄光，最后蓝、黄光形成互补色而发出白光。第五种方法是紫外光白光二极管，其原理是利用紫外光二极管激发多种的荧光粉发出荧光，经混色后亦可产生白光。The fourth method is that Japan’s Sumitomo Electric developed a white light diode using ZnSe material in January 1999. The technology is to first form a CdZnSe film on a ZnSe single crystal substrate. After powering on, the film will emit blue light, and part of the blue light will shine on the substrate It emits yellow light, and finally blue and yellow light form complementary colors to emit white light. The fifth method is an ultraviolet white light diode. Its principle is to use ultraviolet light diodes to excite various phosphors to emit fluorescence, and white light can also be produced after color mixing.
上述五种方法所产生的白光二极管，除第一种方法与第二种方法外，其余三种方法都只能发出单一固定色温的白光，无法随时调整色温。而第一种方法虽然可以调整三个芯片的电流，以混合出不同色温的白光，可是由于需要个别控制三个芯片的电流，致使控制电路复杂成本较高。而第二种方法亦可调整两个芯片的电流，以混合出不同色温的白光，可是由于仅具有两色光，所以混合出的白光，仅能涵盖部份的色温范围，无法随时混合出常用光源的色温：日光灯的7500K与白炽灯的3000K。Except for the first method and the second method, the white light diodes produced by the above five methods can only emit white light with a single fixed color temperature, and cannot adjust the color temperature at any time. In the first method, although the currents of the three chips can be adjusted to mix white light with different color temperatures, the control circuit is complex and costly due to the need to individually control the currents of the three chips. The second method can also adjust the current of the two chips to mix white light with different color temperatures. However, since there are only two colors of light, the mixed white light can only cover part of the color temperature range, and cannot mix common light sources at any time. Color temperature: 7500K for fluorescent lamps and 3000K for incandescent lamps.
发明内容 Contents of the invention
本发明的目的在于克服上述现有技术的问题而提供一种可调整色温的白光发光方法及装置，可以随时调整其白色致发光的色温。The object of the present invention is to overcome the above-mentioned problems in the prior art and provide a white light emitting method and device with adjustable color temperature, which can adjust the color temperature of white light emission at any time.
本发明的目的可通过如下措施来实现：The purpose of the present invention can be achieved through the following measures:
一种可调整色温的白光发光的方法，包括：产生由一蓝光发光二极管所发出的蓝光，该蓝光发光二极管的波长范围为400nm至500nm；合成多个可被蓝光激发的荧光体，该荧光体的致发光波长范围为540nm至700nm，该荧光体的致发光与该蓝光发光二极管的蓝光，可混合成高于色温6500K的白色致发光，该荧光体为一CaS:Eu或一SrGa2S4:Eu；及加入一橘光发光二极管，该橘光发光二极管的波长范围为540nm至600nm，用以调整该白色致发光为所需要的色温的白光。A method of white light emission with adjustable color temperature, comprising: generating blue light emitted by a blue light emitting diode, the wavelength range of the blue light emitting diode is 400nm to 500nm; synthesizing a plurality of phosphors that can be excited by the blue light, the phosphors The luminescence wavelength range is from 540nm to 700nm. The luminescence of the phosphor and the blue light of the blue light-emitting diode can be mixed into a white luminescence with a color temperature of 6500K. The phosphor is a CaS:Eu or a SrGa 2 S 4 : Eu; and adding an orange light-emitting diode, the wavelength range of the orange light-emitting diode is 540nm to 600nm, which is used to adjust the white luminescence to the white light of the required color temperature.
该蓝光发光二极管的发光层是由氮化物系化合物半导体制成。The light emitting layer of the blue light emitting diode is made of nitride compound semiconductor.
该合成所述荧光体的步骤中，该合成方法可为固态反应法或化学合成法。In the step of synthesizing the phosphor, the synthesis method may be a solid state reaction method or a chemical synthesis method.
该化学合成法进一步可为柠檬酸凝胶法或一共沉淀法。The chemical synthesis method can further be a citric acid gel method or a co-precipitation method.
该橘光发光二极管的发光层是由氮化物系化合物半导体或磷化物系化合物半导体制成。The light emitting layer of the orange light emitting diode is made of nitride compound semiconductor or phosphide compound semiconductor.
该橘光发光二极管可以调整该白光光强及调变色温。The orange light-emitting diode can adjust the light intensity and color temperature of the white light.
该橘光发光二极管施以适当的电流，即可获得所要调变的色温。Appropriate current is applied to the orange light-emitting diode, and the desired modulated color temperature can be obtained.
该调变的色温介于2000K至20000K之间。The color temperature of this modulation is between 2000K and 20000K.
一种可调整色温的白光发光的方法，包括：产生由一蓝光发光二极管所发出的蓝光，该蓝光发光二极管的波长范围为400nm至500nm；合成多个可被蓝光激发的荧光体，该荧光体的致发光波长范围为540nm至700nm，该荧光体的致发光与该蓝光发光二极管的蓝光，可混合成低于色温6500K的白色致发光，该荧光体为一CaS:Eu或一SrGa2S4:Eu；及加入另一蓝绿光发光二极管，该蓝绿光发光二极管的波长范围为480nm至500nm，用以调整该白色致发光为所需要的色温的白光。A method of white light emission with adjustable color temperature, comprising: generating blue light emitted by a blue light emitting diode, the wavelength range of the blue light emitting diode is 400nm to 500nm; synthesizing a plurality of phosphors that can be excited by the blue light, the phosphors The luminescence wavelength range is from 540nm to 700nm. The luminescence of the phosphor and the blue light of the blue light-emitting diode can be mixed into a white luminescence with a color temperature of 6500K. The phosphor is a CaS:Eu or a SrGa 2 S 4 : Eu; and adding another blue-green light-emitting diode, the wavelength range of the blue-green light-emitting diode is 480nm to 500nm, which is used to adjust the white luminescence to the white light of the required color temperature.
该蓝光发光二极管的发光层是由氮化物系化合物半导体制成。The light emitting layer of the blue light emitting diode is made of nitride compound semiconductor.
该合成所述荧光体的步骤中，该合成方法为固态反应法或化学合成法。In the step of synthesizing the phosphor, the synthesis method is a solid state reaction method or a chemical synthesis method.
该化学合成法进一步为柠檬酸凝胶法或一共沉淀法。The chemical synthesis method is further a citric acid gel method or a co-precipitation method.
该蓝绿光发光二极管的发光层是由氮化物系化合物半导体或磷化物系化合物半导体制成。The light-emitting layer of the blue-green light-emitting diode is made of nitride-based compound semiconductor or phosphide-based compound semiconductor.
该蓝绿光发光二极管可以调整该白光光强及调变色温。The blue-green light emitting diode can adjust the light intensity and color temperature of the white light.
该蓝绿光发光二极管施以适当的电流，即可获得所要调变的色温。Appropriate current is applied to the blue-green light-emitting diode, and the desired modulated color temperature can be obtained.
该调变的色温介于2000K至20000K之间。The color temperature of this modulation is between 2000K and 20000K.
一种可调整色温的白光发光的装置，包括：一第一发光元件，为一可发出蓝光的蓝光发光二极管，该蓝光二极管的波长为400nm至500nm；一第二发光元件，为多个光致发光体，用以导引该第一发光元件将其发出高色温或低色温的白色致发光，所述光致发光体的波长为540nm至700nm，所述光致发光体可为一CaS:Eu或一SrGa2S4:Eu；及一第三发光元件，为一发光二极管，该发光二极管的波长范围为480nm至600nm，用以调整该白光为所需要的色温的白光。A device for emitting white light with adjustable color temperature, comprising: a first light-emitting element, which is a blue light-emitting diode capable of emitting blue light, and the wavelength of the blue light-emitting diode is 400nm to 500nm; a second light-emitting element, which is a plurality of photosensitive A luminescent body, used to guide the first light-emitting element to emit white luminescence with a high color temperature or a low color temperature, the wavelength of the photoluminescent body is 540nm to 700nm, and the photoluminescent body can be a CaS:Eu or a SrGa 2 S 4 :Eu; and a third light-emitting element, which is a light-emitting diode, and the wavelength range of the light-emitting diode is 480nm to 600nm, which is used to adjust the white light to a white light with a required color temperature.
该蓝光二极管的发光层是由氮化物系化合物半导体制成。The light emitting layer of the blue light diode is made of nitride compound semiconductor.
该第三发光元件是用以调整该白光光强及调变色温。The third light-emitting element is used to adjust the intensity and color temperature of the white light.
该第三发光元件施以适当的电流，即可获得所要调变的色温。Appropriate current is applied to the third light-emitting element to obtain the desired modulated color temperature.
该调变的色温介于2000K至20000K之间。The color temperature of this modulation is between 2000K and 20000K.
该第三发光元件的发光层是由氮化物系化合物半导体或磷化物系化合物半导体制成。The light-emitting layer of the third light-emitting element is made of a nitride-based compound semiconductor or a phosphide-based compound semiconductor.
本发明提供一种可随時调整色温的白光发光方法，是应用一可产生蓝光的发光二极管，配合多个可被蓝光激发的荧光材料，先混合成高色温或低色温的白色致发光，然后再利用其它多个发光二极管的致发光予以调整，使其可以随时调整其白色致发光的色温。The invention provides a white light emitting method that can adjust the color temperature at any time. It uses a light-emitting diode that can generate blue light, and cooperates with a plurality of fluorescent materials that can be excited by blue light. The luminescence of other multiple light-emitting diodes is used for adjustment, so that the color temperature of its white luminescence can be adjusted at any time.
本发明还提供一种可随时调整色温的白光发光装置，该装置包括一第一发光元件；一第二发光元件，用以导引该第一发光元件将其发出白光；及一第三发光元件，控制该第三发光元件的电流用以随时调整该白光为所需要之色温的白光。The present invention also provides a white light emitting device capable of adjusting color temperature at any time, the device includes a first light emitting element; a second light emitting element, used to guide the first light emitting element to emit white light; and a third light emitting element , controlling the current of the third light-emitting element to adjust the white light to the white light with the required color temperature at any time.
附图说明 Description of drawings
图1为蓝光发光二极管的发射光谱；Fig. 1 is the emission spectrum of blue light-emitting diode;
图2为本发明的色度坐标图；Fig. 2 is a chromaticity coordinate diagram of the present invention;
图3为最佳实施例的高色温的白光发射光谱；Fig. 3 is the white light emission spectrum of the high color temperature of the preferred embodiment;
图4为橘光发光二极管的发射光谱；及FIG. 4 is an emission spectrum of an orange light-emitting diode; and
图5为最佳实施例的低色温的白光发射光谱。Fig. 5 is the emission spectrum of white light with low color temperature of the preferred embodiment.
其中，附图标记说明如下：Wherein, the reference signs are explained as follows:
10-对应蓝色发光二极管的色度坐标；10 - the chromaticity coordinates corresponding to the blue light-emitting diode;
12-对应多个黄色荧光粉的色度坐标；12 - chromaticity coordinates corresponding to multiple yellow phosphors;
14-混合光； 16-对应橘光发光二极管的色度坐标；14-mixed light; 16-corresponding to the chromaticity coordinates of orange light-emitting diodes;
18-黑体辐射(色温曲线)。18 - Black body radiation (color temperature curve).
具体实施方式 Detailed ways
本发明的可调整色温的白光发光的方法，包括应用一可产生蓝光的发光二极管，合成多个可被蓝光激发的荧光体，先混合成高色温或低色温的白色致发光，然后再利用其它多个发光二极管的致发光予以调整，使其可以随时调整其白色致发光的色温；该蓝光二极管的发光层由氮化物系化合物半导体制成，该蓝光二极管的波长为400nm至500nm；该荧光体为一Y3Al5O12:Ce，Gd、-CaS:Eu或一SrGa2S4:Eu，该荧光体的致发光体波长为540nm至700nm，该合成方法可为固态反应法或化学合成法，该化学合成法进一步可为柠檬酸凝胶法或一共沉淀法；调色的发光二极管的发光层由氮化物系化合物半导体或磷化物系化合物半导体制成，该调色发光二极管的波长为480nm至600nm，其中该调色发光二极管可为蓝绿光二极管或橘光二极管，以下所提及的实施例仅举其一作说明，但不限于此。The white light emission method with adjustable color temperature of the present invention includes applying a light-emitting diode capable of generating blue light, synthesizing a plurality of phosphors that can be excited by blue light, first mixing them into white luminescence with high color temperature or low color temperature, and then using other The luminescence of multiple light-emitting diodes is adjusted so that the color temperature of their white luminescence can be adjusted at any time; the light-emitting layer of the blue light diode is made of nitride-based compound semiconductors, and the wavelength of the blue light diode is 400nm to 500nm; the phosphor It is a Y 3 Al 5 O 12 :Ce, Gd, -CaS:Eu or a SrGa 2 S 4 :Eu, the luminescent wavelength of the phosphor is 540nm to 700nm, and the synthesis method can be solid state reaction method or chemical synthesis method, the chemical synthesis method can further be a citric acid gel method or a co-precipitation method; the light-emitting layer of the light-emitting diode toned is made of a nitride-based compound semiconductor or a phosphide-based compound semiconductor, and the wavelength of the toned light-emitting diode is 480nm to 600nm, wherein the color-tuned light-emitting diode can be blue-green light-emitting diode or orange light-emitting diode, the embodiment mentioned below is just one of them for illustration, but not limited thereto.
本发明的可调整色温的白光发光的装置，包括一第一发光元件，其中该第一发光元件为一发光二极管，该发光二极管为一可发出蓝光的蓝光二极管，该蓝光二极管的发光层由氮化物系化合物半导体制成，该蓝光二极管需施以电流(例如30mA)，可发出蓝色光线，实施例采用的蓝光发光二极管波长为480nm；一第二发光元件，用以导引该第一发光元件混合发出白光，实施例中的白光色温为7500K。The white light emitting device with adjustable color temperature of the present invention comprises a first light-emitting element, wherein the first light-emitting element is a light-emitting diode, and the light-emitting diode is a blue light-emitting diode capable of emitting blue light. The light-emitting layer of the blue light-emitting diode is made of nitrogen The blue light emitting diode is made of chemical compound semiconductor. The blue light emitting diode needs to be supplied with a current (such as 30mA) to emit blue light. The wavelength of the blue light emitting diode used in the embodiment is 480nm; a second light emitting element is used to guide the first light emitting The components mix and emit white light, and the color temperature of the white light in the embodiment is 7500K.
该第二发光元件为多个光致发光体，实施例采用的光致发光体为可发出黄光的光致发光体，所述光致发光体含有自Y，Tb，La，Gd，Pr与Sm一组中所选出的至少一元素或自Al，Ga，In与Fe一组所选出的至少一元素来与Ce致活；及一第三发光元件，用以调整该白光为所需要的色温的白光，其中该第三发光元件为一发光二极管，该第三发光元件可为一可发出橘光的发光二极管，该橘光发光二极管的波长为592nm。The second light-emitting element is a plurality of photoluminescent bodies. The photoluminescent body used in the embodiment is a photoluminescent body that can emit yellow light. The photoluminescent body contains Y, Tb, La, Gd, Pr and At least one element selected from the group of Sm or at least one element selected from the group of Al, Ga, In and Fe to activate Ce; and a third light-emitting element for adjusting the white light as required The color temperature of white light, wherein the third light-emitting element is a light-emitting diode, the third light-emitting element can be a light-emitting diode that can emit orange light, and the wavelength of the orange light-emitting diode is 592nm.
该橘黄光二极管需施以电流(例如30mA)，可发出橘色光线，该第三发光元件可用以调整该白光光强及调变色温，该第三发光元件施以适当的电流，即可获得所要调变的色温，该色温调变介于2000K至20000K之间(例如该色温调变介于3000K至7500K之间)，该第三发光元件的发光层由氮化物系化合物半导体或磷化物系化合物半导体制成。The orange light diode needs to be supplied with a current (for example, 30mA) to emit orange light. The third light-emitting element can be used to adjust the light intensity and color temperature of the white light. The third light-emitting element can be obtained by applying an appropriate current. The color temperature to be adjusted, the color temperature adjustment is between 2000K to 20000K (for example, the color temperature adjustment is between 3000K to 7500K), the light emitting layer of the third light emitting element is made of nitride compound semiconductor or phosphide system made of compound semiconductors.
请参见图1为蓝光发光二极管的发射光谱，由此发射光谱可知该蓝光发光二极管波长为430nm至530nm范围，其中在480nm有最高反射光强度为1。Please refer to FIG. 1 which is the emission spectrum of the blue light emitting diode. From the emission spectrum, it can be seen that the wavelength of the blue light emitting diode is in the range of 430nm to 530nm, and the highest reflected light intensity is 1 at 480nm.
请参见图2为本发明的色度坐标图，其由色度坐标10对应的蓝光发光二极管为一主发光元件，由色度坐标12对应的多个黄色荧光粉吸收蓝光的发光二极管所发出光的一部份，而发出一波长与所吸收的光波长相异的光14。其白光的色温为7500K。另掺杂一调色的由色度坐标16对应的橘光发光二极管，该橘光发光二极管的波长为592nm。对该橘光发光二极管施以不同电流所得的光源的光色变化亦符合大概沿着一黑体辐射线18的色光混合理论连线。Please refer to Fig. 2 for the chromaticity coordinate diagram of the present invention, which is a main light-emitting element by the blue light-emitting diode corresponding to the chromaticity coordinate 10, and emits light by a plurality of yellow phosphors corresponding to the chromaticity coordinate 12 to absorb the blue light. A part of the light source emits light 14 having a wavelength different from that of the absorbed light. Its white light has a color temperature of 7500K. In addition, an orange light-emitting diode corresponding to chromaticity coordinate 16 is doped with a color tone, and the wavelength of the orange light-emitting diode is 592 nm. The light color change of the light source obtained by applying different currents to the orange light-emitting diode also conforms to the theoretical connection of color light mixing along a black
请参见图3，为最佳实施例的高色温的白光发射光谱，此为蓝光发光二极管加入多个黄色荧光粉的发射光谱。请参见图4为橘光发光二极管的发射光谱，其最高发射光的波长范围为530nm至630nm，其反射光强度为1.20E-05至1.40E-05之间。Please refer to FIG. 3 , which is the emission spectrum of white light with high color temperature in the best embodiment, which is the emission spectrum of a blue light-emitting diode added with multiple yellow phosphors. Please refer to FIG. 4 which is the emission spectrum of the orange light-emitting diode. The wavelength range of the highest emitted light is 530nm to 630nm, and the reflected light intensity is between 1.20E-05 and 1.40E-05.
请参见图5为最佳实施例的低色温的白光发射光谱，其包括一蓝光发光二极管，多个黄色荧光粉及加入一橘光发光二极管所产生的发射光谱。Please refer to FIG. 5 which is the low color temperature white light emission spectrum of the preferred embodiment, which includes a blue light-emitting diode, a plurality of yellow phosphors and an emission spectrum generated by adding an orange light-emitting diode.
本发明的白光发光装置具有下列几项优点：The white light emitting device of the present invention has the following advantages:
1.本发明的白光发光装置，随时可以调整致发白光的色温，例如：日光灯的7500K与白炽灯的3000K，亦即同一发光发置内，同时兼具常用光源的色温：日光灯与白炽灯的颜色。1. The white light emitting device of the present invention can adjust the color temperature of white light at any time, for example: 7500K for fluorescent lamps and 3000K for incandescent lamps, that is, in the same light emitting device, it also has the color temperature of common light sources: the color temperature of fluorescent lamps and incandescent lamps color.
2.只需要控制单一芯片的电流，就能调整致发白光的色温，所以控制电路简单制作成本较低，极具产业应用的价值。2. It only needs to control the current of a single chip to adjust the color temperature of the white light, so the control circuit is simple and the production cost is low, which is very valuable for industrial applications.
3.所使用的荧光材料为晶体结构，同时兼具荧光粉与散光粉作用，可以改善致发白光的均匀性。3. The fluorescent material used is a crystal structure, and it also has the functions of fluorescent powder and scattering powder, which can improve the uniformity of white light emission.
本发明确能由上述所揭露的技术，提供一种迥然不同于公知技术的设计，能提高整体的使用价值，且申请前未见于刊物或公开使用。The present invention clearly provides a design that is completely different from the known technology based on the technology disclosed above, which can improve the overall use value, and has not been seen in publications or publicly used before the application.
本发明所述的实施例仅为一具体实施例，但本发明的要旨并不局限于此。任何应用蓝光的发光二极管，配合一种或以上可被蓝光激发的荧光材料，先混合成高色温或低色温的白光致发光，然后再利用其它一种或以上的发光二极管的可见致发光予以调整，以制造一可随时调整色温的白光发光装置的变化或修饰，皆被涵盖在本发明的专利范围内。The embodiment described in the present invention is only a specific embodiment, but the gist of the present invention is not limited thereto. Any light-emitting diode that uses blue light, with one or more fluorescent materials that can be excited by blue light, is first mixed into white photoluminescence with high color temperature or low color temperature, and then adjusted by the visible light-emitting luminescence of other one or more light-emitting diodes , to manufacture a change or modification of a white light emitting device that can adjust the color temperature at any time, all are covered by the patent scope of the present invention.
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