JP2015133221A - Illumination device - Google Patents

Abstract

To provide an illumination device that aims to improve the light extraction efficiency at the time of lighting while improving the light extraction efficiency of afterglow at the time of lighting off.
An illumination device according to the present invention is disposed so as to be separated from a light emitting device including a light emitting element, a wavelength conversion member excited by light emitted from the light emitting element, and the light emitting device. And a translucent cover 4 in which the phosphorescent phosphor 3 is contained.
[Selection] Figure 1

Description

  The present invention relates to an illumination device including a light emitting element.

Conventionally, fluorescent lamps, incandescent bulbs, halogen bulbs, and the like have been used as light sources for lighting fixtures. In recent years, lighting devices including semiconductor light-emitting elements have been studied as light sources to replace these light sources. Furthermore, in such an illuminating device, there is known an illuminating device including a phosphorescent material that retains afterglow for a certain period of time even in a situation where electricity cannot be supplied during a disaster or a power failure.
A phosphorescent material has the property of having afterglow for a relatively long time in a dark place when irradiated with sunlight or artificial illumination light. The lighting device provided with the phosphorescent material can absorb light energy from the lighting device at the time of lighting, and can emit light as afterglow for a certain period of time even after the light is turned off.

For example, as a phosphorescent illumination device, Patent Document 1 (see paragraph 0023, FIG. 5) discloses an illumination device in which a phosphorescent material is mixed with a sealing member that is filled in a storage portion of a light emitting device.
Patent Document 2 (see paragraph 0028, FIG. 1) discloses an illumination device in which a phosphorescent sheet is attached to the inner surface of a sealed outer case.

JP2013-69881A JP2013-218828

  However, in the illuminating device described in Patent Document 1, the phosphorescent material is provided in the housing portion of the light emitting device, and the portion where the afterglow can be seen is a narrow region of the light emitting device unit. Therefore, there is a problem that it is difficult to visually recognize afterglow when viewed through the translucent cover. In addition, since the phosphorescent material is vulnerable to heat, there is a problem that when the phosphorescent material is provided around a light emitting element that generates a large amount of heat as in Patent Document 1, the phosphorescent material is easily deteriorated by heat from the light emitting element.

  The lighting device described in Patent Document 2 has a problem that the efficiency of extracting light from the portion where the sheet is pasted during normal lighting is reduced because the phosphorescent sheet is stuck to the outer case. Further, there is a problem that the adhesive between the phosphorescent sheet and the lighting cover is easily deteriorated by heat from the light emitting device, and it is difficult to make a high quality lighting device. Further, when the sheet-like phosphorescent sheet is attached to the arc-shaped cover, it is difficult to apply the sheet-like phosphorescent sheet uniformly, which becomes a factor that hinders work efficiency.

  The present invention has been made in view of such a problem, and an object thereof is to provide an illuminating device capable of improving the light extraction efficiency even during lighting while improving the light extraction efficiency of afterglow during light extinction. To do.

  In order to achieve the above-described object, an illumination device according to the present invention is disposed so as to be separated from a light-emitting device including a light-emitting element, a wavelength conversion member excited by light emitted from the light-emitting element, and the light-emitting device. And a translucent cover containing a phosphorescent phosphor.

  According to the first aspect of the present invention, it is possible to improve afterglow light extraction efficiency by including the phosphorescent phosphor in the translucent cover.

(A) is the front view of the illuminating device in embodiment which concerns on this invention, (b) is the top view which looked at the illuminating device in embodiment which concerns on this invention from the upper side, (c) is in embodiment which concerns on this invention ( It is sectional drawing in line AA 'of b). It is sectional drawing of the light-emitting device which concerns on this invention. (A) is a schematic diagram of the straight tube | pipe type illumination which applied this invention in embodiment which concerns on this invention, (b) is a schematic diagram of the straight tube | pipe type illumination to which this invention in embodiment which concerns on this invention is applied. (A) is a schematic diagram of the downlight illumination which applied this invention in embodiment which concerns on this invention, (b) is a schematic diagram of the downlight illumination which applied this invention in embodiment which concerns on this invention. (A) is a front view of the lighting device in the embodiment according to the present invention, (b) is a schematic cross-sectional view of (a) in the embodiment according to the present invention, and (c) is the lighting device in the embodiment according to the present invention. A front view and (d) are typical sectional views of (c) in an embodiment concerning the present invention. (A) is the schematic diagram showing the mounting substrate and light-emitting device in embodiment which concerns on this invention, (b) is a schematic cross section in line A-A 'of (a) in embodiment which concerns on this invention. (A) is the front view of the illuminating device in embodiment which concerns on this invention, (b) is the top view which looked at the illuminating device in embodiment which concerns on this invention from the upper side, (c) is in embodiment which concerns on this invention ( It is sectional drawing in line AA 'of b).

  Embodiments of the present invention will be described below with reference to the drawings as appropriate. However, the form shown below illustrates the illuminating device for actualizing the technical idea of this invention, and this invention is not limited to the following.

(First embodiment)
With reference to FIG. 1, the structure of the illuminating device 100 which concerns on 1st embodiment of this invention is demonstrated. As shown in FIG. 1, an illumination device 100 according to the first embodiment includes a light emitting device 10 including a semiconductor light emitting element (hereinafter simply referred to as “light emitting element 1”), and a wavelength conversion member 2 provided in the light emitting device 10. And a translucent cover 4 containing the phosphorescent phosphor 3.

(Light emitting device)
The light emitting device 10 is mounted on a mounting substrate 11 in the lighting device 100 and includes at least one light emitting element 1. In FIG. 2, the light-emitting device 10 includes at least one light-emitting element 1 and a wavelength conversion member 2 that is excited by light emitted from the light-emitting element 1. However, since the wavelength conversion member 2 can be provided in addition to the light emitting device 10 as will be described later, the light emitting device 10 is not necessarily provided with the wavelength conversion member 2. One light emitting device 10 may be placed on the mounting substrate 11, or a plurality of light emitting devices 10 may be placed as shown in FIG. Similarly, the light emitting device 10 provided in the light emitting device 10 may be one or a plurality of light emitting elements 1 may be mounted. When the plurality of light emitting devices 10 or the light emitting elements 1 are provided as described above, it is preferable that the light emitting devices 10 or the light emitting elements 1 are arranged substantially symmetrically on the mounting substrate 11 or in the light emitting device 10. This is because by arranging in this way, uneven light distribution of the illumination device 100 can be reduced.

  The light emitting device 10 preferably has a structure in which the light distribution when observed from the light emitting surface side is substantially Lambertian distributed light distribution. Thereby, it can be set as the illuminating device 100 with little brightness nonuniformity, high efficiency, and reduced glare (glare) which causes discomfort and difficulty in seeing an object. However, the light emitting device 10 is not particularly limited as long as it emits light suitable for the purpose of use of the lighting device 100.

(Mounting board)
The mounting substrate 11 is provided in the lighting device 100 and includes the light emitting device 10 on the upper surface. The shape of the mounting substrate 11 may be not only a quadrangular shape in a plan view but also a circular shape or other polygonal shapes as shown in FIG. The mounting substrate 11 can mount not only the light emitting device 10 but also other circuit components. For example, a capacitor or the like may be mounted to prevent the light emitting device 10 from being erroneously turned on due to noise superimposed on the lighting circuit, or a Zener diode or the like may be mounted to protect the light emitting device 10 from an excessive voltage. I can do it.

(Light emitting element)
The light emitting element 1 is provided in the light emitting device 10. The light-emitting element 1 includes at least a light-emitting layer, and more preferably includes a semiconductor stacked structure in which a first conductive semiconductor, a light-emitting layer, and a second conductive semiconductor are formed in this order, and supplies current to the semiconductor stacked structure. The semiconductor light emitting device 1 has a structure in which an electrode is provided. For example, using a GaN-based compound semiconductor that is a nitride semiconductor, an n-type semiconductor layer having a thickness of about 1 to 2 μm, a light emitting layer having a thickness of about 50 to 150 nm, and a thickness of about 100 to 300 nm on a sapphire substrate. The semiconductor light emitting device 1 structure for forming the p-type semiconductor layer can be obtained.

  The light emitting element 1 should just be what can excite the wavelength conversion member 2 efficiently. The light emitting element 1 desirably has an emission spectrum in which the emission peak wavelength of the emitted light is in the vicinity of 240 nm to 500 nm, preferably 450 nm to 470 nm, which is a short wavelength region from near ultraviolet to visible light. The light emitting element 1 can be arbitrarily selected from the light emitting element 1 emitting blue light, the light emitting element 1 emitting red light, the light emitting element 1 emitting green light, and the like by appropriately selecting the wavelength conversion member 2 and the phosphorescent phosphor 3. In the illuminating device 100 according to the first embodiment, as shown in FIG. 2, the light emitting element 1 is flip-chip mounted on the support 6 in the light emitting device 10. 6 may be electrically connected through a conductive member such as a wire.

(Wavelength conversion member)
The wavelength conversion member 2 in this specification is distinguished from the phosphorescent phosphor 3 described later, and refers to all phosphors having no phosphorescent characteristics. The wavelength conversion member 2 only needs to be excited at least by the light emitted from the light emitting element 1. In the illumination device 100 according to the first embodiment, the wavelength conversion member 2 is provided in the light emitting device 10. As an example of the wavelength conversion member 2, the light emitting element 1 that emits blue light includes a YAG (yttrium, aluminum, garnet) -based phosphor activated with cerium that emits yellow light, (Sr, Ba) ₂ SiO ₄ : Eu, or the like. Silicate phosphors and the like can be used. By combining the light emitting element 1 that emits blue light and the above phosphor, white light can be easily obtained.

As the other wavelength conversion member 2, for example, a red phosphor or a green phosphor can be used. When the light emitting element 1 that emits blue light is used, white light can be easily obtained by combining the red phosphor and the green phosphor to form the wavelength conversion member 2.
In addition, the light emitting element 1 that emits blue light includes a YAG-based phosphor, and the light emitting device 10 that emits white light has a problem in that white light emission slightly reddish like a light bulb cannot be obtained and color rendering is poor. In such a case, the color rendering property of white light can be further improved by further providing a red phosphor as the wavelength conversion member 2.

As an example of the red phosphor, (Ca, Sr, Ba) ₂ Si ₅ (N, O) ₈ : Eu, (Ca, Sr, Ba) Si (N, O) ₂ : Eu, (Ca, Sr, Ba) ) AlSi (N, O) ₃ : Eu, (Sr, Ba) ₃ SiO ₅ : Eu, (Ca, Sr) S: Eu, SrAlSi ₄ N ₇ : Eu, (La, Y) ₂ O ₂ S: Eu, Β-diketone Eu complexes such as Eu (dibenzoylmethane) ₃ · 1,10-phenanthroline complex, carboxylic acid Eu complexes, and Mn-activated germanates are preferred, and (Ca, Sr, Ba) ₂ Si ₅ (N , O) ₈ : Eu, (Sr, Ca) AlSi (N, O) ₃ : Eu, SrAlSi ₄ N ₇ : Eu, (La, Y) ₂ O ₂ S: Eu, K ₂ SiF ₆ : Mn A part of Si may be substituted with Al or Na). As an example of the green _{phosphor, Si 6-Z Al Z O} Z N 8-Z: Eu, Ca 8 MgSi 4 O 16 C 12: Eu, Ba 3 Si 6 O 12 N 2: be used Eu, etc. I can do it.

  As shown in FIG. 2, the wavelength conversion member 2 is not limited to the structure that directly covers the light emitting element 1, and the wavelength conversion member 2 can be mixed with the sealing member 7, and further, the wavelength conversion member 2. Can be provided separately from the light emitting element 1. As a specific method for forming the wavelength conversion member 2, it can be formed by electrophoretic deposition, spray coating, printing, spraying, brushing, flow coating, dipping, potting, or the like. Further, the wavelength conversion member 2 may be formed in a sheet shape and attached to the surface of the translucent cover 4.

(Translucent cover)
The translucent cover 4 contains the phosphorescent phosphor 3 and is disposed so as to be separated from the light emitting device 10. The translucency in this specification means that the transmittance at the emission wavelength of the light emitting element 1 is 10% or more. The translucent cover 4 can be formed of an insulating transparent synthetic resin such as polycarbonate or acrylic resin, other thermosetting resin, thermoplastic resin, glass, or the like.

  The translucent cover 4 may contain a light diffusing material 5 in addition to the phosphorescent phosphor 3. By including the light diffusing material 5 in the translucent cover 4, the directivity of the emitted light from the light emitting device 10 can be relaxed. Therefore, the light emitted from the translucent cover 4 can be made uniform on the cover surface. Furthermore, by including the light diffusing material 5, it is possible to improve the design of the lighting device 100 when not emitting light in a bright place. As the light diffusing material 5, titanium oxide, glass beads, calcium carbonate, aluminum powder, mica, or the like can be used.

(Phosphorescent phosphor)
The phosphorescent phosphor 3 is contained in the translucent cover 4 and is separated from the light emitting device 10. According to this configuration, deterioration of the phosphorescent phosphor 3 due to heat from the light emitting device 10 can be prevented. The types of phosphorescent phosphors 3 are copper (Cu) activated zinc sulfide phosphor, europium (Eu) activated alkaline earth sulfide phosphor, europium (Eu) activated alkaline earth aluminate phosphor. And phosphorescent phosphors 3 such as europium (Eu) activated alkaline earth silicate phosphors can be used.

The phosphor 3 that emits blue light has a composition formula of (Ca _1-m Mg _m ) O · r (Al _{1-n B n} ) ₂ O ₃ : Eu, Nd (where m, n, and r are 0 ≦ m ≦ 0.2, 0 ≦ n ≦ 0.2 and 0.7 ≦ r ≦ 2.0). The europium-activated alkaline earth aluminate-based phosphor represented by mCaO. nMgO.2SiO ₂ : Eu, Dy, X (where X is one or more halogen elements selected from the group of F, Cl, Br and I, and m and n are 1.5 ≦ m ≦ 3, respectively) Europium-activated alkaline earth silicate phosphors represented by the following formula: mCaO.nMgO.2SiO ₂ : Eu, Nd, X (where X Is one or more halogen elements selected from the group of F, Cl, Br and I, and m and n are each 1.5 ≦ ≦ 3.5,0.5 ≦ n ≦ 1.5) represented by and the like europium-activated alkaline earth silicate phosphor such as in.

The phosphor 3 that emits green light has a composition formula (Sr _1-m Mg _m ) O · r (Al _{1-n B n} ) ₂ O ₃ : Eu, Dy (where m, n, and r are 0 ≦ m ≦ 0.2, 0 ≦ n ≦ 0.2, 0.7 ≦ r ≦ 2.0). The europium-activated alkaline earth aluminate-based phosphor represented by mSrO · nMgO · 2SiO ₂ : Eu, Dy, X (where X is one or more halogen elements selected from the group of F, Cl, Br and I, and m and n are 1.5 ≦ m ≦ 3.5 and Europium-activated alkaline earth silicate phosphor represented by 0.5 ≦ n ≦ 1.5), the composition formula is mSrO · nMgO · 2SiO ₂ : Eu, Nd, X (where X is F, Cl, One or more halogen elements selected from the group of Br and I, wherein m and n are 1.5 ≦ m ≦ 3.5 and 0.5 ≦, respectively. ≦ 1.5), a europium-activated alkaline earth silicate phosphor, a copper (Cu) -activated zinc sulfide phosphor whose composition formula is represented by ZnS: Cu, Cl, and the like. it can.

  Examples of the phosphor phosphor 3 that emits orange to red light include europium-activated calcium sulfide phosphors whose composition formula is represented by CaS: Eu.

  The concentration X of the phosphorescent phosphor 3 contained in the translucent cover 4 may be at least as long as the afterglow can be visually recognized. Preferably, the concentration X of the phosphorescent phosphor 3 contained in the translucent cover 4 is blended so that X ≦ 50 wt%, more preferably 1 wt% ≦ X ≦ 10 wt%. desirable. By setting the concentration X of the phosphorescent phosphor 3 to about 10% of the total mass of the phosphorescent phosphor-containing cover 12, the light emitted from the light emitting device 10 at the time of lighting is reflected by the phosphorescent phosphor 3, and the reflected light Can be prevented from returning to the light emitting device 10 side.

  The afterglow emission peak wavelength when passing through the translucent cover 4 containing the phosphorescent phosphor 3 is preferably about 300 nm to 750 nm, and more preferably the afterglow emission peak wavelength is 450 nm to 600 nm. It is preferable. By doing in this way, afterglow can fully be visually recognized, and when the wavelength conversion member 2 mentioned later is provided in the translucent cover 4, the wavelength conversion member 2 can be excited. Therefore, an arbitrary emission color can be emitted by combining the emitted light of afterglow and the emitted light of the wavelength conversion member 2 excited by the afterglow.

(Cover molding method)
Hereinafter, the translucent cover 4 containing at least the phosphorescent phosphor 3 is simply converted into the phosphorescent phosphor-containing cover 12 as appropriate. The phosphorescent phosphor-containing cover 12 can contain the wavelength conversion member 2, the light diffusion material 5, and the like in addition to the phosphorescent phosphor 3. When the phosphorescent phosphor-containing cover 12 described later is formed of a plurality of small covers, the phosphorescent phosphor-containing cover 12 is a combination of all the small covers.

As a method for molding the phosphorescent phosphor-containing cover 12, an injection molding method, a potting molding method, a transfer molding method, a compression molding method, or the like can be used. As an example of a specific forming method, a polycarbonate (the raw material of the translucent cover 4) and SrAl ₂ O ₄ : Eu, Dy of the phosphorescent phosphor 3 are mixed to have fluidity (liquid, sol, or slurry) Shape). Next, the phosphor mixture-containing cover 12 can be obtained by putting the mixture into a molding machine, placing a mold so as to have the shape of the phosphor phosphor-containing cover 12, and performing injection molding in the mold. . At this time, the phosphorescent phosphor-containing cover 12 having a desired shape can be obtained by making the shape of the mold arbitrary. However, the film thickness of the phosphorescent phosphor-containing cover 12 is desirably formed substantially uniformly.

  The shape of the phosphor-containing phosphor-containing cover 12 is not limited to the shape corresponding to the light bulb type illumination that covers the light emitting device 10 as shown in FIG. 1A, but also as shown in FIGS. 3A and 3B. A phosphorescent phosphor-containing cover 12 that is long in one direction corresponding to a tube-type bulb, a phosphorescent phosphor-containing cover 12 that corresponds to a downlight as shown in FIGS. I can do it. In the downlight of FIG. 4, the phosphorescent phosphor-containing cover 12 can be provided only in the portion corresponding to the light emitting device 10 as shown in FIG. 4B, or the phosphorescent phosphor-containing cover covering the entire surface on the light emitting surface side. The cover 12 can also be used.

As another form of the phosphorescent phosphor-containing cover 12, as shown in FIGS. 5A and 5B, the concentration of the phosphorescent phosphor 3 on the upper surface side of the translucent cover 4 is different from that of the translucent cover 4. The concentration of the phosphorescent phosphor 3 on the lower surface side can be reduced. By doing in this way, the light radiate | emitted to the upper surface side of the phosphorescent phosphor containing cover 12 which mainly takes out light emission in the normal lighting is reflected by the phosphorescent phosphor 3, and light returns to the light-emitting device 10 side. Probability can be reduced. Moreover, according to this structure, even if it is the same quantity of phosphorescence phosphor as the time of making phosphor phosphor 3 uniformly contain in the whole cover, inclusion of phosphor phosphor 3 contained in the lower surface side of translucent cover 4 The concentration can be increased. When the concentration of the phosphorescent phosphor 3 is increased, the afterglow time can be extended, so that the illumination device 100 according to this configuration can emit afterglow for a longer time. In the present specification, the upper surface side refers to the side from which light emission from the light emitting device 10 is extracted, and the upper surface side of the translucent cover 4 is the upper surface side from the position of 50% in the height direction of the translucent cover 4. Point to. The lower surface side refers to the direction opposite to the upper surface side, and the lower surface side of the translucent cover 4 refers to the lower side of the position of 50% in the height direction of the translucent cover 4.
Further, as shown in FIGS. 5C and 5D, the phosphorescent phosphor-containing cover 12 may be a cover that can be divided, and can be formed by combining a plurality of small covers. By combining a plurality of small covers, it is possible to obtain the phosphorescent phosphor-containing cover 12 in which the concentration of the phosphorescent phosphor 3 is different for each small cover. In this case, the concentration of the phosphor phosphor 3 in the small cover on the upper surface side of the phosphor phosphor-containing cover 12 should be less than the concentration of the phosphor phosphor 3 in the small cover on the lower surface side of the phosphor phosphor-containing cover 12. Is preferred. Although the phosphorescent phosphor-containing cover 12 in FIG. 5C is divided into two small covers, the phosphorescent phosphor-containing cover 12 can be arbitrarily formed with two or more small covers. According to this configuration, not only can the content concentration of the phosphorescent phosphor 3 be determined arbitrarily by each small cover, but the phosphorescent phosphor 3 having a different emission wavelength can be provided by each small cover.

  As shown in FIG. 6, the phosphorescent phosphor 3 can be further provided on the upper surface of the mounting substrate 11. According to this configuration, the light emitted from the light emitting device 10 to the side or below excites the phosphorescent phosphor 3 provided on the mounting substrate 11, and the phosphorescent phosphor 3 contained in the translucent cover 4 when extinguished. Afterglow can be efficiently obtained from both the phosphorescent phosphors 3 on the mounting substrate 11.

(Second embodiment)
With reference to FIG. 7, the structure of the illuminating device 200 which concerns on 2nd embodiment of this invention is demonstrated. As shown in FIG. 7, the illumination device 200 according to the second embodiment includes a light emitting device 10 including the light emitting element 1, a wavelength conversion member 2, and a translucent cover 4 containing the phosphorescent phosphor 3. . The difference from the illumination device 100 according to the first embodiment is that the wavelength conversion member 2 is provided in the translucent cover 4. Hereinafter, points different from the first embodiment will be described in detail, and points that are the same as the first embodiment will be omitted as appropriate.

  As for the illuminating device 200 which concerns on 2nd embodiment, the wavelength conversion member 2 is provided in the translucent cover 4. FIG. According to this configuration, when the wavelength conversion member 2 is separated from the light emitting device 10, even the wavelength conversion member 2 that is relatively heat-sensitive can be used without deterioration.

  The wavelength conversion member 2 only needs to be provided in the translucent cover 4 and can be contained in the translucent cover 4 together with the phosphorescent phosphor 3 as shown in FIG. As another form, the wavelength conversion member 2 can be provided on the surface of the translucent cover 4 by printing, spraying, brushing, flow coating, or dipping. Further, the wavelength conversion member 2 may be formed in a sheet shape and attached to the surface of the translucent cover 4.

In the illumination device 200 according to the second embodiment, the wavelength conversion member 2 may be further provided on the light emitting device 10 side. That is, the wavelength conversion member 2 can be provided in both the light emitting device 10 and the translucent cover 4. As an example of this form, the light-emitting device 10 includes a light-emitting element 1 that emits blue light and a wavelength conversion member 2 such as a YAG phosphor, and the translucent cover 4 has Ca ₂ Si ₅ N ₈ : Eu, CaAlSiN ₃ : A wavelength conversion member 2 of a red phosphor such as Eu, (Sr, Ca) AlSiN ₃ : Eu, K ₂ SiF ₆ : Mn can be provided. According to this configuration, the color rendering property of the emitted light of the light emitting device 10 can be improved by the red phosphor provided on the translucent cover 4 with the white light emitted from the light emitting device 10.

  Similarly to the lighting device 100 according to the first embodiment, the phosphorescent phosphor-containing cover 12 of the lighting device 200 according to the second embodiment can be formed by combining a plurality of small covers. As an example of this configuration, the wavelength conversion member 2 of the red phosphor can be contained on the upper surface side of the translucent cover 4, and the phosphorescent phosphor 3 can be contained on the lower surface side of the translucent cover 4. According to this configuration, the lighting device 200 can obtain white light with improved color rendering properties during normal lighting, and can efficiently obtain afterglow by the phosphorescent phosphor 3 contained on the lower surface side when the lighting is turned off. I can do it. At this time, it is preferable that the wavelength conversion member 2 is excited by the light emitted from the phosphorescent phosphor 3. For example, when the phosphorescent phosphor 3 is a blue-green phosphorescent phosphor 3, an illumination device 200 that emits white light during afterglow can be obtained.

(Cover molding method)
The method for forming the phosphorescent phosphor-containing cover 12 can be formed in the same manner as in the first embodiment. For example, when the phosphorescent phosphor 3 and the wavelength conversion member 2 are contained in the translucent cover 4, the raw material of the translucent cover 4, the phosphorescent phosphor 3, and the wavelength conversion member 2 are mixed, and the mixture is formed by injection molding or the like. It can be formed as the phosphorescent phosphor-containing cover 12. In this case, the desired phosphorescent phosphor-containing cover 12 can be formed by arbitrarily selecting the concentration of the phosphorescent phosphor 3 and the wavelength conversion member 2.

The light emitting device 10 of the present invention can be suitably used as a light source for illumination such as light bulb type illumination, straight tube type illumination, and downlight illumination.

DESCRIPTION OF SYMBOLS 1 ... Light emitting element 2 ... Wavelength conversion member 3 ... Phosphorescent phosphor 4 ... Translucent cover 5 ... Light-diffusion material 6 ... Support body 7 ... Sealing member 10 ... Light-emitting device 11 ... Mounting board 12 ... Phosphorescent phosphor containing cover 100 , 200 ... Lighting device

Claims (8)

A light emitting device comprising a light emitting element;
A wavelength conversion member that is excited by light emitted from the light emitting element;
A translucent cover disposed away from the light emitting device and containing a phosphorescent phosphor;
A lighting device comprising:   The illumination device according to claim 1, wherein the wavelength conversion member is provided in the light emitting device.   The lighting device according to claim 1, wherein the phosphorescent phosphor contained in the translucent cover is 1 wt% to 10 wt%.   The illuminating device according to any one of claims 1 to 3, wherein the wavelength conversion member is provided in the translucent cover.   The light emitting device according to claim 4, wherein a wavelength conversion member provided in the translucent cover is excited by light emitted from the phosphorescent phosphor.   The content concentration of the phosphorescent phosphor on the upper surface side of the translucent cover is less than the content concentration of the phosphorescent phosphor on the lower surface side of the translucent cover. The illumination device according to any one of the above.   The illumination device includes a light emitting device including the light emitting element and a mounting substrate on which the light emitting device is mounted, and the phosphorescent phosphor is further provided on an upper surface of the mounting substrate. The illumination device according to any one of claims 1 to 6.   The lighting device according to claim 1, wherein the light transmissive cover contains a light diffusing material.

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