JP2006179684A - Light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting device in which light emitted from a light emitting element can be wavelength-converted to obtain the light emission of a desirable color and a sufficient light fetching efficiency is provided. <P>SOLUTION: The light emitting device is provided with a light emitting element 1, and a wavelength conversion layer 2 which contains a wavelength conversion substance of wavelength-converting light emitted from this light emitting element 1. The wavelength conversion layer 2 has a wavelength conversion division 3 containing the wavelength conversion substance and a transparent division 4 which has the smaller content of the wavelength conversion substance than in the wavelength conversion division 3. For this reason, the light after having transmitted the wavelength conversion layer 2 contains the wavelength converted one with the wavelength conversion substance in the wavelength conversion division 3, and light having a different hue from a light color emitted from the light emitting element 1 is emitted from the light emitting device A. Further, in the transparent division 4, it is harder for light to scatter due to the wavelength conversion substance than when transmitting the wavelength conversion division 3, and an amount of light which transmits the wavelength conversion layer 2 can be enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light-emitting device such as an LED light-emitting device that converts the wavelength of light emitted from a light-emitting element such as an LED.

  Light-emitting devices such as LED light-emitting devices have advantages such as small size, light weight, and power saving, and are currently widely used as a light source for display, a small light bulb, or a light source for liquid crystal panels. Such a light-emitting device is composed of a light-emitting element such as an LED. If necessary, the light emitted from the light-emitting element is passed through various wavelength-converting substances such as phosphors so that the original light-emitting element can be used. A light emitting device that emits light of a color different from the emission color has also been developed.

  In recent years, LED chips that emit blue light or ultraviolet light using gallium nitride compound semiconductors have been developed. By combining these light emitting elements with various wavelength conversion materials, light of various colors including white can be obtained. Attempts have been made to develop light emitting devices that emit light.

As a method for fixing the wavelength converting substance in such a light emitting device, one or a plurality of light emitting elements are mounted on a mounting substrate, and the wavelength converting substance is dispersed and contained in the mounting part of the light emitting elements. A method of forming a light emitting portion by disposing a wavelength conversion layer is generally used (see Patent Document 1).
JP 2003-046133 A

  However, when the light emitted from the light emitting element passes through the wavelength conversion layer, the light is easily scattered by the wavelength conversion material dispersed in the wavelength conversion layer, and thus it is difficult to secure a sufficient amount of light. In some cases, the light extraction efficiency from the light emitting element is reduced.

  The present invention has been made in view of the above points, and provides a light-emitting device capable of obtaining light of a desired color by converting the wavelength of light emitted from a light-emitting element and having sufficient light extraction efficiency. It is intended to do.

  The light-emitting device A according to the present invention is a light-emitting device A including the light-emitting element 1 and a wavelength conversion layer 2 containing a wavelength conversion material that converts the wavelength of light emitted from the light-emitting element 1. However, it has the wavelength conversion zone 3 containing a wavelength conversion substance, and the transparent division 4 with less content of a wavelength conversion substance than the said wavelength conversion zone 3. It is characterized by the above-mentioned. For this reason, when the light emitted from the light emitting element 1 is transmitted through the wavelength conversion layer 2, a part of the light is transmitted through the wavelength conversion section 3, and at this time, a part of the light is further wavelength-converted by the wavelength conversion substance. The other part of the light passes through the transparent section 4 or is incident on the wavelength conversion section 3 from the interface between the transparent section 4 and the wavelength conversion section 3 via the transparent section 4 and then extracted outside. . As a result, the light that has been transmitted through the wavelength conversion layer 2 includes light that has been wavelength-converted by the wavelength conversion material, and light having a color different from the color emitted from the light-emitting element 1 is emitted from the light-emitting device A. Can be emitted from. Furthermore, in the transparent section 4, light scattering due to the wavelength conversion substance is less likely to occur than in the case of transmitting through the wavelength conversion section 3, whereby the amount of light transmitted through the wavelength conversion layer 2 can be improved.

  In such a light emitting device A, the wavelength conversion section 3 is formed by laminating the wavelength conversion phase 5 containing the wavelength conversion material and the transparent phase 6 having a smaller content of the wavelength conversion material than the wavelength conversion phase 5. In addition to being formed, the transparent section 4 can be formed of only the transparent phase 6. In this case, the wavelength conversion section 3 can be formed only by laminating the wavelength conversion phase 5 and the transparent phase 6, and productivity can be improved.

  Further, the wavelength conversion section 3 includes a wavelength conversion phase 5 containing a wavelength conversion substance, and the wavelength conversion phase 5 is composed of a transparent phase 6 having a smaller content of the wavelength conversion substance than the wavelength conversion phase 5. Alternatively, the concave portion 8 or the penetrating portion provided in the mother base 7 may be filled with a wavelength conversion substance. In this case, the wavelength conversion phase 5 can be formed only by filling the concave portion 8 or the penetrating portion with the wavelength conversion substance, and the productivity can be improved.

  Further, when the wavelength conversion phase 5 is formed in the concave portion 8 or the through portion of the base material 7 in this way, the exposed portion of the wavelength conversion phase 5 at the opening of the concave portion 8 in the base material 7 becomes the transparent phase 6. You may make it close | close with the cover member 9 comprised. In this case, scattering and leakage of the wavelength converting substance filled in the concave portion 8 or the penetrating portion can be prevented by the lid member 9, and therefore the yield during production can be improved.

  In the wavelength conversion layer 2 as described above, it is preferable that the minimum width dimension of the wavelength conversion section 3 is 0.1 mm or less. In this way, since the fine wavelength conversion section 3 is dispersed in the wavelength conversion layer 2, the light that has been wavelength-converted by being transmitted through the wavelength conversion section 3 is uniformly dispersed during light emission from the light emitting device A. As a result, color unevenness can be significantly reduced.

  Moreover, the ratio of the projected area of the wavelength conversion layer 2 in the direction of extracting light from the light emitting element 1 between the wavelength conversion section 3 and the transparent section 4 is set in a range of 5: 1 to 1: 5. It is preferable. If it does in this way, the light quantity of the light which permeate | transmits the transparent division 4, ie, the light which permeate | transmits the wavelength conversion layer 2 without being scattered by the wavelength conversion substance, is ensured enough, and the emitted light quantity from the light-emitting device A is made high enough. The emission color can be adjusted by changing the ratio between the wavelength conversion section 3 and the transparent section 4 within this range.

  According to the present invention, by providing a wavelength conversion section in the wavelength conversion layer, the hue of the emission color can be changed, and light having a hue different from the emission color from the light emitting element can be emitted from the light emitting device, and By providing the transparent section, it is possible to secure the amount of light transmitted through the wavelength conversion layer, thereby improving the light extraction efficiency from the light emitting device.

  Hereinafter, the best mode for carrying out the present invention will be described.

  A light emitting device A shown in FIG. 1A can be configured by providing a light emitting element 1 and a wavelength conversion layer 2 on a substrate 10.

  As the substrate 10, an appropriate one can be applied. For example, a resin substrate or a ceramic substrate can be used.

  Moreover, although the appropriate thing can be used also as the light emitting element 1, an LED chip etc. can be used, for example.

  One or a plurality of the light emitting elements 1 are mounted on the substrate 10. In the illustrated example, the recess 11 is formed on one surface of the substrate 10, and the light emitting element 1 is mounted on the bottom thereof. In addition, conductor wiring for supplying power to the light emitting element 1 and transmitting control signals is formed on the substrate 10 as necessary.

  The wavelength conversion layer 2 is disposed on the light extraction direction side with respect to the light emitting element 1. In the example shown in the figure, an arrangement portion 12 having a larger opening diameter is provided on the opening side of the recess 11 in the substrate 10, and the wavelength conversion layer 2 is provided in the arrangement portion 12.

  The wavelength conversion layer 2 has a wavelength conversion section 3 and a transparent section 4. The wavelength conversion section 3 and the transparent section 4 are sections divided in a direction orthogonal to or intersecting with the light extraction direction from the light emitting element 1, in the illustrated example, the surface direction of the wavelength conversion layer 2.

The wavelength conversion section 3 contains a wavelength conversion substance that converts the wavelength of light emitted from the light emitting element 1. As the wavelength converting substance, a phosphor or the like that absorbs light emitted from the light emitting element 1 and emits light having a wavelength different from the light can be used. The wavelength converting substance is appropriately selected according to the wavelength of light emitted from the light emitting element 1 or the color of light emission required for the light emitting device A. For example, the light emitting element 1 has an emission peak wavelength of 450. In the case of using a blue LED having a wavelength of about 470 nm, yellow light emission is generated using yttrium / aluminum / garnet phosphor (YAG: Ce) activated with cerium, or the YAG: Ce and europium are added. When an activated calcium sulfide phosphor (CaS: Eu) is used, red light emission can be generated, and when the near-ultraviolet-violet LED having an emission peak wavelength of about 365 to 410 nm is used as the light-emitting element 1 Produces blue light emission using BaMgAl10017Eu (BAM) or green light emission using ZnS: Cu, Al. Or causing, Y ₂ O ₂ S: with Eu or can cause red emission. When a plurality of wavelength conversion materials are used, the wavelength conversion section 3 may be formed of a mixture of the plurality of wavelength conversion materials, and a plurality of wavelengths having different types and contents of wavelength conversion materials. A conversion section 3 may be provided.

  On the other hand, the transparent section 4 is capable of transmitting light emitted from the light emitting element 1 and does not include a wavelength conversion substance, or even when it includes a wavelength conversion substance, its content is less than that of the wavelength conversion section 3. is there.

  Said wavelength conversion division 3 can be comprised in the wavelength conversion phase 5 containing a wavelength conversion substance. The wavelength conversion phase 5 may be composed of only the wavelength conversion material, or may be configured by dispersing the wavelength conversion material in a matrix that can transmit light emitted from the light emitting element 1. Examples of the parent phase include a molded body of transparent resin such as glass, epoxy resin, silicone resin, silicone rubber, and acrylic resin.

  Further, the wavelength conversion section 3 may be composed of only the wavelength conversion phase 5 as described above, and the wavelength conversion phase 5 and the transparent phase 6 are laminated in the light extraction direction from the light emitting element 1. May be configured. The transparent phase 6 here is a phase that can transmit the light emitted from the light emitting element 1 and does not contain the wavelength conversion substance or has a smaller content of the wavelength conversion substance than the wavelength conversion phase 5. The transparent phase 6 can be formed of a molded body of transparent resin such as glass, epoxy resin, silicone resin, silicone rubber, acrylic resin, or the like.

  The content of the wavelength conversion substance in the wavelength conversion section 3 and the wavelength conversion phase 5 varies depending on the conversion efficiency, emission color, etc. of the wavelength conversion substance used, and thus cannot be defined unconditionally. When using an LED and using a YAG: Ce phosphor as the wavelength conversion material, the content of the wavelength conversion material in the wavelength conversion section 3 in the wavelength conversion layer 2 when the thickness of the wavelength conversion layer 2 is 0.5 mm The average is preferably adjusted to be in the range of 20 to 40% by mass.

  Moreover, it is preferable that the transparent section 4 does not contain a wavelength converting substance. However, when the transparent section 4 contains a wavelength converting substance, the projected area of the wavelength converting substance in the transparent section 4 in the light extraction direction from the light emitting element 1. The hit content is preferably 50% or less of the content in the wavelength conversion section 3. At this time, in the case where a plurality of types having different wavelength conversion substance contents are provided as the wavelength conversion section 3, it is preferably 50% or less based on the average value of the contents.

  Further, it is preferable that the transparent phase 6 does not contain a wavelength converting substance. However, when the transparent phase 6 contains a wavelength converting substance, the content per volume of the wavelength converting substance in the transparent phase 6 is contained in the wavelength converting phase 5. The amount is preferably 50% or less. At this time, when a plurality of types having different wavelength conversion substance contents are provided as the wavelength conversion phase 5, it is preferably 50% or less based on the average value of the contents.

  Further, the transparent section 4 can be composed of only the transparent phase 6.

  When the wavelength conversion layer 2 is configured by the wavelength conversion section 3 and the transparent section 4 as described above, when the light emitted from the light emitting element 1 is extracted to the outside through the wavelength conversion layer 2, the light passes through the wavelength conversion layer 2. At the time of transmission, a part of the light is transmitted through the wavelength conversion section 3, and a part of the light is converted by the wavelength conversion material and taken out to the outside. The other part of the light passes through the transparent section 4 or is incident on the wavelength conversion section 3 from the interface between the transparent section 4 and the wavelength conversion section 3 via the transparent section 4 and then extracted outside. . As a result, the light that has been transmitted through the wavelength conversion layer 2 includes light that has been wavelength-converted by the wavelength conversion substance, and light having a color different from the light emission color of the light-emitting element 1 is emitted from the light-emitting device A to the outside. Can be emitted.

  At this time, the light transmitted through the transparent section 4 is less likely to be scattered by the wavelength converting material than when transmitted through the wavelength converting section 3, and particularly when the transparent section 4 contains no wavelength converting substance, the light is transmitted by the wavelength converting substance. As a result, scattering does not occur, and light scattering in the wavelength conversion layer 2 can be reduced as compared with the case where the wavelength conversion material is dispersed throughout the wavelength conversion layer 2. That is, by changing the hue of the emission color by providing the wavelength conversion section 3, it is possible to secure the amount of light transmitted through the wavelength conversion layer 2 by providing the transparent section 4. It is possible to improve the extraction efficiency.

  Hereinafter, more specific embodiments will be described.

  In the embodiment shown in FIGS. 1B and 1C, a plurality of wavelength conversion members 13 formed only from the wavelength conversion phase 5 and a plurality of transparent members 14 formed only from the transparent phase 6 are respectively provided. The wavelength conversion layer 2 is formed by forming a planar (rectangular) plate-like body in plan view and joining the end faces of these members. As a result, the wavelength conversion section 13 composed only of the wavelength conversion phase 5 is formed in the wavelength conversion member 13, and the transparent section 4 composed only of the transparent phase 6 is formed in the transparent member 14, and this The wavelength conversion section 3 and the transparent section 4 are arranged in a planar shape. At this time, by forming the wavelength conversion member 13 and the transparent member 14 in the same shape, the wavelength conversion layer 2 is arranged in an appropriate layout so that the ratio of the wavelength conversion section 3 and the transparent section 4 becomes desired. Can be formed. For example, the wavelength conversion section 3 and the transparent section 4 can be arranged in a checkered pattern, or the ratio of the wavelength conversion section 3 or the transparent section 4 can be further reduced.

  In the present embodiment, the wavelength conversion phase 5 constituting the wavelength conversion member 13 and the wavelength conversion section 3 is formed by dispersing a wavelength conversion substance in a matrix such as glass or transparent resin. Moreover, the transparent phase 6 which comprises the transparent member 14 and the transparent division 4 is formed, for example with glass or transparent resin, or the wavelength conversion substance is disperse | distributed and contained by this in less content than the wavelength conversion phase 5.

  In the embodiment shown in FIGS. 2 (a) and 2 (b), a plurality of wavelength conversion members 13 formed only of the wavelength conversion phase 5 with respect to the flat transparent member 14 formed of only the transparent phase 6. Are partially laminated and joined to form the wavelength conversion layer 2. As the wavelength conversion member 13 and the transparent member 14, those formed of the same material as the embodiment shown in FIGS. 1B and 1C can be used. At this time, the section in which the wavelength conversion member 13 is laminated on the transparent member 14 in the wavelength conversion layer 2 is formed as the wavelength conversion section 3 configured by laminating the transparent phase 6 and the wavelength conversion phase 5, and the wavelength A section where the conversion member 13 is not laminated is formed as a transparent section 4 composed of only the transparent phase 6.

  In the case of forming such a wavelength conversion layer 2, for example, a plurality of wavelength conversion members 13 formed of a plate-like body having a rectangular shape (square shape) in plan view with respect to the transparent member 14 are replaced with the wavelength conversion section 3. And the transparent sections 4 can be arranged and joined in an appropriate layout so that the ratio between them and the transparent section 4 becomes a desired one. For example, as shown in the figure, they can be arranged in a checkered pattern and bonded to the transparent member 14, or the ratio of the wavelength conversion member 13 can be further increased or decreased.

  Moreover, as shown in FIG. 2, the transparent member 14 and the wavelength conversion member 13 are laminated as compared with the case where the end faces of the members are joined to each other as in the embodiment shown in FIGS. Joining to each other facilitates the joining work between the members and improves productivity.

  In the embodiment shown in FIGS. 3A and 3B and FIGS. 4A and 4B, a plurality of recesses 8 are formed in a flat transparent member 14 (base material 7) composed of only the transparent phase 6. The wavelength conversion layer 2 is formed by filling the recess 8 with a wavelength conversion substance. As the base material 7, the same material as the transparent member 14 in the above-described embodiment can be used. At this time, a section in the wavelength conversion layer 2 where the concave portion 8 is not formed, that is, a section not filled with the wavelength conversion substance, is formed as the transparent section 4 including only the transparent phase 6. Further, in the section where the recess 8 is formed, the wavelength conversion phase 5 is formed by the wavelength conversion material filled in the recess 8, and thereby the wavelength conversion section configured by laminating the wavelength conversion phase 5 and the transparent phase 6. 3 is formed.

  When the wavelength conversion layer 2 is formed in the present embodiment, the concave portions 8 are formed in an appropriate layout with respect to the base material 7 so that the ratio of the wavelength conversion section 3 and the transparent section 4 is a desired one. Thus, the wavelength conversion phase 5 can be formed in an appropriate layout at the location where the recess 8 is formed. For example, the recesses 8 and the wavelength conversion phases 5 formed in the recesses 8 are formed in a matrix of a plurality of rows and columns with respect to the base material 7 as shown in FIG. 3, or as shown in FIG. It can be formed in a striped pattern.

  In the wavelength conversion layer 2 formed in this way, the wavelength conversion section 3 constituted by the wavelength conversion phase 5 and the transparent phase 6 laminated on the one surface side is formed at the portion where the recess 8 is formed, Moreover, the transparent division 4 comprised only by the transparent phase 6 is formed in the location in which the recessed part 8 is not formed.

  In this way, the wavelength conversion phase 5 can be formed simply by filling the concave portion 8 with the wavelength conversion substance, thereby improving productivity.

  In addition, when the wavelength conversion phase 5 is formed by filling the concave portion 8 of the base material 7 with the wavelength conversion substance in this way, the above is provided on one surface of the base material 7 where the concave portion 8 is open. The wavelength conversion phase 5 (wavelength conversion) exposed to the opening of the concave portion 8 by this lid member 9 is provided by laminating another transparent member 14 (lid member 9) composed of only the transparent phase 6. The exposed portion of the material can be occluded. For example, in the example shown in FIGS. 5 (a) and 5 (b), in the case where the wavelength conversion phase 5 is formed in a matrix as shown in FIG. 3, the base material 7 having the recesses 8 provided with the wavelength conversion phase 5 is provided. The exposed portion of the wavelength conversion phase 5 is blocked by laminating and bonding the lid member 9 over the entire surface where the wavelength conversion phase 5 is exposed. In the wavelength conversion layer 2 formed in this manner, the wavelength conversion section 3 constituted by the wavelength conversion phase 5 and the transparent phase 6 laminated on both sides thereof is formed at the portion where the recess 8 is formed, and the recess A transparent section 4 composed only of the transparent phase 6 is formed at a location where 8 is not formed.

  If it does in this way, the lid member 9 can prevent the wavelength conversion substance filled in the concave portion 8 from being scattered or leaked by the lid member 9, and for this reason, the yield during production can be improved.

  Further, in the embodiment as shown in FIGS. 3A and 3B and FIGS. 4A and 4B, a through portion that penetrates the base material 7 is formed in the base material 7 instead of the recess 8. The wavelength conversion layer 2 can also be formed by filling the penetrating portion with a wavelength conversion substance. In this case, the wavelength conversion layer 2 can be formed in the same manner as shown in FIGS. 3 and 4 except that a through-hole is formed instead of the recess 8.

  In the wavelength conversion layer 2 formed in this way, the wavelength conversion section 3 constituted only by the wavelength conversion phase 5 is formed in the portion where the penetrating portion is formed, and transparent in the portion where the penetrating portion is not formed. A transparent phase 6 composed only of the phase 6 is formed.

  Even in this case, the wavelength conversion phase 5 can be formed only by filling the penetrating portion with the wavelength conversion substance, and the productivity is improved.

  Further, when the wavelength conversion phase 5 is formed by filling the penetrating portion of the base material 7 with the wavelength conversion substance, the transparent phase is respectively formed on both surfaces where the penetrating portion of the base material 7 is open. The wavelength conversion phase 5 (wavelength conversion substance) exposed at the opening of the penetrating portion at the lid member 9 by providing another transparent member 14 (lid member 9) composed of only 6 It is possible to close the exposed portion of the. For example, the wavelength conversion phase 5 is obtained by laminating and bonding the cover members 9 over the entire surfaces of both surfaces where the wavelength conversion phase 5 is exposed, of the base material 7 having a penetrating portion provided with the wavelength conversion phase 5. It is possible to close the exposed portion of the. In the wavelength conversion layer 2 formed in this way, the wavelength conversion section 3 constituted by the wavelength conversion phase 5 and the transparent phase 6 laminated on both sides thereof is formed at the portion where the penetrating portion is formed. A transparent section 4 composed only of the transparent phase 6 is formed at a portion where no part is formed.

  Even in this case, similarly to the case shown in FIG. 5, scattering and leakage of the wavelength conversion substance filled in the penetrating portion can be prevented by the lid member 9, and for that reason, the yield during production can be improved. Is something that can be done.

  By the way, when the wavelength conversion layer 2 having the wavelength conversion section 3 and the transparent section 4 is formed as in each of the above embodiments, the light emitted from the light emitting device A is transmitted through the wavelength conversion section 3 and the transparent section. 4 is mixed with the light transmitted from the light-emitting element 1, so that the light emitted from the light-emitting element 1 is different from the light emitted from the light-emitting element 1. It is preferable that the wavelength conversion section 3 is uniformly dispersed over the entire area. In order to reduce color unevenness, the size of the wavelength conversion section 3 formed in the wavelength conversion layer 2 is preferably set such that the minimum width is preferably 0.1 mm or less. In this way, since the fine wavelength conversion section 3 is dispersed in the wavelength conversion layer 2, the light that has been wavelength-converted by being transmitted through the wavelength conversion section 3 is uniformly dispersed during light emission from the light emitting device A. As a result, color unevenness is remarkably reduced. The lower limit of the dimension of the wavelength conversion section 3 is not particularly limited, and may be any dimension that allows the wavelength conversion section 3 to be formed.

  Further, the ratio of the wavelength conversion section 3 and the transparent section 4 in the wavelength conversion layer 2 is also appropriately adjusted so as to obtain a desired light emission color. Preferably, the light emitting elements of the wavelength conversion section 3 and the transparent section 4 are used. The ratio of the projected areas in the light extraction direction from 1 is set to be in the range of 5: 1 to 1: 5. By doing in this way, sufficient light quantity of the light which permeate | transmits the transparent division 4, ie, the light which permeate | transmits the wavelength conversion layer 2 without receiving the scattering by a wavelength conversion substance, and sufficient light emission quantity from the light-emitting device A is ensured. In this range, the emission color can be adjusted by changing the ratio of the wavelength conversion section 3 and the transparent section 4. That is, a sufficient amount of emitted light can be secured by setting the ratio of the transparent section 4 in the above range, and the light emitted from the light emitting element 1 can be converted in wavelength by setting the ratio of the wavelength conversion section 3 in the above range. When passing through the layer 2, the hue can be sufficiently converted.

  The wavelength conversion layer 2 in the illustrated embodiment of the present invention is formed in a planar shape as a whole, but may be formed in an appropriate shape such as a curved surface.

(A) is sectional drawing which shows an example of the basic composition of a light-emitting device, (b) shows an example of embodiment of this invention, sectional drawing which shows the wavelength conversion layer in the said light-emitting device, (c) is It is a top view of the said wavelength conversion layer. FIG. 8 shows another example of the embodiment of the present invention, in which (a) is a cross-sectional view showing a wavelength conversion layer in the light emitting device shown in FIG. 1 (a), and (b) is a plan view of the wavelength conversion layer. is there. FIG. 3 shows still another example of the embodiment of the present invention, in which (a) is a cross-sectional view showing a wavelength conversion layer in the light emitting device shown in FIG. 1 (a), and (b) is a plan view of the wavelength conversion layer. It is. FIG. 3 shows still another example of the embodiment of the present invention, in which (a) is a cross-sectional view showing a wavelength conversion layer in the light emitting device shown in FIG. 1 (a), and (b) is a plan view of the wavelength conversion layer. It is. FIG. 3 shows still another example of the embodiment of the present invention, in which (a) is a cross-sectional view showing a wavelength conversion layer in the light emitting device shown in FIG. 1 (a), and (b) is a plan view of the wavelength conversion layer. It is.

Explanation of symbols

A light emitting device 1 light emitting element 2 wavelength conversion layer 3 wavelength conversion section 4 transparent section 5 wavelength conversion phase 6 transparent phase 7 base material 8 recess 9 lid member

Claims (6)

  In a light-emitting device including a light-emitting element and a wavelength conversion layer containing a wavelength conversion substance for wavelength-converting light emitted from the light-emitting element, the wavelength conversion layer includes a wavelength conversion section containing a wavelength conversion substance, and A light emitting device comprising: a transparent section having a smaller content of the wavelength converting substance than the wavelength converting section.   The wavelength conversion section is formed by laminating a wavelength conversion phase containing a wavelength conversion substance and a transparent phase containing less wavelength conversion material than the wavelength conversion phase, and the transparent section is only a transparent phase. The light-emitting device according to claim 1, wherein the light-emitting device is formed by:   The wavelength conversion section includes a wavelength conversion phase containing a wavelength conversion substance, and the wavelength conversion phase is provided on a mother base composed of a transparent phase having a smaller wavelength conversion substance content than the wavelength conversion phase. The light emitting device according to claim 1, wherein the concave portion or the through portion is filled with a wavelength converting substance.   The light emitting device according to claim 3, wherein an exposed portion of the wavelength conversion phase at the recess opening in the base material is closed by a lid member formed of a transparent phase.   The light emitting device according to any one of claims 1 to 4, wherein a minimum width dimension of the wavelength conversion section is 0.1 mm or less.   The ratio of the projected area of the wavelength conversion layer to the light extraction direction of the light from the light emitting element between the wavelength conversion section and the transparent section is in the range of 5: 1 to 1: 5. The light emitting device according to any one of 5.

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