JP2016058624A - Light-emitting device - Google Patents

Light-emitting device Download PDF

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Publication number
JP2016058624A
JP2016058624A JP2014185329A JP2014185329A JP2016058624A JP 2016058624 A JP2016058624 A JP 2016058624A JP 2014185329 A JP2014185329 A JP 2014185329A JP 2014185329 A JP2014185329 A JP 2014185329A JP 2016058624 A JP2016058624 A JP 2016058624A
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Japan
Prior art keywords
light
light emitting
emitting device
phosphor
ceramic
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Pending
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JP2014185329A
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Japanese (ja)
Inventor
健太 渡邉
Kenta Watanabe
健太 渡邉
淳志 元家
Atsushi Motoie
淳志 元家
俊雄 森
Toshio Mori
俊雄 森
松尾 和尋
Kazuhiro Matsuo
和尋 松尾
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パナソニックIpマネジメント株式会社
Panasonic Ip Management Corp
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Priority to JP2014185329A priority Critical patent/JP2016058624A/en
Priority claimed from DE102015113692.9A external-priority patent/DE102015113692A1/en
Publication of JP2016058624A publication Critical patent/JP2016058624A/en
Application status is Pending legal-status Critical

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Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting device capable of achieving both of satisfactory heat dissipation and optical control.SOLUTION: A light-emitting device 1 includes a laser excitation ceramic phosphor 20. The ceramic phosphor 20 includes: a light emitting part 21 constituted of a plate-like ceramic containing a laser excitation fluorescent substance; and a reflection part 22 which is formed enclosing the light emitting part 21 to reflect a beam of light 23 from the light emitting part 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light emitting device.

  Conventionally, light emitting devices using laser-excited phosphors are known (see, for example, Patent Documents 1 and 2). When irradiated with laser light, the phosphor emits light (fluorescence) when electrons are excited to return to the ground state. By emitting the fluorescence emitted from the phosphor in a desired direction, it can be used for an illumination device or the like.

  For example, Patent Document 1 discloses an illumination device that takes out fluorescence emitted from a phosphor by directing laser light on the phosphor from a light-transmitting window provided above the phosphor. Patent Document 2 discloses a laser light source device that includes a reflecting mirror for emitting fluorescence emitted from a phosphor in a predetermined direction.

JP 2012-54272 A JP 2013-12358 A

  However, the conventional light emitting device has a problem that heat dissipation cannot be sufficiently improved. Further, in the conventional light emitting device, there is a problem that optical control such as, for example, reducing fluorescence becomes difficult.

  Therefore, an object of the present invention is to provide a light emitting device that can achieve both good heat dissipation and optical control.

  In order to achieve the above object, a light-emitting device according to one embodiment of the present invention is a light-emitting device including a laser-excited ceramic phosphor, and the ceramic phosphor is formed of a plate-like ceramic and has a laser-excited fluorescence. A light-emitting part containing a body, and a reflection part provided so as to surround the light-emitting part and reflecting light from the light-emitting part.

  According to the present invention, it is possible to achieve both good heat dissipation and optical control.

1 is a schematic perspective view of a light emitting device according to an embodiment of the present invention. It is sectional drawing of the light-emitting device which concerns on embodiment of this invention. It is sectional drawing of the light-emitting device which concerns on the modification 1 of embodiment of this invention. It is sectional drawing of the light-emitting device which concerns on the modification 2 of embodiment of this invention.

  Hereinafter, a light-emitting device according to an embodiment of the present invention will be described in detail with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangements, connection forms, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected about the same structural member.

(Embodiment)
[Light emitting device]
First, a light-emitting device according to this embodiment will be described with reference to FIGS. FIG. 1 is a schematic perspective view of a light emitting device 1 according to the present embodiment. FIG. 2 is a cross-sectional view of the light emitting device 1 according to the present embodiment.

  As shown in FIGS. 1 and 2, the light emitting device 1 includes a laser light source 10, a ceramic phosphor 20, and a heat sink 30. The ceramic phosphor 20 includes a light emitting unit 21 and a reflecting unit 22.

  When the laser light source 10 irradiates the laser light 11 toward the light emitting part 21 of the ceramic phosphor 20, the light emitting part 21 emits light 23. The ceramic phosphor 20 is mounted and fixed on the mounting surface 31 of the heat sink 30.

  1 and 2, the normal direction of the mounting surface 31 of the heat sink 30 is the Z-axis direction, and the two directions parallel to and perpendicular to the normal direction are the X-axis direction and the Y-axis direction, respectively. Axial direction. That is, the placement surface 31 is parallel to the XY plane.

  Below, each structural member of the light-emitting device 1 which concerns on this Embodiment is demonstrated in detail.

[Laser light source]
The laser light source 10 is, for example, a semiconductor laser or an LED (Light Emitting Diode), and is driven by a drive current to emit laser light of a predetermined color (wavelength) toward the light emitting unit 21. Specifically, the laser light source 10 emits ultraviolet light or purple or blue visible light as the laser light 11. The laser beam 11 is excitation light of the phosphor included in the ceramic phosphor 20, and the irradiation intensity and wavelength of the laser beam 11 may be anything as long as they excite the electrons of the phosphor.

  Although one laser light source 10 is shown in FIG. 1, the light emitting device 1 may include a plurality of laser light sources 10 as shown in FIG. The plurality of laser light sources 10 are arranged so as to irradiate the light emitting unit 21 with the laser light 11 from different directions. For example, the plurality of laser light sources 10 may be arranged in a ring so as to surround the light emitting unit 21.

[Ceramic phosphor]
The ceramic phosphor 20 is a laser-excited ceramic phosphor and is formed from a plate-like ceramic. In the present embodiment, the light emitting section 21 and the reflecting section 22 are provided in the same layer as shown in FIG. That is, the ceramic phosphor 20 is a single flat plate, and the light emitting portion 21 and the reflecting portion 22 are both plate-shaped.

  As shown in FIG. 1, the planar view shape of the ceramic phosphor 20 is, for example, a rectangle. In the present embodiment, the plan view means a case when viewed from the irradiation side of the laser beam 11 (that is, when viewed from the positive direction of the Z axis). The shape of the ceramic phosphor 20 in plan view is not limited to a rectangle, and may be other shapes such as a square, a circle, or an ellipse.

In the present embodiment, the ceramic phosphor 20 is a flat plate made of a ceramic such as alumina (aluminum oxide (Al 2 O 3 )). The ceramic is not limited to alumina, and zirconia (zirconium oxide (ZrO 2 )), zinc oxide (ZnO), or the like can also be used.

  The ceramic phosphor 20 is configured by sintering ceramic particles. Specifically, the ceramic phosphor 20 is obtained by adding a binder to a mixture of a ceramic raw material such as alumina particles and a scatterer or a sintering aid (additive) and then heat-molding, followed by firing. Produced.

  At this time, the light emitting part 21 is formed by adding a phosphor to a predetermined region where the light emitting part 21 is to be formed. For example, the light emitting unit 21 is alumina containing a phosphor. The light emitting unit 21 is provided, for example, at the center of the ceramic phosphor 20. The central portion is a region including the center (or center of gravity) of the ceramic phosphor 20, for example. The shape of the light emitting unit 21 in plan view is, for example, a circular shape, but may be any shape. The planar view shape of the light emitting unit 21 may be other shapes such as a square, a rectangle, or an ellipse.

The phosphor may be any material such as a yellow phosphor, a red phosphor, a green phosphor, or a combination thereof. For example, as the phosphor, YAG-based phosphor particles, casun (CaAlSiN 3 : CASN), or the like can be used.

  In the light emission part 21, when the laser beam 11 is irradiated, the electron of a fluorescent substance is excited. Light (fluorescence) is emitted when the excited electrons return to the ground state. A part of the fluorescence is emitted as it is to the irradiation side of the laser light 11, and a part of the fluorescence is reflected by the reflecting portion 22 (boundary 24 with the light emitting portion 21) or the mounting surface 31 of the heat sink 30 to be irradiated with the laser light 11. Emitted to the side.

  In addition, the light 23 from the light emitting unit 21 may include fluorescence emitted from the phosphor and laser light 11 that is excitation light. That is, the light emitting device 1 may emit the combined light of the fluorescence and the laser light 11 as the light 23 to the outside. For example, when blue light is used as the laser light 11, the laser light 11 is scattered inside the light emitting unit 21, and a part thereof is emitted as blue light without being absorbed and converted by the phosphor. Therefore, the light emitting unit 21 can emit white light 23 by using the blue light and fluorescence (for example, yellow light) emitted from the phosphor.

  The reflection unit 22 is provided so as to surround the light emitting unit 21, and reflects the light 23 from the light emitting unit 21. In this Embodiment, the reflection part 22 is provided in the outer peripheral part of the ceramic fluorescent substance 20, and has light reflectivity. Specifically, the reflection portion 22 is a portion of the ceramic phosphor 20 that does not include the phosphor. The planar view shape of the reflecting portion 22 depends on the shapes of the ceramic phosphor 20 and the light emitting portion 21. In the present embodiment, the shape of the reflection portion 22 in plan view is an annular shape in which the outer periphery is a rectangular side and the inner periphery is an arc.

  The reflecting portion 22 has a high light reflectance and a low light absorption rate. The reflection of light by the reflection unit 22 is not limited to specular reflection but may be diffuse reflection. The light reflectance of the reflecting portion 22 is, for example, 80% or more, and preferably 90% or more. The light absorptance of the reflecting portion 22 is, for example, 20% or less, and preferably 10% or less. For example, the reflection part 22 is white alumina which does not contain a phosphor.

  The ceramic phosphor 20 is placed and fixed on the heat sink 30. For example, the ceramic phosphor 20 is fixed to the heat sink 30 by pressing the outer peripheral portion of the ceramic phosphor 20, that is, the reflecting portion 22. Any method may be used for pressing the reflecting portion 22. For example, the upper surface (the surface on the irradiation side of the laser beam 11) of the reflecting portion 22 may be pressed by a hook-shaped claw provided so as to protrude from the mounting surface 31 of the heat sink 30. Alternatively, the reflecting portion 22 may be pressed by screwing or caulking.

  Thereby, since it is not necessary to hold down the light emission part 21, the ceramic fluorescent substance 20 can be fixed, without preventing emission of the light 23 from the light emission part 21. FIG.

[heatsink]
The heat sink 30 is an example of a heat radiator on which the ceramic phosphor 20 is placed. The heat sink 30 is a heat radiating member for radiating heat generated by the light emitting portion 21 (specifically, phosphor) of the ceramic phosphor 20 to the outside (in the atmosphere). Therefore, the heat sink 30 is preferably formed using a material having high thermal conductivity such as metal. The heat sink 30 is made of, for example, aluminum die casting using an aluminum alloy. Moreover, the heat sink 30 may be provided with a plurality of heat radiating fins (not shown), for example.

  The placement surface 31 of the heat sink 30 is one of the surfaces of the heat sink 30 and is the surface on which the ceramic phosphor 20 is placed. The placement surface 31 is mirror-finished. For example, by polishing one surface of the heat sink 30, the mirror-treated mounting surface 31 is formed. Thereby, since the mounting surface 31 can reflect the light 23 from the light emission part 21, the extraction efficiency of light can be improved.

[Effects, etc.]
When using a laser-excited phosphor as in the light emitting device 1 according to the present embodiment, it is required to efficiently conduct heat generated in the phosphor to a heat sink. For example, by increasing the contact area between the phosphor and the heat sink, heat generated in the phosphor can be efficiently conducted to the heat sink.

  However, when the area of the phosphor (light emitting unit 21) is increased, the light emission area increases and optical control becomes difficult. Fluorescence (and laser light) emitted when irradiated with laser light is emitted to the outside after propagating inside the phosphor. When the area of the phosphor is increased, the propagation area is increased, and as a result, the light emission area is increased. Therefore, optical control becomes difficult, for example, the lens for condensing fluorescence becomes large. In order to facilitate optical control, the light is preferably emitted from a narrow area.

  Therefore, as described above, the light-emitting device 1 according to the present embodiment is the light-emitting device 1 including the laser-excited ceramic phosphor 20, and the ceramic phosphor 20 is made of a plate-like ceramic and is laser-excited. The light-emitting part 21 containing the phosphor of FIG. 5 and the reflection part 22 that reflects the light 23 from the light-emitting part 21 provided so as to surround the light-emitting part 21 are provided. For example, the light emitting device 1 further includes a heat sink 30 on which the ceramic phosphor 20 is placed.

  Thereby, the heat generated in the light emitting unit 21 surrounded by the reflecting unit 22 is propagated to the end of the ceramic phosphor 20 beyond the boundary 24 with the reflecting unit 22. That is, since the light emitting part 21 and the reflecting part 22 are both made of ceramic, heat is smoothly propagated at the boundary 24 between the light emitting part 21 and the reflecting part 22. Therefore, since the heat generated in the light emitting unit 21 spreads in the surface direction, it can be efficiently propagated from the entire ceramic phosphor 20 to the heat sink 30.

  On the other hand, the light 23 from the light emitting unit 21 is reflected at the boundary 24 between the light emitting unit 21 and the reflecting unit 22. Therefore, the light 23 is emitted from the light emitting unit 21 without spreading in the surface direction. Therefore, it is possible to reduce the size of the lens and improve the degree of freedom in optical design.

  As described above, according to the light emitting device 1 according to the present embodiment, it is possible to increase the contact area between the ceramic phosphor 20 and the heat sink 30 while reducing the area of the light emitting portion 21, and thus good heat dissipation. And optical control can be realized.

  For example, the light emitting unit 21 and the reflecting unit 22 are provided in the same layer.

  Thereby, the ceramic fluorescent substance 20 can be made thin and the light-emitting device 1 can be reduced in size. Further, since the light can be reflected at the boundary 24 between the light emitting unit 21 and the reflecting unit 22, the light condensing property of the light 23 can be enhanced.

  For example, the mounting surface 31 on which the ceramic phosphor 20 of the heat sink 30 is mounted is mirror-finished.

  Thereby, since the light 23 from the light emission part 21 can be reflected by the mounting surface 31, the extraction efficiency of light can be improved.

(Modification 1)
Hereinafter, Modification 1 of the light-emitting device according to this embodiment will be described with reference to FIG.

  In the light emitting device 1 according to the above-described embodiment, the light 23 is emitted toward the irradiation surface side (Z-axis positive direction) of the laser light 11, but the present invention is not limited thereto. For example, the light 23 may be emitted to the side opposite to the irradiation surface side of the laser light 11 (Z-axis negative direction), that is, to the heat sink 30 side. Alternatively, the light 23 may be emitted on both sides.

  FIG. 3 is a cross-sectional view of a light emitting device 1a according to this modification.

  As shown in FIG. 3, the light emitting device 1 a is different from the light emitting device 1 shown in FIG. 2 in that a heat sink 30 a is provided instead of the heat sink 30. Below, it demonstrates centering on a different point from embodiment.

  The heat sink 30 a is different from the heat sink 30 in that a through hole 32 is provided. The through hole 32 penetrates the heat sink 30 in the thickness direction (Z-axis direction).

  The through hole 32 is provided in a region overlapping the light emitting unit 21 in the thickness direction (Z-axis direction) of the ceramic phosphor 20. For example, the light emitting unit 21 and the through hole 32 have the same shape in plan view.

  Thereby, the light 23 from the light emitting unit 21 can be emitted to the heat sink 30 side through the through hole 32.

(Modification 2)
Next, a second modification of the light emitting device according to this embodiment will be described with reference to FIG.

  FIG. 4 is a cross-sectional view of a light emitting device 1b according to this modification.

  As shown in FIG. 4, the light emitting device 1 b is different from the light emitting device 1 shown in FIG. 2 in that a ceramic phosphor 20 b is provided instead of the ceramic phosphor 20. The ceramic phosphor 20b includes a light emitting unit 21b and a reflecting unit 22b.

  The light emitting unit 21b and the reflecting unit 22b have the same functions as the light emitting unit 21 and the reflecting unit 22 of the embodiment, but their boundaries are different. Specifically, the boundary 24b between the light emitting portion 21b and the reflecting portion 22b is inclined with respect to the thickness direction (Z-axis direction) of the ceramic phosphor 20b. The inclination angle at this time is arbitrary.

  The light 23 can be condensed by adjusting the tilt angle when the ceramic phosphor 20b is manufactured. That is, an arbitrary light distribution can be realized.

(Other)
Although the light emitting device according to the present invention has been described based on the above embodiment and its modifications, the present invention is not limited to the above embodiment.

  For example, in the above embodiment, the example in which the light emitting device 1 includes the laser light source 10 has been described. However, the light emitting device 1 may not include the laser light source 10. For example, the ceramic phosphor 20 may emit the light 23 by laser light emitted from another laser light source.

  For example, in the above embodiment, the light emitting device 1 includes the heat sink 30. However, the light emitting device 1 may not include the heat sink such as the heat sink 30. For example, the ceramic phosphor 20 may be placed on a member other than the heat radiator, or may be held by a holding member such as a clip. Even if the heat sink 30 is not provided, the heat generated in the light emitting portion 21 spreads over the entire ceramic phosphor 20, so that, for example, the contact area with air (atmosphere) is increased, and heat dissipation can be improved.

  Further, for example, in the above-described embodiment, an example in which the ceramic phosphor 20 is formed by sintering ceramic particles in which the phosphor is mixed in a predetermined region has been described, but the present invention is not limited thereto. For example, the ceramic phosphor 20 may be fabricated by ceramic thin film growth. For example, the ceramic phosphor 20 may be formed by growing ceramic directly on the mounting surface 31 of the heat sink 30. That is, the ceramic phosphor 20 and the heat sink 30 may be integrally formed.

  Further, for example, in the above-described embodiment, the example in which the ceramic phosphor 20 is a single flat plate has been described, but the present invention is not limited thereto. The ceramic phosphor 20 may include a flat plate-like reflecting portion 22 and a light emitting portion 21 provided on the main surface of the reflecting portion 22. That is, the reflection part 22 and the light emission part 21 may be laminated | stacked. Further, the ceramic phosphor 20 is not limited to a flat plate (flat, substantially rectangular parallelepiped), but may be a polyhedron in which a part of the flat plate is missing.

  Further, for example, in the above-described embodiment, the example in which the light emitting unit 21 is provided in the central portion of the ceramic phosphor 20 has been described, but the present invention is not limited thereto. For example, the light emitting unit 21 may be formed in a region not including the center of the ceramic phosphor 20. Further, the number of light emitting units 21 is not limited to one, and a plurality of light emitting units 21 may be provided in the ceramic phosphor 20.

  Further, for example, a reflective layer may be formed on the lower surface of the ceramic phosphor 20 (contact surface with the heat sink 30). Specifically, the reflective layer is provided in contact with the lower surface of the ceramic phosphor 20 and is, for example, a metal vapor deposition film such as aluminum or silver. The reflective layer is not limited to metal, and may be composed of other heat conductive materials (thermal interface material: TIM).

  Furthermore, an adhesive layer made of a heat conductive material and bonding the reflective layer and the heat sink 30 may be provided between the reflective layer and the heat sink 30 (mounting surface 31). The adhesive layer is, for example, solder or silver paste.

  The light emitting device 1 or 1a according to the above embodiment can be used for various light emitting devices such as an illumination device, a projector, and a laser pointer.

  In addition, the embodiment can be realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, or a form obtained by subjecting each embodiment to various modifications conceived by those skilled in the art. Forms are also included in the present invention.

1, 1a, 1b Light emitting device 10 Laser light source 11 Laser light 20, 20b Ceramic phosphor 21, 21b Light emitting portion 22, 22b Reflecting portion 23 Light 30, 30a Heat sink 31 Mounting surface 32 Through hole

Claims (5)

  1. A light-emitting device comprising a laser-excited ceramic phosphor,
    The ceramic phosphor is composed of a plate-shaped ceramic,
    A light-emitting part containing a laser-excited phosphor;
    A light emitting device, comprising: a reflective portion that is provided so as to surround the light emitting portion and reflects light from the light emitting portion.
  2. The light emitting device according to claim 1, wherein the light emitting unit and the reflecting unit are provided in the same layer.
  3. The light-emitting device according to claim 1, wherein the light-emitting device further includes a heat radiator on which the ceramic phosphor is placed.
  4. The light emitting device according to claim 3, wherein a surface of the heat radiating body on which the ceramic phosphor is placed is mirror-finished.
  5. 5. The light emitting device according to claim 3, wherein the heat radiating body is provided with a through-hole penetrating the heat radiating body in the thickness direction in a region overlapping the light emitting portion in the thickness direction of the ceramic phosphor.
JP2014185329A 2014-09-11 2014-09-11 Light-emitting device Pending JP2016058624A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2014185329A JP2016058624A (en) 2014-09-11 2014-09-11 Light-emitting device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2014185329A JP2016058624A (en) 2014-09-11 2014-09-11 Light-emitting device
DE102015113692.9A DE102015113692A1 (en) 2014-09-11 2015-08-19 Wavelength conversion element, light emitting device, projector, and method of manufacturing a wavelength conversion element
CN201510510691A CN105423238B (en) 2014-09-11 2015-08-19 The method of manufacturing a wavelength conversion member, the light emitting device, a projector, and a wavelength converting member
US14/832,117 US9785039B2 (en) 2014-09-11 2015-08-21 Wavelength conversion member, light emitting device, projector, and method of manufacturing wavelength conversion member

Publications (1)

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JP2016058624A true JP2016058624A (en) 2016-04-21

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Cited By (2)

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WO2018180658A1 (en) * 2017-03-29 2018-10-04 パナソニックIpマネジメント株式会社 Wavelength conversion element and light emitting device
EP3480517A1 (en) * 2017-11-03 2019-05-08 LG Electronics Inc. Phosphor module

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Publication number Priority date Publication date Assignee Title
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EP3480517A1 (en) * 2017-11-03 2019-05-08 LG Electronics Inc. Phosphor module

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