TW202002337A - Color conversion element and illumination device - Google Patents

Abstract

A color conversion element (4) is provided with a substrate (41) and a color conversion part (43) disposed on the substrate (41), the color conversion part (43) being provided with a first fluorescent part (44) disposed on the principal surface of the substrate (41), and second fluorescent parts (46) divided at a predetermined interval along the substrate (41) inside the first fluorescent part (44), the first fluorescent part (44) being provided with a first inorganic material (442) including at least a first phosphor (first phosphor particles (441)) for converting light having a predetermined wavelength into light having another wavelength, and the second fluorescent parts (46) including a plurality of second phosphors (second phosphor particles (461)) for converting light having a predetermined wavelength into light having a longer wavelength than the resultant light from the first phosphor.

Description

Color conversion element and lighting device

The present invention relates to a color conversion element in which a phosphor layer is laminated on a substrate, and a lighting device provided with the color conversion element.

A lighting device is known, which irradiates laser light transmitted by a light guide member as excitation light to a color conversion element laminated with a fluorescent part to cause the fluorescent part to emit light and convert it into a desired light color. Perform lighting. In recent years, a color conversion element has also been developed, which contains phosphor particles emitting light of different wavelengths in a resin and is formed by separately laminating layers (for example, refer to Patent Document 1). [Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-65142

[Problems to be solved by invention]

In addition, for example, since the directivity and excitation density of blue laser light are high, when the blue laser light is irradiated to the fluorescent portion, the resin bound to the phosphor particles may be deteriorated by the heat. The deterioration of the resin makes the fluorescent part itself unstable, and as a result, the chromaticity of the light emitted is reduced.

Therefore, the object of the present invention is to suppress the decrease in the chromaticity of the light emitted. [Method of solving the problem]

The color conversion element according to an aspect of the present invention includes: a substrate; and a color conversion portion disposed on the substrate. The color conversion portion includes: a first fluorescent portion disposed on the main surface of the substrate; and a second fluorescent portion, Within the first fluorescent part, it is divided at predetermined intervals along the substrate. The first fluorescent part includes a first inorganic material including at least a first that converts light of a predetermined wavelength into light of another wavelength For the phosphor, the second phosphor part includes a plurality of second phosphor particles that convert light of a predetermined wavelength into light having a longer wavelength than the first phosphor.

An illuminating device according to an aspect of the present invention includes: the color conversion element; and a light source section that emits light of a predetermined wavelength irradiated to the color conversion element. [Effect of the invention]

According to the present invention, it is possible to suppress a decrease in the chromaticity of light emitted.

Hereinafter, a lighting device and a color conversion element according to an embodiment of the present invention will be described using drawings. In addition, the embodiments described below are preferred specific examples of the present invention. Therefore, the numerical values, shapes, materials, constituent elements, arrangement, and connection forms of the constituent elements shown in the following embodiments are only examples, and the intention is not to limit the present invention. Therefore, among the constituent requirements in the following embodiments, the constituent requirements that are not described in the independent request item representing the highest concept are described as arbitrary constituent elements.

In addition, the figures are schematic diagrams, not necessarily rigorous illustrations. In each figure, the same reference numerals are assigned to the same components.

[Embodiment 1] First, the lighting device of the first embodiment will be described. FIG. 1 is a schematic diagram of the schematic configuration of the lighting device 1 according to the first embodiment.

As shown in FIG. 1, the lighting device 1 includes a light source unit 2, a light guide member 3 and a color conversion element 4.

The light source unit 2 is a device that generates light of a predetermined wavelength and supplies the light to the color conversion element 4 via a light guide member 3 such as an optical fiber. For example, the light source unit 2 is a semiconductor laser element that emits blue laser light L having a blue-violet to blue (430-490 nm) wavelength.

The color conversion element 4 is a blue laser light L transmitted from the light guide member 3 and irradiated from the surface side of the color conversion element 4 as excitation light, and emits white light to the light emitting element on the surface side.

Hereinafter, the color conversion element 4 will be described in detail. 2 is a cross-sectional view of the schematic configuration of the color conversion element 4 according to the first embodiment. Specifically, FIG. 2 is a cross-sectional view of the color conversion element 4 viewed from a direction perpendicular to the normal line of the substrate 41. As shown in FIG. 2, the color conversion element 4 includes a substrate 41, a bonding portion 42, a reflection portion 45 and a color conversion portion 43. In the color conversion element 4, the substrate 41, the bonding portion 42, the reflection portion 45, and the color conversion portion 43 are laminated in this order.

The substrate 41 is a substrate having a rectangular or circular shape in plan view, for example. Furthermore, the substrate 41 is a substrate having a thermal conductivity higher than that of the color conversion part 43. Thereby, the heat conducted from the color conversion part 43 can be efficiently dissipated from the substrate 41. Specifically, the substrate 41 is formed of a metal material such as Cu and Al. In addition, the substrate 41 only needs to be higher in thermal conductivity than the color conversion portion 43, and may be formed of materials other than metal materials. Examples of materials other than metal materials include ceramics, glass, and sapphire. Examples of ceramics include silicon nitride and aluminum nitride. In addition, in order to further improve heat dissipation, a heat sink such as a mirror heat sink may be installed on the substrate 41.

The bonding portion 42 is an adhesive layer provided between the substrate 41 and the reflection portion 45 for bonding the substrate 41 and the reflection portion 45. The joint 42 is formed of, for example, an adhesive made of resin. In addition, the bonding portion may be a bonding portion for metal nano-bonding the color conversion portion 43 and the substrate 41. In this case, the bonding portion is formed of a metal material that can be applied with metal nano-bonding. For example, the bonding portion is formed by sintering metal nanoparticles. Examples of metal nanoparticles include silver nanoparticles and copper nanoparticles. When silver nanoparticles, copper nanoparticles, etc. are used, they are easy to obtain and excellent in heat dissipation. If the joining portion is formed of a metal material, since the joining portion itself reflects light, the reflecting portion 45 can be omitted.

The reflection part 45 is interposed between the junction part 42 and the color conversion part 43. The reflection portion 45 is formed in advance on the main surface of the color conversion portion 43 on the substrate 41 side. The reflection part 45 is a reflection film that reflects the light emitted from the color conversion part 43. The reflecting section 45 is, for example, an antireflection coating for adjusting the refractive index, a dichroic mirror, and the like. The reflection portion 45 is formed of a metal material such as Au, Ag, Ni, Pd, Ti, or a SiO ₂ /TiO ₂ laminate. The reflecting portion 45 is formed by forming a film such as a metal material on the main surface of the color conversion portion 43 on the substrate 41 side by a film forming method such as sputtering or electroplating.

The color conversion portion 43 is disposed on the main surface side of the substrate 41. The plan view shape of the color conversion portion 43 is formed in the same shape as the substrate 41. In addition, the color conversion unit 43 is provided with particles of phosphors (first phosphor particles 441, second phosphor particles 461) excited by laser light to emit fluorescence in a dispersed state, with blue laser light With the irradiation of L, the first phosphor particles 441 and the second phosphor particles 461 emit fluorescence. These fluorescent lights are mixed with the blue laser light L, and are emitted from the main surface outside the color conversion portion 43. Therefore, the main surface outside the color conversion portion 43 is a light-emitting surface.

Specifically, the color conversion part 43 includes a first fluorescent part 44 and a second fluorescent part 46.

The first fluorescent portion 44 is a layer disposed on the main surface side of one side of the substrate 41. Specifically, the first fluorescent portion 44 is a layer directly superimposed on the reflection portion 45. In the first fluorescent portion 44, a concave portion 443 is formed on the main surface of the substrate 41 side.

FIG. 3 is a cross-sectional view of the cross section including the line III-III of FIG. 2. As shown in FIG. 3, in a cross-sectional view seen from the normal direction of the substrate 41, a lattice-like recess 443 is formed on the main surface of the first fluorescent portion 44 on the substrate 41 side. The concave portion 443 is formed by performing groove processing, such as cutting processing, on the first fluorescent portion 44 having a uniform thickness before processing. In addition, the concave portion 443 may not be lattice-shaped, and may be, for example, a stripe shape or a multiple ring shape. The second fluorescent portion 46 is filled in the concave portion 443.

The first fluorescent portion 44 uses a light-transmissive first inorganic material 442 as a binding material, and includes a plurality of first phosphor particles 441 in a dispersed state. As a result, in the first fluorescent portion 44, the plurality of first fluorescent particles 441 are solidified by the first inorganic material 442. That is, the first phosphor part 44 includes the first inorganic material 442 including at least the first phosphor particles 441 as the first phosphor. The first phosphor particles 441 are phosphor particles that convert light of a predetermined wavelength into light of other wavelengths. Specifically, the first phosphor particles 441 are phosphor particles that emit yellow light by being irradiated with blue laser light L. For the first phosphor particles 441, for example, yttrium, aluminum, garnet (YAG) based phosphor particles are used.

The second fluorescent portion 46 is filled in the concave portion 443 of the first fluorescent portion 44. In addition, when viewed from the normal direction of the substrate 41 as shown in FIG. 3, the entire second fluorescent portion 46 is a single member, but in a predetermined portion, the second fluorescent portion 46 appears to be along the substrate 41 It is divided at predetermined intervals (refer to FIG. 2). In this case, the second fluorescent portion 46 is set to be divided at predetermined intervals along the substrate 41. That is, although the second fluorescent portion 46 is a single member as a whole, it can be partially divided as viewed in the cross section shown in FIG. 2.

The second fluorescent portion 46 uses a light-transmissive second inorganic material 462 as a bonding material, and includes a plurality of second phosphor particles 461 in a dispersed state. As a result, in the second fluorescent portion 46, the plurality of second fluorescent particles 461 are solidified by the second inorganic material 462. That is, the second fluorescent part 46 includes the second inorganic material 462 including at least the second fluorescent particle 461 as the second fluorescent body. The second phosphor particles 461 are phosphor particles that convert light of a predetermined wavelength into light having a longer wavelength than the first phosphor particles 441. Specifically, the second phosphor particles 461 are phosphor particles that emit red light by being irradiated with blue laser light L. The second phosphor particles 461 are, for example, CASN or SCASN phosphor (phosphor with a basic composition of (Sr, CA) AlSiN ₃ :Eu, etc.) particles.

In addition, the first fluorescent portion 44 and the second fluorescent portion 46 may each include a polycrystalline body or a single crystal body made of one type of fluorescent body. In this case, multiple crystals or single crystals can be used as the phosphor particles.

In addition, as the first inorganic material 442 and the second inorganic material 462, for example, SiO ₂ -based glass and a transparent ceramic containing alumina are exemplified. The first inorganic material 442 and the second inorganic material 462 may be the same inorganic material or different inorganic materials.

[Operation of lighting device] Next, the operation of the lighting device 1 will be described.

When the blue laser light L is irradiated from the light source part 2 through the light guide member 3 to the color conversion part 43 of the color conversion element 4, it enters the first fluorescent part 44. The blue laser light L entering a part of the first fluorescent portion 44 hits the first fluorescent particle 441 and is converted into yellow light. At this time, although the first fluorescent portion 44 is elevated in temperature, since the first inorganic material 442 having higher heat resistance than the resin is used as the bonding material, the influence is small. That is, the first fluorescent portion 44 can maintain stable color conversion performance for a long time.

The other blue laser light L entering the first fluorescent part 44 enters the second fluorescent part 46. The blue laser light L that has entered the second fluorescent portion 46 touches the second fluorescent particle 461 and is converted into red light. At this time, although the second fluorescent portion 46 is heated up, since the second inorganic material 462 having higher heat resistance than the resin is used as the bonding material, the influence is small. That is, the second fluorescent portion 46 can also maintain stable color conversion performance for a long time.

In addition, the second fluorescent portion 46 is divided along the substrate 41 at a predetermined interval, and the first fluorescent portion 44 is disposed within this interval. In this way, since the first fluorescent portion 44 and the second fluorescent portion 46 are discretely arranged along the substrate 41, the blue laser light L with high directivity can be diffused in the color conversion portion 43 while performing color conversion.

In addition, the reflecting portion 45 reflects yellow light, red light, and blue laser light L to the light emitting surface side. Among these reflected lights, some light is subjected to color conversion by touching the first phosphor particles 441 or the second phosphor particles 461 until they are emitted from the light emitting surface.

In addition, in the blue laser light L, those that do not touch the first phosphor particles 441 and the second phosphor particles 461 are maintained as the blue laser light L and are emitted to the outside.

The blue laser light L, yellow light, and red light are emitted from the color conversion part 43 to the outside, and these lights are mixed to emit white light with high color rendering properties. As described above, the first fluorescent portion 44 and the second fluorescent portion 46 that are discretely arranged along the substrate 41 diffuse the blue laser light L in the color conversion portion 43, so the white light is also uniformized in the color conversion portion 43 as a whole .

Here, light with a shorter wavelength has a property of being easily absorbed by a phosphor converted into light with a longer wavelength. That is, in the case of this embodiment, yellow light is easily absorbed by the second phosphor particles 461. For example, suppose that the concave portion 443 of the first fluorescent portion 44 is provided on the light emitting surface side, and the second fluorescent portion 46 is filled in the concave portion 443. In this case, there may be a second fluorescent part 46 on the optical path from the first fluorescent part 44 to the light emitting surface. Therefore, the yellow light emitted from the first fluorescent part 44 is more likely to pass through the second fluorescent part 46 before reaching the light emitting surface. The yellow light is converted into red light by touching the second phosphor particles 461 through the second fluorescent portion 46. This is the so-called "secondary absorption" phenomenon. If secondary absorption occurs, the color balance may collapse and the desired white light may not be obtained.

In this embodiment, a recessed portion 443 is provided on the main surface of the first fluorescent portion 44 on the substrate 41 side, and the second fluorescent portion 46 is filled in the recessed portion 443. Due to such an arrangement, the second fluorescent portion 46 is unlikely to exist on the optical path from the first fluorescent portion 44 to the light emitting surface. Therefore, the yellow light emitted from the first fluorescent portion 44 is less likely to pass through the second fluorescent portion 46 before reaching the light emitting surface, so that the occurrence of secondary absorption can also be suppressed. This makes it easy to obtain the desired white light.

[[Effect of the effect, [effect, etc., [effect, effect, etc.] [acting effect, etc.] [[effect, effect, etc.] [[effect, effect, etc.] [[effect]] As described above, the color conversion element 4 of the present embodiment includes: the substrate 41; and the color conversion portion 43 disposed on the substrate 41. The color conversion portion 43 includes the first fluorescent portion 44 disposed on the main surface of the substrate 41 ; And the second fluorescent portion 46, within the first fluorescent portion 44 is divided at predetermined intervals along the substrate 41, the first fluorescent portion 44 includes at least a first wavelength of light of a predetermined wavelength is converted into other wavelengths of light A first inorganic material 442 of a phosphor (first phosphor particles 441), the second phosphor portion 46 includes a second that converts light of a predetermined wavelength into light having a longer wavelength than the first phosphor particles 441 Phosphor (second phosphor particles 461).

In addition, the lighting device 1 of the present embodiment includes the above-described color conversion element 4 and the light source section 2 that emits light of a predetermined wavelength irradiated to the color conversion element 4.

Thereby, in the first fluorescent part 44, since the first fluorescent body includes the first inorganic material 442 having higher heat resistance than the resin, the first fluorescent part can be made compared with the case of using resin as the bonding material 44 stable. Therefore, it is possible to suppress the decrease in the chromaticity of the light emitted.

In addition, the second fluorescent portion 46 is divided along the substrate 41 at a predetermined interval. Since the first fluorescent portion 44 is disposed within this interval, the first fluorescent portion 44 and the second fluorescent portion 46 are along The substrate 41 is discretely arranged. Therefore, the blue laser light L with high directivity can be color-converted while being diffused in the color conversion portion 43, and white light can be emitted uniformly throughout the color conversion portion 43. In addition, the blue laser light L diffuses in the color conversion portion 43, thereby further suppressing the influence of the heat caused by the blue laser light L on the first fluorescent portion 44 and the second fluorescent portion 46.

In addition, the second fluorescent portion 46 includes a second inorganic material 462 that solidifies a plurality of second phosphor particles 461.

As a result, in the second fluorescent portion 46, since the second inorganic material 462 having higher heat resistance than the resin solidifies the plural second phosphor particles 461, it is compared with the case where the resin is used as the bonding material , The second fluorescent part 46 can be stabilized. Therefore, it is possible to suppress the decrease in the chromaticity of the light emitted. In addition, in the second fluorescent portion 46, resin may be used as a bonding material.

In addition, the first fluorescent portion 44 forms a concave portion 443 on the main surface of the substrate 41 side, and fills the second fluorescent portion 46 into the concave portion 443.

As a result, a recessed portion 443 is provided on the main surface of the first fluorescent portion 44 on the substrate 41 side. Since the second fluorescent portion 46 is filled in the recessed portion 443, the first fluorescent portion 44 is moved to the light emitting surface On the optical path, the second fluorescent portion 46 is not easily stored. Therefore, since the yellow light emitted from the first fluorescent portion 44 does not easily pass through the second fluorescent portion 46 until reaching the light emitting surface, the occurrence of secondary absorption can also be suppressed. This makes it easy to obtain the desired white light.

In addition, on the main surface of the first fluorescent portion 44 on the substrate 41 side, the second fluorescent portion 46 does not exist outside the concave portion 443. That is, in this part, the second fluorescent part 46 is not interposed between the first fluorescent part 44 and the substrate 41. In general, for example, a fluorescent part containing red phosphor particles (corresponding to the second fluorescent part 46 in this embodiment) is compared to a fluorescent part containing yellow phosphor particles (in this embodiment Equivalent to the first fluorescent part 44), its heat dissipation is low, if the second fluorescent part 46 is not interposed between the first fluorescent part 44 and the substrate 41, then the first fluorescent part 44 The heat of is smoothly transmitted to the substrate 41. Therefore, the temperature increase of the color conversion portion 43 can be further suppressed.

In addition, the reflection portion 45 is laminated on the main surface of the color conversion portion 43 on the substrate 41 side.

For example, when a resin adhesive layer is laminated on the main surface of the color conversion portion 43 on the substrate 41 side, there is a possibility that light leaks from the adhesive layer. In this embodiment, since the reflecting portion 45 is directly laminated on the main surface of the color conversion portion 43 on the substrate 41 side, the light reaching the main surface of the color conversion portion 43 on the substrate 41 side can be passed through the reflecting portion 45 Reflects into the color conversion part 43. Therefore, the leakage light can be more suppressed, and the output of white light can be suppressed from decreasing.

[Modification 1] In the first embodiment, the case where the second fluorescent portion 46 is disposed in the concave portion 443 is taken as an example. The concave portion 443 is formed by applying groove processing to the first fluorescent portion 44 having an equal thickness before processing. However, the method of forming the recess may be any method. In this modification 1, the case where the concave portion 443a is formed by performing hole processing on the first fluorescent portion 44a will be described. In the following description, the same parts as those in the first embodiment described above may be given the same symbols and their descriptions may be omitted.

4 is a cross-sectional view of the color conversion portion 43a of Modification 1. Specifically, FIG. 4 corresponds to FIG. 3. As shown in FIG. 4, in a cross-sectional view seen from the normal direction of the substrate 41, a plurality of concave portions 443 a arranged in a matrix are formed on the main surface of the first fluorescent portion 44 a on the substrate 41 side. The concave portion 443a is formed by performing hole processing such as masking or hole processing on the first fluorescent portion 44a having an equal thickness as a whole. Masking includes masking using, for example, a metal mask or photoresist printing. Hole drilling includes sandblasting and etching.

By filling the concave portion 443a with the second inorganic material 462 containing a plurality of second phosphor particles 461, the second fluorescent portion 46a is formed. In FIG. 4, the case where the plan view shape of the second fluorescent portion 46a is a rectangle is exemplified, but the second fluorescent portion 46a may be a polygon other than a rectangle, and may be a circle or an ellipse.

[Modifications 2 and 3] In the first embodiment described above, the case where each of the divided second fluorescent portions 46 is formed into a rectangle when viewed in cross section in FIG. 2 is exemplified. However, the cross-sectional observation shape of the divided second fluorescent portion may be any shape.

FIG. 5 is a cross-sectional view of a schematic configuration of the color conversion element 4B of Modification 2. Specifically, FIG. 5 is a diagram corresponding to FIG. 2. As shown in FIG. 5, in the color conversion portion 43b of the color conversion element 4B, the divided second fluorescent portions 46b each have a triangular shape when viewed in cross section. Specifically, the divided second fluorescent portions 46b each have an equilateral triangle in a cross-sectional view, and are arranged so that the bottom side faces the substrate 41 side. A concave portion 443b corresponding to the second fluorescent portion 46b is formed in the first fluorescent portion 44b of the color conversion portion 43b.

6 is a cross-sectional view of a schematic configuration of a color conversion element 4C of Modification 3. Specifically, FIG. 6 corresponds to FIG. 2. As shown in FIG. 6, in the color conversion portion 43 c of the color conversion element 4C, the divided second fluorescent portions 46 c are each semicircular in cross-sectional view, and are arranged so that the flat portion faces the substrate 41 side. A concave portion 443c corresponding to the second fluorescent portion 46c is formed in the first fluorescent portion 44c of the color conversion portion 43c.

In this manner, according to Modifications 2 and 3, the second fluorescent portions 46b and 46c have a tapered cross-sectional shape that tapers toward the opposite side of the substrate 41.

Since the second fluorescent portions 46b and 46c have a tapered cross-sectional shape toward the opposite side of the substrate 41, the second fluorescent portion 46b can be easily compared to the second fluorescent portion 46 having a rectangular cross-sectional view , 46c is filled into the concave portions 443b, 443c of the first fluorescent portions 44b, 44c.

In addition, in the second fluorescent portion 46 having a rectangular cross-sectional view, the portion receiving the blue laser light L is mainly the front end surface. On the other hand, in the second fluorescent portions 46b and 46c, the portion that mainly receives the blue laser light L is the entire outer surface of the tapered portion. That is, in the second fluorescent portions 46b and 46c, the area of the portion that mainly receives the blue laser light L can be increased compared to the second fluorescent portion 46 that is rectangular when viewed in cross section. Therefore, the irradiation density of the blue laser light L to the second fluorescent portions 46b and 46c can be reduced, and the occurrence of the phenomenon of the brightness saturation of the second fluorescent portions 46b and 46c can be suppressed. The brightness saturation phenomenon of the second fluorescent parts 46b and 46c is one of the reasons for the reduction of the conversion efficiency, the output of white light and the color rendering of white light. By suppressing the occurrence of the brightness saturation phenomenon, the conversion efficiency and white light can be suppressed The output and the color rendering of white light are reduced.

[Modification 4] In the first embodiment described above, the case where the second fluorescent portion 46 is arranged at a position exposed from the main surface on the substrate 41 side in the first fluorescent portion 44 is exemplified. However, as long as the second fluorescent portion is divided at predetermined intervals along the substrate within the first fluorescent portion, it may be arranged at any position.

FIG. 7 is a cross-sectional view of a schematic configuration of a color conversion element 4D according to Modification 4. Specifically, FIG. 7 corresponds to the diagram of FIG. 2. As shown in FIG. 7, in the color conversion portion 43d of the color conversion element 4D, the divided second fluorescent portion 46d is arranged at an intermediate position in the thickness direction of the first fluorescent portion 44d. In addition, the second fluorescent portion may be disposed at a position exposed on the light emitting surface side of the first fluorescent portion.

[Modification 5] In the first embodiment described above, the case where the entire second fluorescent portion 46 is equally divided in a plan view is exemplified. However, the second fluorescent portion may be unevenly divided in a plan view.

FIG. 8 is a cross-sectional view of the schematic configuration of the color conversion element 4E of Modification 5. Specifically, FIG. 8 corresponds to the diagram of FIG. 2. As shown in FIG. 8, in the color conversion part 43e of the color conversion element 4E, the divided second fluorescent part 46e is not arranged in the irradiation range R1, but only arranged in other regions. Here, the irradiation range R1 is a range where the blue laser light L irradiates the color conversion unit 43e. That is, in the irradiation range R1, the installation density of the second fluorescent portion 46e is smaller than in other ranges. In addition, the second fluorescent portion 46e may be provided in the irradiation range R1, but in this case, the installation density of the second fluorescent portion 46e is reduced compared to other ranges. Here, the "installation density" means the ratio of the second fluorescent portion 46e per unit area in a plan view.

In addition, the blue laser light L is irradiated to the irradiation range R1 and is scattered in the color conversion portion 43e. Therefore, a part of the blue laser light L reaches the second fluorescent portion 46e located outside the irradiation range R1 and is converted into red light. Further, the other blue laser light L is converted into yellow light by the first fluorescent portion 44e, and then enters the second fluorescent portion 46e to be converted into red light.

In this manner, the irradiation range R1 of the light of a predetermined wavelength irradiating the color conversion part 43e is smaller than the other ranges, and the installation density of the second fluorescent part 46e is smaller.

As a result, in the irradiation range R1, the installation density of the second fluorescent portion 46e is smaller than in other ranges, so that the second fluorescent portion 46e excited by the blue laser light L can be reduced. Therefore, the irradiation density of the blue laser light L to the second fluorescent portion 46e can be reduced, and the occurrence of the phenomenon of the brightness saturation of the second fluorescent portion 46e can be suppressed.

[Embodiment 2] In addition, the blue laser light has high directivity and excitation density. Therefore, when the blue laser light is irradiated to the phosphor layer, the brightness saturation phenomenon of the red phosphor occurs. The phenomenon of the saturation of the brightness of the red phosphor is one of the reasons that the conversion efficiency, the output of white light, and the color rendering of white light decrease. Therefore, in Embodiment 2, a color conversion element 104 capable of suppressing the reduction in conversion efficiency, the output of white light, and the color rendering of white light by suppressing the occurrence of the saturation phenomenon of the red phosphor will be described.

The color conversion element 104 of the second embodiment will be described in detail below. 9 is a cross-sectional view of the schematic configuration of the color conversion element 104 of the second embodiment. Specifically, FIG. 9 is a cross-sectional view of the color conversion element 104 viewed from a direction perpendicular to the normal of the substrate 141. As shown in FIG. 9, the color conversion element 104 includes a substrate 141, a bonding portion 142 and a color conversion portion 143.

The substrate 141 is a substrate having a rectangular or circular shape in plan view, for example. Furthermore, the substrate 141 is a substrate having a higher thermal conductivity than the color conversion portion 143. Thereby, the heat conducted from the color conversion part 143 can be efficiently dissipated from the substrate 141. Specifically, the substrate 141 is formed of a metal material such as Cu and Al. In addition, the substrate 141 only needs to be higher in thermal conductivity than the color conversion portion 143, and may be formed of materials other than metal materials. Examples of materials other than metal materials include ceramics, glass, and sapphire. Examples of ceramics include silicon nitride and aluminum nitride. In addition, in order to further improve heat dissipation, a heat sink such as a mirror heat sink may be installed on the substrate 141.

A reflective film 1411 is laminated on the main surface on one side of the substrate 141. On this reflective film 1411, the bonding portion 142 and the color conversion portion 143 are sequentially stacked. The reflective film 1411 is a reflective film that reflects the light emitted by the color conversion part 143. The reflection film 1411 is, for example, an antireflection coating for adjusting the refractive index, a dichroic mirror, and the like. The reflective film 1411 is formed of a metal material such as Au, Ag, Ni, Pd, Ti, or a SiO ₂ /TiO ₂ laminate. The reflective film 1411 is formed by forming a metal material film on one main surface of the substrate 141 by a film forming method such as sputtering or electroplating.

The bonding portion 142 is an adhesive layer provided between the color conversion portion 143 and the reflective film 1411 for bonding the color conversion portion 143 and the reflective film 1411. The bonding portion 142 is formed of, for example, an adhesive made of resin. In addition, the bonding portion may be a bonding portion for metal nano-bonding the color conversion portion 143 and the substrate 141. In this case, the bonding portion is formed of a metal material that can be applied with metal nano-bonding. For example, the bonding portion is formed by sintering metal nanoparticles. Examples of metal nanoparticles include silver nanoparticles and copper nanoparticles. When using silver nanoparticles, copper nanoparticles, etc., it is easy to obtain and excellent in heat dissipation. If the bonding portion is formed of a metal material, since the bonding portion itself reflects light, the reflective film 1411 can be omitted.

The color conversion portion 143 is disposed on the main surface side of one side of the substrate 141. The planar shape of the color conversion portion 143 is formed in the same shape as the substrate 141. In addition, the color conversion unit 143 is provided with particles of phosphors (red phosphor particles 1441, yellow phosphor particles 1461) excited by laser light to emit fluorescence in a dispersed state. Upon irradiation, the red phosphor particles 1441 and the yellow phosphor particles 1461 emit fluorescent light. These fluorescent lights are mixed with blue laser light L to become white light. White light is emitted from the main surface outside the color conversion portion 143. Therefore, the main surface outside the color conversion portion 143 is a light-emitting surface.

Specifically, the color conversion section 143 includes a red fluorescent section 144, a reflection section 145, and a yellow fluorescent section 146.

The red fluorescent portion 144 directly overlaps the layer of the bonding portion 142. The red fluorescent part 144 is an example of the second fluorescent part. The red fluorescent part 144 uses a light-transmitting inorganic material or a light-transmitting resin material as a binding material, and has a plurality of red phosphor particles 1441 in a dispersed state. Examples of the translucent inorganic material include glass and transparent ceramics. Examples of the light-transmitting resin material include silicone resin, epoxy resin, urea resin, and the like. The red phosphor particles 1441 are phosphor particles that emit red light by being irradiated with yellow light. For the red phosphor particles 1441, for example, CASN or SCASN phosphor (phosphor with a basic composition of (Sr, CA) AlSiN ₃ :Eu, etc.) particles are used.

The reflecting portion 145 is a layer that reflects blue laser light L and transmits yellow light and red light. The reflection part 145 is disposed on the opposite side of the substrate 141 in the red fluorescent part 144. Specifically, the reflecting portion 145 directly overlaps the main surface on the opposite side of the red fluorescent portion 144 so as to cover the entire main surface on the opposite side of the substrate 141 in the red fluorescent portion 144. The reflecting section 145 is, for example, an antireflection coating for adjusting the refractive index, a dichroic mirror, and the like. The reflection portion 145 is formed of a metal material such as Au, Ag, Ni, Pd, Ti, or a SiO ₂ /TiO ₂ laminate.

The yellow fluorescent part 146 directly overlaps the layer of the reflecting part 145. The yellow fluorescent part 146 is an example of the first fluorescent part. The yellow fluorescent portion 146 uses a light-transmitting inorganic material or a light-transmitting resin material as a binding material, and has a large number of yellow phosphor particles 1461 in a dispersed state. The yellow phosphor particles 1461 are phosphor particles that emit yellow light by being irradiated with blue laser light L. For the yellow phosphor particles 1461, for example, yttrium, aluminum, garnet (YAG) based phosphor particles are used.

In addition, the red fluorescent part 144 and the yellow fluorescent part 146 may each be a polycrystalline body or a single crystal made of one type of fluorescent body.

[Operation of lighting device] Next, the operation of the lighting device 1 will be described.

When the blue laser light L is irradiated from the light source part 2 through the light guide member 3 to the color conversion part 143 of the color conversion element 104, it enters the yellow fluorescent part 146. A part of the blue laser light L entering the yellow fluorescent part 146 touches the yellow phosphor particles 1461, and the other blue laser light L is reflected by the reflecting part 145. Among the reflected blue laser light L, part of the blue laser light L hits the yellow phosphor particles 1461, and the other blue laser light L is emitted from the yellow fluorescent part 146 to the outside.

The blue laser light L that hits the yellow phosphor particles 1461 is converted into yellow light by the yellow phosphor particles 1461. Among the converted yellow light, part of the yellow light passes through the reflecting portion 145 and enters the red fluorescent portion 144, and the other yellow light is emitted from the yellow fluorescent portion 146 to the outside.

The yellow light transmitted through the reflecting portion 145 enters the red fluorescent portion 144. The yellow light entering a part of the red fluorescent portion 144 hits the red phosphor particles 1441, and the other yellow light is reflected by the reflective film 1411 through the bonding portion 142. Among the reflected yellow light, a part of the yellow light hits the red phosphor particles 1441, and the other yellow light is emitted to the outside through the reflecting portion 145 and the yellow fluorescent portion 146.

The yellow light that hits the red phosphor particles 1441 is converted into red light by the red phosphor particles 1441. A part of the converted red light is directly emitted to the outside through the reflection part 145 and the yellow fluorescent part 146. On the other hand, the other part of the converted red light is reflected to the reflective film 1411 through the bonding portion 142, and is indirectly emitted to the outside through the reflective portion 145 and the yellow fluorescent portion 146. In this way, the red phosphor particles 1441 of the red phosphor portion 144 are excited by yellow light and emit red light. That is, the red phosphor particles 1441 are not excited by the blue laser light L. As a result, the occurrence of the phenomenon of brightness saturation of the red phosphor particles 1441 can be suppressed.

In this way, blue laser light L, yellow light, and red light are emitted from the color conversion part 143 to the outside, and these lights are mixed to emit white light with high color rendering properties.

[[Effect of the effect, [effect, etc., [effect, effect, etc.] [acting effect, etc.] [[effect, effect, etc.] [[effect, effect, etc.] [[effect]] As described above, the color conversion element 104 of this embodiment includes: the substrate 141; the color conversion section 143, which is disposed on the substrate 141, receives blue laser light L from the outside and converts it into white light, and the color conversion section 143 includes: red The fluorescent part 144 is arranged on the main surface of the substrate 141 and emits red light by irradiating yellow light; the reflecting part 145 is arranged on the opposite side of the substrate 141 in the red fluorescent part 144 and covers the red fluorescent part 144 ; And the yellow fluorescent portion 146, in a manner to cover the reflective portion 145, is disposed on the opposite side of the red fluorescent portion 144 in the reflective portion 145, by emitting blue laser light L to emit yellow light, the reflective portion 145 Reflects blue laser light L, and transmits yellow light and red light.

In addition, the lighting device 1 of the present embodiment includes the color conversion element 104 described above; and the light source section 2 that emits blue laser light L irradiated to the color conversion element 104.

As a result, the reflecting portion 145 reflects the blue laser light L and transmits yellow light and red light. Therefore, the blue laser light L with high directivity and excitation density does not enter the red fluorescent portion 144. On the other hand, the yellow light from the yellow fluorescent portion 146 due to the blue laser light L transmits through the reflecting portion 145 and enters the red fluorescent portion 144. The yellow light from the yellow fluorescent portion 146 has lower directivity and excitation density than the blue laser light L, so even if the red phosphor particles 1441 are excited by the yellow light, the brightness saturation phenomenon of the red phosphor particles 1441 is also Not easy to happen. That is, as compared with the case where the blue laser light L is irradiated to the red phosphor particles 1441, the red phosphor particles 1441 can effectively convert yellow light into red light. The red light emitted from the red phosphor particles 1441 transmits through the reflection part 145 and is emitted from the yellow fluorescent part 146 to the outside, mixed with the blue laser light L and the yellow light, and becomes white light. As described above, since red light is efficiently emitted, the output of white light and the color rendering properties of white light are also improved.

As a result, the occurrence of the phenomenon of brightness saturation of the red phosphor particles 1441 can be suppressed, and a reduction in conversion efficiency, output of white light, and color rendering of white light can be suppressed.

[Embodiment 3] In the second embodiment, the color conversion element 104 in which the entire red fluorescent portion 144 is formed in a uniform layer is described as an example. In the third embodiment, the color conversion element 104A in which the red fluorescent portion is divided at predetermined intervals along the substrate 141 will be described as an example. In the following description, the same parts as those in the second embodiment described above may be given the same symbols and their descriptions may be omitted.

FIG. 10 is a cross-sectional view of the schematic configuration of the color conversion element 104A of the third embodiment. Specifically, FIG. 10 corresponds to the diagram of FIG. 9. As shown in FIG. 10, the red fluorescent part 144 a included in the color conversion part 143 a of the color conversion element 104A is divided at predetermined intervals along the substrate 141. Specifically, the divided red fluorescent portions 144a are each formed in a rectangular shape when viewed in cross section in FIG. 10. In addition, the divided red fluorescent parts 144a are individually covered with the reflecting parts 145a. In addition, within a predetermined interval, a yellow fluorescent portion 146a is arranged. The yellow fluorescent portion 146a is in the interval, and is close to the substrate 141 via the bonding portion 142 and the reflective film 1411.

FIG. 11 is a cross-sectional view of the cross section including the line XI-XI of FIG. 10. As shown in FIG. 11, in a cross-sectional view seen from the normal direction of the substrate 141, a lattice-like recess 1462a is formed on the main surface of the yellow fluorescent portion 146a on the bonding portion 142 side. The concave portion 1462a is formed by performing groove processing such as cutting processing on the yellow fluorescent portion 146a having an equal thickness as a whole. In addition, the concave portion 1462a may not be lattice-shaped, and may be, for example, a stripe shape or a multi-ring shape.

After the reflecting portion 145a is provided on the inner surface of the concave portion 1462a, the red fluorescent portion 144a is formed by filling the concave portion 1462a with a binding material containing a plurality of red phosphor particles 1441. In this state, in the concave portion 1462a, since the red fluorescent portion 144a is covered by the reflecting portion 145a, even if the blue laser light L is irradiated from the yellow fluorescent portion 146a side, the reflecting portion 145a reflects the blue laser light L, The blue laser light L is blocked from entering the red fluorescent portion 144a. On the other hand, the yellow light irradiated from the side of the yellow fluorescent part 146a transmits through the reflecting part 145a, so the red fluorescent part 144a is excited by the yellow light to emit red light. The red light passes through the reflecting portion 145a, and is emitted to the outside through the yellow fluorescent portion 146a. That is, on the outside of the color conversion element 104A, red light, blue laser light L, and yellow light are mixed, and white light is emitted.

Also, as shown in FIG. 11, when viewed from the normal direction of the substrate 141, the entire red fluorescent portion 144 a is a single member, but at a predetermined position, the red fluorescent portion 144 a appears to be separated along the substrate 141 It is divided at predetermined intervals (refer to FIG. 10). In this case, the red fluorescent portion 144a is also divided at predetermined intervals along the substrate 141.

In this way, according to Embodiment 3, the red fluorescent portion 144a is divided at predetermined intervals along the substrate 141, the reflecting portion 145 individually covers each divided red fluorescent portion 144a, and the yellow fluorescent portion 146a is disposed at the interval Inside.

Accordingly, since the yellow fluorescent portion 146a is disposed within the space of the divided red fluorescent portion 144a, the red fluorescent portion 144a is not interposed between the yellow fluorescent portion 146a and the substrate 141 at this location. Generally speaking, the red fluorescent portion 144a has lower heat dissipation than the yellow fluorescent portion 146a, but if the red fluorescent portion 144a is not interposed between the yellow fluorescent portion 146a and the substrate 141, the The heat from the yellow fluorescent portion 146a is smoothly transmitted to the substrate 141. Therefore, the increase in temperature of the color conversion portion 143a can be suppressed, and as a result, a reduction in conversion efficiency, output of white light, and color rendering of white light can be further suppressed.

[Modification 6] In the third embodiment described above, the case where the red fluorescent portion 144a is arranged in the concave portion 1462a is exemplified. Here, the concave portion 1462a is formed by applying groove processing to the yellow fluorescent portion 146a having an equal thickness as a whole. However, the method of forming the concave portion may be arbitrary. In this modification 6, the case where the concave portion 1462b is formed by performing hole processing on the yellow fluorescent portion 146b will be described.

FIG. 12 is a cross-sectional view of the color conversion portion 143b of Modification 6. Specifically, FIG. 12 corresponds to FIG. 11. As shown in FIG. 12, in a cross-sectional view seen from the normal direction of the substrate 141, a plurality of concave portions 1462b arranged in a matrix are formed on the main surface of the yellow fluorescent portion 146b on the bonding portion 142 side. The concave portion 1462b is formed by performing hole processing such as masking or hole processing on the yellow fluorescent portion 146b having a uniform thickness as a whole. Masking includes masking using, for example, a metal mask or photoresist printing. Hole drilling includes sandblasting and etching.

After the reflecting portion 145b is provided on the inner surface of the concave portion 1462b, the red fluorescent portion 144b is formed by filling the binding material containing a plurality of red phosphor particles 1441 into the concave portion 1462b. In FIG. 12, the case where the plan view shape of the red fluorescent part 144b is a rectangle is exemplified, but the red fluorescent part 144b may be a polygon other than a rectangle, and may be a circle or an ellipse.

[Modifications 7, 8] In the third embodiment described above, the case where the divided red fluorescent parts 144a are each formed in a rectangular shape when viewed in cross section in FIG. 10 is exemplified. However, the shape of each cross-sectional view of the divided red fluorescent portion 144c may be arbitrary.

FIG. 13 is a cross-sectional view of a schematic configuration of a color conversion element 104C according to Modification Example 7. Specifically, FIG. 13 corresponds to the diagram of FIG. 10. As shown in FIG. 13, in the color conversion portion 143c of the color conversion element 104C, the divided red fluorescent portions 144c are each triangular in cross-sectional view. A concave portion 1462c corresponding to the red fluorescent portion 144c is formed in the yellow fluorescent portion 146c of the color conversion portion 143c.

FIG. 14 is a cross-sectional view of a schematic configuration of a color conversion element 104D according to Modification 8. Specifically, FIG. 14 corresponds to FIG. 10. As shown in FIG. 14, in the color conversion portion 143d of the color conversion element 104D, the divided red fluorescent portions 144d are each semicircular in cross-sectional view. The yellow fluorescent portion 146d of the color conversion portion 143d is formed with a concave portion 1462d corresponding to the red fluorescent portion 144d.

In such a cross-sectional view, the triangular red fluorescent portion 144c and the semi-circular red fluorescent portion 144d have fewer sides perpendicular to the substrate 141 than in the rectangular case. Therefore, the red fluorescent part 144c or the semi-circular red fluorescent part 144d which is triangular in cross-sectional view is easily covered with the reflecting parts 145c and 145d.

[Embodiment 4] In the second embodiment described above, the case where the entire yellow fluorescent portion 146 is formed into a uniform layer is exemplified. In the fourth embodiment, the case where the yellow fluorescent portion 146e has a shape corresponding to the incident angle α of the blue laser light L to the color conversion portion 143e will be exemplified. In the following description, the same parts as those in the second embodiment described above may be given the same symbols and their descriptions may be omitted.

FIG. 15 is an explanatory diagram of the configuration of main parts of the lighting device 1E according to the fourth embodiment. In FIG. 15, the color conversion element 104E is shown in a cross-sectional view. As shown in FIG. 15, the lighting device 1E of the fourth embodiment is provided with a condenser lens 9 e for condensing the blue laser light L emitted from the light guide member 3. The condenser lens 9e is arranged such that the optical axis of the condenser lens 9e and the optical axis of the blue laser light L emitted from the light guide member 3 are coaxial. The blue laser light L is collected by the condenser lens 9e, and enters the color conversion portion 143e of the color conversion element 104E at an angle of incidence α.

The color conversion portion 143e of the color conversion element 104E includes a red fluorescent portion 144e, a reflection portion 145e, and a yellow fluorescent portion 146e.

The red fluorescent portion 144e is a layer directly overlapping the bonding portion 142, and has a truncated cone-shaped through hole 1445e. The through hole 1445e is arranged coaxially with respect to the optical axis of the condenser lens 9e. The through hole 1445e is formed to taper toward the joint portion 142. In the red fluorescent portion 144e, the inner peripheral surface of the through hole 1445e is inclined at an angle corresponding to the incident angle α.

The reflection portion 145e is laminated on the red fluorescent portion 144e to become the inner peripheral surface of the through hole 1445e. The reflecting portion 145e covers the entire inner peripheral surface of the red fluorescent portion 144e.

The yellow fluorescent portion 146e is fitted into the through hole 1445e of the red fluorescent portion 144e via the reflection portion 145e. The yellow fluorescent portion 146e is arranged on the side opposite to the red fluorescent portion 144e in the reflecting portion 145e so as to cover the entire reflecting portion 145e. The yellow fluorescent portion 146e is formed in a truncated cone shape corresponding to the through hole 1445e. That is, the outer peripheral surface of the yellow fluorescent portion 146e is inclined at an angle corresponding to the incident angle α of the blue laser light L to the color conversion portion 143e. With this, the yellow fluorescent portion 146e has a shape corresponding to the incident angle α. Therefore, the yellow fluorescent portion 146e has a shape that substantially matches the blue laser light L collected by the condenser lens 9e. Here, "substantially coincident" means not only complete coincidence, but also cases where there is a few percent error and coincidence.

In this state, in the through hole 1445e, since the red fluorescent part 144e is covered by the reflecting part 145e, even if the blue laser light L is irradiated from the yellow fluorescent part 146e side, the reflecting part 145e reflects the blue laser light L , And the blue laser light L is blocked from entering the red fluorescent part 144e. On the other hand, the yellow light emitted from the yellow fluorescent portion 146e by the blue laser light L is transmitted through the reflecting portion 145e, and therefore, the red fluorescent portion 144e is excited by the yellow light to emit red light. A part of the red light passes through the reflecting portion 145e, and is emitted to the outside through the yellow fluorescent portion 146e. In addition, other parts of the red light are directly emitted to the outside from the red fluorescent portion 144e. That is, on the outside of the color conversion element 104E, red light, blue laser light L, and yellow light are mixed, and white light is emitted.

Next, a method of manufacturing the color conversion element 104E of Embodiment 4 will be described. 16 is a partial explanatory diagram of the manufacturing steps of the color conversion element 104E according to the fourth embodiment.

First, for example, by cutting or the like, a yellow fluorescent plate formed in a rectangular shape in advance is cut to form a yellow fluorescent portion 146e having a shape corresponding to the incident angle α (refer to FIG. 16(a)).

Next, a reflective portion 145e is formed on the outer peripheral surface of the yellow fluorescent portion 146e by, for example, a thin film forming method (see FIG. 16(b)).

Next, a red fluorescent part 144e is formed by, for example, a printing method so as to seal the outer peripheral surface of the reflecting part 145e. With this, the color conversion portion 143e having a plate shape as a whole is formed (refer to FIG. 16(c)).

Thereafter, the substrate 141 having the reflective film 1411 is aligned with the main surface on one side of the color conversion portion 143e (the main surface on the upper side in FIG. 16(c)). At this time, the reflective film 1411 and the color conversion portion 143e are bonded by the bonding portion 142. With this, the color conversion element 104E (see FIG. 15) is completed.

In this manner, according to the fourth embodiment, the yellow fluorescent portion 146e has a shape corresponding to the incident angle α of the blue laser light L to the color conversion portion 143e.

Accordingly, since the yellow fluorescent portion 146e has a shape corresponding to the incident angle α, the yellow fluorescent portion 146e can be limited to the irradiation range of the blue laser light L to the color conversion portion 143e. As a result, the yellow fluorescent portion 146e and the blue laser light L can be substantially matched, and the yellow fluorescent portion 146e can be reduced as much as possible. Since the price of the yellow fluorescent part 146e is higher than that of the red fluorescent part 144e, the cost can be reduced.

In addition, the incident angle α of the blue laser light L to the color conversion portion 143e may be 60 degrees or more. In this case, the side surface of the yellow fluorescent portion 146e is also inclined at an angle corresponding to the incident angle α. That is, since the side surface of the yellow fluorescent portion 146e is inclined gently, it is easy to form a film when the reflecting portion 145e is formed on the yellow fluorescent portion 146e. Thereby, since the reflecting portion 145e is easily contacted with the yellow fluorescent portion 146e, the reflection performance of the reflecting portion 145e can also be improved.

[Other embodiments] In the above, the lighting device of the present invention has been described based on the above-mentioned embodiments and various modifications, but the present invention is not limited to the above-described embodiments and each modification.

In each of the above embodiments and modifications, the case where the color conversion element 4 is applied to the lighting device 1 is described as an example, but the color conversion element 4 can also be used in other lighting systems. Examples of other lighting systems include projectors and headlights for cars. When applied to a projector, the color conversion element is used as a fluorescent wheel.

In addition, in the above-described first embodiment and the like, a case where the reflecting portion 45 is provided on the main surface of the color conversion portion 43 on the substrate 41 side is exemplified. However, a reflection portion may be provided on the main surface of the substrate on the color conversion portion side. In this case, the joining portion is interposed between the color conversion portion and the reflecting portion, and these members are joined.

In addition, a reflection suppression layer such as an AR coating may be laminated on the light emission surface that is the main surface outside the color conversion portion 43. Thereby, the light extraction efficiency can be improved.

In addition, in the above-described first embodiment and the like, the first fluorescent portion 44 obtained by solidifying a plurality of first phosphor particles 441 with the first inorganic material 442 is taken as an example. However, the first fluorescent portion may be formed of a first fluorescent body in which a plurality of first fluorescent particles are sintered and integrated as a whole. In this case, the integrated first phosphor is "a first inorganic material including at least the first phosphor".

In addition, in the above-described first embodiment and the like, the second phosphor part 46 is formed by solidifying a plurality of second phosphor particles 461 by the second inorganic material 462. However, the second phosphor portion may be formed by sintering a plurality of second phosphor particles to form an integrated second phosphor as a whole. In this case, the integrated second phosphor is "a second inorganic material including at least the second phosphor".

In addition, the above-mentioned embodiments can be obtained by applying various modifications thought by those having ordinary knowledge in the technical field to the above-mentioned embodiments, or by arbitrarily combining the constituent elements and functions of the above-mentioned embodiments without departing from the scope of the present invention, Also included in the invention.

1. 1E‧‧‧Lighting device 2‧‧‧Light Source Department 3‧‧‧Light guide 4, 4B, 4C, 4D, 4E, 104, 104A, 104C, 104D, 104E 9e‧‧‧Condenser lens 41, 141‧‧‧ substrate 42、142‧‧‧Joint 43, 43a, 43b, 43c, 43d, 43e, 143, 143a, 143b, 143c, 143d, 143e 44, 44a, 44b, 44c, 44d, 44e ‧‧‧ first fluorescent part 45, 145, 145a, 145b, 145c, 145d, 145e 46, 46a, 46b, 46c, 46d, 46e ‧‧‧ second fluorescent part 144, 144a, 144b, 144c, 144d, 144e ‧‧‧‧Red fluorescent part (second fluorescent part) 146, 146a, 146b, 146c, 146d, 146e‧‧‧‧yellow fluorescent part (first fluorescent part) 441‧‧‧First phosphor particles (first phosphor) 442‧‧‧First inorganic material 443, 443a, 443b, 443c ‧‧‧ recess 461‧‧‧Second phosphor particles (second phosphor) 462‧‧‧Second inorganic material 1411‧‧‧Reflective film 1441‧‧‧Red phosphor particles 1445e‧‧‧Through hole 1461‧‧‧ yellow phosphor particles 1462a, 1462b, 1462c, 1462d L‧‧‧ blue laser light (light with a predetermined wavelength) R1‧‧‧Irradiation range α‧‧‧incidence angle

[Fig. 1] Fig. 1 is a schematic diagram of a schematic configuration of a lighting device according to Embodiment 1. [FIG. 2] FIG. 2 is a schematic cross-sectional view of the color conversion element according to the first embodiment. [FIG. 3] FIG. 3 is a cross-sectional view of the cross section including the line III-III of FIG. 2. [FIG. 4] FIG. 4 is a cross-sectional view of a color conversion unit in Modification 1. FIG. [Fig. 5] Fig. 5 is a cross-sectional view of a schematic configuration of a color conversion element according to Modification 2. [Fig. 6] Fig. 6 is a cross-sectional view of a schematic configuration of a color conversion element according to Modification 3. [FIG. 7] FIG. 7 is a cross-sectional view of a schematic configuration of a color conversion element according to Modification 4. [FIG. 8] FIG. 8 is a cross-sectional view of a schematic configuration of a color conversion element according to Modification 5. [Fig. 9] Fig. 9 is a cross-sectional view of a schematic configuration of a color conversion element according to Embodiment 2. [Fig. 10] Fig. 10 is a cross-sectional view of a schematic configuration of a color conversion element according to a third embodiment. [FIG. 11] FIG. 11 is a cross-sectional view observing a cross section including the line XI-XI of FIG. [FIG. 12] FIG. 12 is a cross-sectional view of a color conversion unit in Modification 6; [Fig. 13] Fig. 13 is a cross-sectional view of a schematic configuration of a color conversion element according to Modification Example 7. [Fig. 14] Fig. 14 is a cross-sectional view of a schematic configuration of a color conversion element according to Modification 8. [Fig. 15] Fig. 15 is an explanatory diagram of the configuration of main parts of the lighting device according to the fourth embodiment. [FIG. 16] (a) to (c) FIG. 16 is a partial explanatory diagram of the manufacturing steps of the color conversion element according to the fourth embodiment.

4‧‧‧Color conversion element

41‧‧‧ substrate

42‧‧‧Joint

43‧‧‧ Color Conversion Department

44‧‧‧First Fluorescent Department

441‧‧‧First phosphor particles (first phosphor)

442‧‧‧First inorganic material

443‧‧‧recess

45‧‧‧Reflection Department

46‧‧‧Second Fluorescence Department

461‧‧‧Second phosphor particles (second phosphor)

462‧‧‧Second inorganic material

Claims (10)

A color conversion element, including: Substrate; and The color conversion part is arranged on the substrate; The color conversion section includes: The first fluorescent part is arranged on the main surface of the substrate; and The second fluorescent part is divided in the first fluorescent part at predetermined intervals along the substrate; The first fluorescent part is provided with a first inorganic material, the first inorganic material includes at least a first fluorescent body that converts light of a predetermined wavelength into light of other wavelengths; The second fluorescent part includes a second fluorescent body that converts light of a predetermined wavelength into light having a longer wavelength than the first fluorescent body. For example, the color conversion element of the first item of patent scope The second fluorescent part includes a second inorganic material including at least the second fluorescent body. For example, the color conversion element of the first or second patent scope, in which A concave portion is formed on the main surface of the first fluorescent portion on the substrate side, The second fluorescent part is filled in the concave part. For example, the color conversion element of the first or second patent scope, in which The second fluorescent portion has a tapered cross-sectional shape that tapers toward the opposite side of the substrate. For example, the color conversion element of the first or second patent scope, in which On the main surface of the color conversion portion on the substrate side, a reflection portion is laminated. For example, the color conversion element of the first or second patent scope, in which Compared with other ranges, in the irradiation range where the light of a predetermined wavelength irradiates the color conversion part, the installation density of the second fluorescent part is smaller. For example, if the color conversion element of the first or second patent application scope includes: The reflecting part is arranged between the first fluorescent part and the second fluorescent part, and is laminated on the first fluorescent part and the second fluorescent part, The second fluorescent part is a red fluorescent part that emits red light by irradiating yellow light, The first fluorescent part is a yellow fluorescent part that emits yellow light by irradiating blue laser light, The reflecting part reflects the blue laser light and transmits yellow light and red light. For example, the color conversion element of the seventh patent application scope The red fluorescent part is divided at predetermined intervals along the substrate, The reflecting part individually covers each of the divided red fluorescent parts, The yellow fluorescent part is arranged in the interval. For example, the color conversion element of the seventh patent application scope The yellow fluorescent part has a shape corresponding to the incident angle of the blue laser light to the color conversion part. A lighting device, including: A color conversion element as described in any of items 1 to 9 of the patent application scope; and The light source section emits light of the predetermined wavelength irradiated to the color conversion element.

Images