JP5036332B2 - Light emitting device and color conversion filter - Google Patents

Description

  The present invention relates to a filter for converting the light emission color of a light emitting element, and a light emitting device such as a display using the color conversion filter.

  White light-emitting diodes (LEDs) are often used as backlights in liquid crystal displays (LCDs) for mobile phones and flat-screen TVs. As a white LED for these uses, as in the light emitting devices described in Patent Documents 1 and 2, a blue LED and a phosphor that emits yellow light when excited by blue light (hereinafter referred to as a yellow phosphor) are combined. A structure that emits white light by mixing blue light and yellow light is known.

The light emitting devices of Patent Documents 1 and 2 prevent uneven color by providing a predetermined interval between the blue LED and the phosphor layer. However, if the amount of light emitted from the blue LED to the phosphor layer is increased in order to increase the amount of light emitted from the light emitting device, the temperature of the phosphor layer increases and the conversion efficiency of the phosphor layer to fluorescence (yellow light) is increased. Decreases and the color tone of the emitted color changes to the blue side. Therefore, in Patent Documents 1 and 2, the phosphor layer is provided with a heat dissipation member to prevent the temperature of the phosphor layer from rising. As a heat radiating member, in Patent Document 1, a member having a refrigerant flow path therein or a metal plate having a plurality of through holes are used. In Patent Document 2, a metal wire or a metal wire mesh is used as a heat dissipation member.
JP 2005-294185 A Japanese Patent Laying-Open No. 2005-311170

  In the light-emitting devices described in Patent Documents 1 and 2, when a metal plate or metal wire mesh having a plurality of penetrating lights is used as a heat dissipation member, the metal plate or metal wire mesh is diffused by light diffusion in the phosphor layer. This prevents the shadows from appearing in the emitted light. For this reason, when the structure of these light emitting devices is used for a display device including a plurality of blue LEDs and displaying a plurality of white dots, crosstalk may occur between adjacent dots due to light diffusion in the phosphor layer. There is.

  An object of the present invention is to provide a light emitting device capable of efficiently suppressing a temperature rise of a phosphor layer and preventing crosstalk when performing dot display.

  In order to achieve the above object, according to the first aspect of the present invention, the following light emitting device is provided. That is, it has a plurality of light emitting elements arranged on the substrate and a color conversion filter arranged at a position facing the surface of the substrate on which the light emitting elements are arranged. A phosphor layer including a phosphor excited by emitted light, and a heat conductive film disposed on the surface of the phosphor layer on the light emitting element side and having higher thermal conductivity than the phosphor layer are provided. In the phosphor layer, recesses are formed around a plurality of regions respectively facing the plurality of light emitting elements, the heat conductive film is disposed on the inner wall of the recesses, and the regions are provided with openings.

  Thereby, the light emitted from the light emitting element enters the phosphor layer from the opening of the heat conducting film. The light incident on the phosphor layer and the fluorescence generated in the phosphor layer are mixed and emitted from the phosphor layer. At this time, light is scattered in the in-plane direction inside the phosphor layer, and the concave portion prevents the phosphor layer from reaching the upper part of the opening of the adjacent thermal conductive film, thereby realizing dot display while preventing crosstalk. it can. Further, since the heat of the phosphor layer can be efficiently dissipated from the heat conductive film on the inner wall of the recess, uneven color due to the temperature rise of the phosphor layer can be prevented.

  The above-described heat conductive film can be made of a metal material or a resin material. Further, the phosphor layer can be composed of a plurality of layers each including a phosphor excited by light emitted from the light emitting element, and the fluorescence emitted from the plurality of layers can have different wavelengths. Is possible.

  On the surface of the phosphor layer opposite to the surface on which the heat conductive film is disposed, a light shielding member having an opening can be disposed at a position facing the opening of the heat conductive film. Thereby, the edge of the dot displayed with the light emitted from the phosphor layer can be sharpened. The light shielding member can include a base material and a filler dispersed in the base material. Thereby, it is possible to dissipate heat not only from the heat conductive film but also from the light shielding member.

  For example, the light emitting element emits blue light, and the phosphor layer can be configured to convert part of the blue light into fluorescence and mix the fluorescence and blue light to emit white light.

  According to another aspect of the present invention, there is provided a color conversion filter for converting the emission colors of a plurality of light emitting elements, the phosphor layer including a phosphor excited by light emitted from the light emitting elements, And a thermal conductive film disposed on the light emitting element side surface of the body layer and having higher thermal conductivity than the phosphor layer, and the phosphor layer has a plurality of regions around the plurality of regions corresponding to the plurality of light emitting elements. A concave portion is formed, the heat conductive film is disposed on the inner wall of the concave portion, and a color conversion filter having openings in a plurality of regions can be provided.

  According to the present invention, the temperature rise of the phosphor layer can be efficiently suppressed, and the scattering of light in the phosphor layer can be kept within the region surrounded by the recesses, so that crosstalk can be prevented and dot display can be performed. A light emitting device suitable for the above can be provided.

An embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
A dot matrix display using the color conversion filter of the first embodiment will be described with reference to FIGS.

  As shown in FIG. 1, the dot matrix display according to the first embodiment includes a substrate 13 on which a plurality of blue LEDs 12 are mounted, and a color conversion filter 10 that is disposed to face the blue LED 12 mounting side of the substrate 13. And a housing 14 for supporting them. The blue LEDs 12 are arranged one-dimensionally or two-dimensionally on the substrate 13 in a predetermined pattern. Here, for convenience of illustration, a case where the blue LEDs 12 are arranged in 2 × 4 will be described as an example.

  The blue LED 12 is a known LED that emits blue light toward the upper surface (color conversion filter 10). For example, a GaN-based LED can be used. The emission wavelength is preferably in the range of 420 to 480 nm, particularly 450 to 460 nm.

As shown in FIGS. 1 and 2A, the color conversion filter 10 includes a phosphor filter 16 and a metal film 17 disposed on the surface of the phosphor filter 16 on the LED 12 side. The phosphor filter 16 is a plate-like phosphor including a yellow phosphor and glass as a binder. The yellow phosphor is a material that is excited by blue wavelength light emitted from the blue LED 12 and emits yellow light (fluorescence). For example, when the emission wavelength of the blue LED 12 is 450 to 460 nm, YAG: Ce ((Y , Gd) ₃ Al ₅ O ₁₂ : Ce). As the glass, it is desirable to use a glass having a softening point of 400 ° C. or higher.

  Grooves 19 are formed in the phosphor filter 1 vertically and horizontally so as to surround regions facing the arranged blue LEDs 12, respectively. For this reason, the thickness of the phosphor filter 16 is thick in the region facing the blue LED 12, and the other region (the region of the groove 19) is thinned, and the phosphor filter 16 has only the region facing the blue LED 12. It is a convex part. The side surface of the groove 19 is inclined at a predetermined angle as shown in FIG. 1 and FIG.

  The metal film 17 is disposed on the bottom surface and the side surface of the groove 19 and is not disposed on the top surface of the convex portion respectively facing the arranged LEDs 12, and this portion becomes an opening (window) 18 of the metal film 17. ing. The metal film 17 is preferably formed of a material having high thermal conductivity. For example, it can be formed of Al, Ag, Au, Ni, Cu, an alloy containing one or more of these metals, or a multilayer film containing these metals. The film thickness of the metal film 17 is preferably, for example, not less than 300 nm and not more than 10 μm. Instead of the metal film 17, a highly heat conductive resin film (for example, Fujikura Kasei XA-819) can be used. In the case of using a resin film, a metal filler can be contained for the purpose of imparting light reflectivity and enhancing thermal conductivity.

  A black mask 20 is disposed on the upper surface (white light emitting surface) of the phosphor filter 16 as a light shielding member. The black mask 20 is a film or thin plate having a black surface, for example, and an opening 21 is formed at a position facing the window 18 of the metal film 17 as shown in FIG. For example, it is possible to use a black mask 20 formed of a conductive paste in which Ag is dispersed, a thin metal plate having a black surface, or the like.

  One window 18 of the metal film 17 and the opening 21 of the black mask 20 correspond to one dot (pixel) displayed on the dot matrix display. Therefore, the size and shape of the window 18 and the opening 21 are determined in consideration of the size and shape required as a dot, the spread of light in the phosphor filter 16, reflection of the spread light by the inclined surface of the groove 19, and the like. Designed to obtain dots of desired size and shape.

  Although not shown, a control circuit and a power circuit are connected to the blue LEDs 12 respectively. The control circuit performs control to cause a predetermined one of the plurality of blue LEDs 12 to emit light.

Next, a method for manufacturing the display shown in FIG. 1 will be described.
First, a method for manufacturing the color conversion filter 10 will be described. The above-described yellow phosphor powder having predetermined excitation and emission characteristics is prepared, mixed with the glass powder serving as a binder, formed into a flat plate shape, and fired to form a flat plate phosphor filter. Grooves 19 having a predetermined width, depth, and inclination are formed vertically and horizontally on one surface of the flat phosphor filter by dicing or the like, and the phosphor filter 16 having the grooves 19 is obtained.

  Next, the metal film 17 is formed on the entire surface of the phosphor filter with the groove 19 formed thereon by a desired film formation method such as vacuum deposition or sputtering. The window 18 is formed by removing the metal film 17 only on the upper surface of the convex portion surrounded by the groove 19 by photolithography and etching techniques.

  The black mask 20 is manufactured by forming openings 21 in a metal plate by etching or the like as shown in FIG. 2B separately prepared, and forming a black film as a whole by plating or coating as necessary.

  The color conversion filter 10 is completed by fixing the black mask 20 to the phosphor filter 16.

  On the other hand, the blue LED 12 is fixed by die bonding or the like on a substrate 13 on which electrodes or wirings are formed in advance, and is electrically connected by wire bonding or the like as necessary. The blue LED 12 is a known light-emitting element, and its manufacturing method is widely known, and thus the description thereof is omitted. Finally, the substrate 13 and the color conversion filter 10 are arranged to face each other at a predetermined interval, and fixed to the housing 14, whereby the dot matrix display shown in FIG. 1 can be manufactured.

Next, the operation of the dot matrix display of FIG. 1 will be described.
The predetermined blue LED 12 is caused to emit light under the control of the control circuit. The emitted blue light enters the phosphor filter 16 through the window 16 of the metal film 17 provided at a position facing the emitted blue LED 12, and excites the phosphor constituting the phosphor filter 16. Part is converted to yellow light. The yellow light and the unconverted blue light are mixed to become white light, which is emitted from the opening 21 of the black mask 20. Thereby, a desired dot can be displayed with white light. By causing only the predetermined blue LED 12 to emit light under the control of the control circuit, the desired display content can be displayed with a dot matrix of white light.

  At this time, the phosphor filter 16 rises in temperature by being irradiated with blue light from the window 18. In particular, when the dot matrix display has a high current of several hundred mA for the blue LED 12 as in a street display or the like and has a high luminance, the phosphor filter 16 is locally applied from the window 18. Is irradiated with blue light of large energy and tends to become high temperature. In the present embodiment, since the metal film 17 is disposed around the window 18 (that is, the side surface of the convex portion), the heat of the phosphor filter 16 is transferred between the metal film 17 and the color conversion filter 10 and the substrate 13. It is possible to dissipate heat to the space. Moreover, in the present embodiment, since the groove 19 is provided in the phosphor filter 16, the surface area of the metal film 19 around the window 18 is larger than when the groove 19 is not provided. Thereby, the heat dissipation effect by the metal film 17 is large, and the temperature rise of the phosphor filter 16 can be suppressed.

  Further, even when a part of the convex portion of the phosphor filter 16 is locally heated, the metal film 17 can dissipate heat while conducting heat and dispersing it around. Thereby, local temperature rise of the phosphor filter 16 can be prevented.

  In the display shown in FIG. 2, since the groove 19 is formed in the phosphor filter 16 and the metal film 17 is disposed on the side surface of the groove 19, the blue light incident from the window 18 and the converted yellow light are converted. Among them, the light traveling in the main plane direction in the phosphor filter 16 is reflected on the inclined side surface of the groove 19 and rises toward the opening 21. As a result, the light incident from the window 18 can be limited in the region surrounded by the groove 19 in the phosphor filter 16 in the main plane direction, and the light is emitted from the adjacent opening 21 ( Crosstalk) can be prevented. Therefore, high-definition display can be performed. Moreover, white light can be efficiently emitted from the opening 21 due to the light rising effect in the reflection of the side surface of the groove 19, and the brightness of the dots can be improved.

  As described above, since the dot matrix display of the first embodiment can use the metal film 17 having a large surface area for exhaust heat, the temperature rise of the entire phosphor filter 16 is suppressed, and the temperature quenching of the phosphor is performed. And the shift of the emission wavelength can be reduced. Moreover, since the local temperature rise of the phosphor filter 16 can be reduced, a dot matrix display with high chromaticity uniformity can be obtained.

  Further, since light is raised by the metal film 17 on the inclined surface of the groove 19, a dot matrix display with reduced crosstalk can be realized by using a single phosphor filter. For this reason, it is not necessary to arrange | position a fluorescent substance layer separately for every LED12, and since it can each color-convert with one fluorescent substance filter, a display with few color unevenness and dispersion | variation can be provided.

  Further, by arranging the black mask 20, the region where the phosphor filter 16 emits white light can be limited to the opening 21, the spread of white light dots is suppressed, and the dot edges are sharp and high-definition. Display can be made.

  The black mask 20 can also be formed by forming a metal film on the upper surface of the phosphor filter 16 by vapor deposition or the like and removing the metal film in the opening 21 by etching using photolithography.

  Furthermore, for example, a method of forming the black mask 20 having the openings 21 by printing a paste in which a powder of a material having high thermal conductivity such as Ag is dispersed using a printing mask can be used. It is also possible to form the black mask 20 by applying the pigment-dispersed photoresist and then forming the openings 21 using a photolithography technique.

  After the black mask 20 is formed, it is preferable to apply a heat radiation coating on the surface, or to perform an alumite treatment when a metal plate or a metal film is used. This is because such surface treatment can promote infrared radiation and improve the heat dissipation effect of the black mask 20.

  Note that the dot matrix display device having the configuration of FIG. 2 does not necessarily include the black mask 20 and can be configured to have the black mask 20 removed. Even in such a case, the effect of preventing wavelength shift and color unevenness due to the suppression of the temperature rise of the phosphor filter 16 and the effect of reducing crosstalk can be obtained by the action of the groove 19 and the metal film 17.

(Second Embodiment)
As a second embodiment, the color conversion filter 210 shown in FIG. 3 will be described.

  Similar to the color conversion filter 110 of the first embodiment, the color conversion filter 210 of FIG. 3A includes the phosphor filter 16, the metal film 17, and the black mask 20. The filter 16 is different from the first embodiment in that the filter 16 has a two-layer structure of a green phosphor filter 16a and a red phosphor filter 16b. Other configurations are the same as those of the first embodiment.

That is, the phosphor filter layer 16 includes a green phosphor filter 16a including a phosphor that is excited by blue light and emits green light, and a red phosphor filter 16b that includes a phosphor that is excited by blue light and emits red light. Has been. By adopting a two-layer structure in this way, the light emission characteristics can be controlled by controlling the composition and thickness of the phosphor materials of the respective phosphor filters 16a and 16b. It can be easily realized. The green phosphor, for _{example, Sr x Ca 1-x Ga} 2 S 4: Eu and _{(Sr, Ba) 2 SiO 4} : Eu or the like can be used. For example, Sr _1-x Ca _x S: Eu or CaAlSiN ₃ : Eu can be used as the red phosphor.

  3A shows an example in which the depth of the groove 19 is about half of the thickness of the red phosphor filter 16b, it is not limited to the configuration of FIG. Of course, it is possible to form the groove 19 to a depth reaching the green phosphor filter 16b.

  In the second embodiment, as shown in FIG. 3B, the color conversion filter 210 in which dots (openings 21) are arranged in 1 × 3 is shown. However, the present invention is not limited to this configuration. It is possible to arrange dots in a desired arrangement in one or two dimensions.

  Also, a dot matrix display can be configured as shown in FIGS. 1 and 2 using the color conversion filter 210 of FIG.

  As in the first and second embodiments described above, since the display device of the present invention has good heat dissipation of the color conversion filter, it is possible to prevent a decrease in the amount of light due to temperature quenching of the phosphor, and to shift the emission wavelength. Can be prevented. Further, crosstalk between dots can be prevented.

  Note that the present invention is not limited to a dot matrix display, and various light emitting devices such as those for illumination can be configured by changing the arrangement and arrangement of LEDs.

  Further, by changing the phosphor concentration and thickness of the phosphor filter of the color conversion filter, it is possible to easily configure displays and light emitting devices having various color temperatures.

  In the present invention, since the black mask 20 that can be formed using a photolithographic technique or an etching metal mask can be combined with the color conversion filter, the shape is highly flexible, and the light emission shape of the display or light emitting device ( (Dot) edge can be sharpened.

In the above description, a blue LED is used as an example, but an ultraviolet LED having an emission wavelength of, for example, about 380 nm can also be used. In such a case, a phosphor suitable for converting near-ultraviolet light into visible light is selected. For example, BAM: Eu (BaMgAl ₁₀ O ₁₇ : Eu) can be used as a phosphor that converts near-ultraviolet light into blue, and (Sr, Ca, Ba) SiO ₄ : Eu can be used as a phosphor that converts green.

Furthermore, the emission color of the display device or the light emitting device may be other than white, for example, reddish purple, blue green, or a warm-colored bulb color, depending on the combination of the phosphor and the LED.

In the display devices of the first and second embodiments described above, the white light emitting surface of the color conversion filter 10, 110, 210 is made of a resin such as silicone, epoxy, silicon epoxy, or the like in accordance with the specifications required for the package. Alternatively, it can be coated with a low-melting glass or the like. Thereby, environmental resistance can be improved. Further, by dispersing a light diffusing material such as SiO ₂ powder in a resin or glass for coating, it is possible to disperse white light to make uniform light.

Examples of the present invention will be described below.
Example 1
As Example 1, the color conversion filter 10 of FIG. 1 of the first embodiment was manufactured.
First, 6 wt% of a yellow phosphor YAG: Ce (P46-Y3 manufactured by Kasei Optonix Co., Ltd.) is dispersed in an alkali-free silica glass and baked at about 800 ° C. for 1 hour in a phosphor filter. Was made. The thickness was 0.3 mm. Next, the grooves 19 were formed vertically and horizontally at intervals of 1 mm by dicing. The depth of the groove was 0.2 mm, and the inclination angle of the wall surface of the groove was about 30 ° with respect to the filter surface. As a result, two convex portions having an upper surface of 1 mm square were formed.

  An Al film 17 having a thickness of about 1 μm was formed on the surface of the phosphor filter 16 on which the groove 19 was formed by vacuum deposition. In the Al film 17, a square window 18 having a side of 1 mm was formed by etching on the upper surface of the convex portion. Thereby, the color conversion filter 10 of FIG. 1 was able to be manufactured.

(Example 2)
As Example 2, the color conversion filter 210 of FIG. 3A of the second embodiment was manufactured.
First, green phosphor is obtained by dispersing 6 wt% of Sr _0.6 Ca _0.4 Ga ₂ S ₄ : Eu as a green phosphor in an alkali-free silica-based glass and firing in air at about 800 ° C. for 1 hour. A filter 16a was produced. The thickness was 0.3 mm. On the other hand, 1 wt% of Sr _0.75 Ca _0.25 S: Eu as a red phosphor is dispersed in an alkali-free silica glass and baked at about 800 ° C. for several hours in the air to obtain a red phosphor filter 16b. Was made. The thickness was 0.3 mm. A green phosphor filter 16a was overlaid on the red phosphor filter 16b, and a groove 19 was formed on the lower surface of the red phosphor filter 16 by dicing. The depth of the groove was 0.2 mm, and the inclination angle of the wall surface of the groove was about 30 ° with respect to the filter surface. Thereafter, an Al film 17 having a thickness of about 1 μm was formed on the entire surface of the dicing surface by vacuum deposition, and a window 18 was formed by etching. Thereby, the color conversion filter 210 of FIG. 3A was able to be manufactured.

(Evaluation)
As a display for evaluation in this example, the display of FIG. 1 was manufactured using a green phosphor. That is, phosphor filter 16 was produced by dispersing 6 wt% of Sr _0.6 Ca _0.4 Ga ₂ S ₄ : Eu in alkali-free silica-based glass and firing in air at about 800 ° C. for 1 hour. . The thickness was 0.3 mm. Next, an Al film having a thickness of about 1 μm was formed as a metal film 17 on the lower surface of the phosphor filter 16 by a vacuum deposition method. On the Al film 17, a square window 18 having a side of 1 mm was formed by etching at a predetermined position corresponding to the blue LED 12. The number of windows was two.

  The evaluation color conversion filter 10 was placed opposite to a substrate 13 on which two blue LEDs 12 were arranged to manufacture the display shown in FIG.

As a display of a comparative example, a green phosphor Sr _0.6 Ca _0.4 Ga ₂ S ₄ : Eu in which 5 wt% is dispersed in silicone (manufactured by Toray Industries, Inc., JCR6175) is prepared. It apply | coated on the attached board | substrate 13 and coat | covered LED. Thereby, the display of the comparative example was manufactured.

  A drive current was supplied to the blue LEDs of the display for evaluation of the above example and the display of the comparative example, and the intensity of emitted blue-green light was measured. The result is shown in FIG. FIG. 4 is a graph showing the relative change of the luminance when the display device of the example and the display device of the comparative example are driven at a current of 350 mA, with the luminance being 1. As shown in FIG. 4, as the drive current increases, the emission intensity increases in both the example and the comparative example. However, when the drive current exceeds 400 mA, the emission intensity increases in the example, whereas the reverse in the comparative example. Shows a tendency for the emission intensity to decrease.

  This is presumably because, in the display device of the comparative example, when the driving current was 400 mA or more, the temperature of the phosphor increased and temperature quenching occurred. In contrast, in this example, the increase in the emission intensity continued to the vicinity of the drive current of 750 mA. This is presumably because in the display device of the example, the heat of the phosphor filter was effectively dissipated by the metal film 17, so that the temperature rise could be suppressed. Thus, it was confirmed that temperature quenching can be suppressed in this example.

Sectional drawing which shows the structure of the dot matrix display of 1st Embodiment. (A) Sectional drawing of the color conversion filter 10 of the display of FIG. 1, (b) Top view. (A) Sectional drawing of the color conversion filter 210 of 2nd Embodiment, (b) Top view. The graph which shows the change by the drive current of light emission intensity about the sample for evaluation of an Example, and the sample of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Color conversion filter, 12 ... Blue LED, 13 ... Board | substrate, 14 ... Housing, 16 ... Phosphor filter, 16a ... Green phosphor filter, 16b ... Red phosphor filter, 17 ... Metal film, 18 ... Metal film window , 19 ... grooves, 20 ... black mask, 21 ... opening, 210 ... color conversion filter.

Claims (8)

A plurality of light emitting elements arranged on the substrate, and a color conversion filter disposed at a position facing the surface of the substrate on which the light emitting elements are disposed,
The color conversion filter is disposed on a phosphor layer including a phosphor excited by light emitted from the light emitting element, and on the surface of the phosphor layer on the light emitting element side, and is more thermally conductive than the phosphor layer. With a high thermal conductive film,
In the phosphor layer, recesses are formed around a plurality of regions respectively facing the plurality of light emitting elements, the thermal conductive film is disposed on an inner wall of the recesses, and the plurality of regions include openings. A light emitting device characterized by comprising:   2. The light emitting device according to claim 1, wherein the heat conductive film is made of a metal material or a resin material.   3. The light-emitting device according to claim 1, wherein the phosphor layer includes a plurality of layers each including a phosphor excited by light emitted from the light-emitting element, and fluorescence emitted from the plurality of layers. Are light-emitting devices each having a different wavelength.   4. The light-emitting device according to claim 1, wherein a surface of the phosphor layer opposite to a surface on which the heat conductive film is disposed is a position facing the opening of the heat conductive film. A light-emitting device, wherein a light shielding member having an opening is disposed.   The light-emitting device according to claim 4, wherein the light shielding member includes a base material and a filler that is dispersed in the base material and has higher thermal conductivity than the base material.   6. The light emitting device according to claim 1, wherein the light emitting element emits blue light, and the phosphor layer converts a part of the blue light into fluorescence. A light-emitting device that emits white light by mixing with light. A color conversion filter for converting the light emission color of a plurality of light emitting elements,
A phosphor layer containing a phosphor excited by light emitted from the light emitting element, and a heat conductive film disposed on the surface of the phosphor layer on the light emitting element side and having a higher thermal conductivity than the phosphor layer. Have
Wherein the phosphor layer, the recess is formed around the plurality of regions corresponding to the plurality of light emitting elements, the thermal conductive layer is disposed on an inner wall of the recess, said plurality of regions comprises an opening A color conversion filter characterized by   The color conversion filter according to claim 7, wherein the phosphor layer includes a plurality of layers each including a phosphor excited by light emitted from the light emitting element, and fluorescence emitted from the plurality of layers has different wavelengths. A color conversion filter characterized by that.

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