KR20130044029A - Light emitting apparatus - Google Patents

Light emitting apparatus Download PDF

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Publication number
KR20130044029A
KR20130044029A KR1020110108281A KR20110108281A KR20130044029A KR 20130044029 A KR20130044029 A KR 20130044029A KR 1020110108281 A KR1020110108281 A KR 1020110108281A KR 20110108281 A KR20110108281 A KR 20110108281A KR 20130044029 A KR20130044029 A KR 20130044029A
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KR
South Korea
Prior art keywords
light
unit
emitting device
reflector
light emitting
Prior art date
Application number
KR1020110108281A
Other languages
Korean (ko)
Inventor
이기석
Original Assignee
엘지이노텍 주식회사
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Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020110108281A priority Critical patent/KR20130044029A/en
Publication of KR20130044029A publication Critical patent/KR20130044029A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/68—Details of reflectors forming part of the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/045—Optical design with spherical surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/06—Optical design with parabolic curvature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Led Device Packages (AREA)

Abstract

PURPOSE: A light emitting device is provided to maximize luminous efficiency by arranging a light converting unit in a reflection unit using a support unit. CONSTITUTION: A reflection unit(100) includes an inner curved surface. A light converting unit(200) is arranged in the reflection unit. A support unit(300) is extended from the reflection unit to the light converting unit and supports the light converting unit. A light source emits light to the light converting unit. A light guide unit(500) is extended from the light source to the light converting unit. [Reference numerals] (AA) Back; (BB) Front

Description

[0001] LIGHT EMITTING APPARATUS [0002]

Embodiments relate to a light emitting device.

BACKGROUND ART [0002] In recent years, LED devices have been spotlighted as light sources for various lighting devices. The LED element has advantages such as less heat generation, less power consumption, longer lifetime, and impact resistance than a conventional illumination light source. In addition, since mercury or a discharge gas is not used in the manufacturing process like a fluorescent lamp, there is an advantage that it does not cause environmental pollution.

If the LED device provides adequate power supply and heat dissipation means, it can maintain the lighting state without burning even if used for over 100,000 hours. The light output of all the light sources gradually decreases over time. Up to 80% of the initial light intensity is not easily perceived by humans. Based on this, the lighting life of the LED device is currently estimated to be about 40,000 to 50,000 hours.

Therefore, compared with 1,500 hours of incandescent lamps and 10,000 hours of fluorescent lamps, LED devices have a long lifetime and can be said to be light sources.

Lighting devices using light sources such as LED elements should be able to effectively generate light in a desired wavelength range. That is, such a lighting device should be able to effectively emit a variety of light, such as red light, blue light, green light or white light.

Regarding such a lighting device, it is described in Korean Patent No. 10-1039653.

Embodiments provide a light emitting device that effectively emits light of a desired wavelength band.

In one embodiment, a light emitting device includes: a reflector having an inner surface thereof; A light conversion unit disposed in the reflection unit; A support part extending from the reflecting part to the light converting part and supporting the light converting part; And a light source for emitting light to the light conversion unit.

In the light emitting device according to the embodiment, the light conversion unit may be disposed at a desired position in the reflection unit by using the support unit. That is, the light conversion unit may be disposed at a position where the support unit may maximize the optimal light efficiency in the reflection unit. For example, when the reflector has a dome shape, the light converter may be disposed at a central portion of the reflector.

In addition, the support part and the reflector may include a metal. Accordingly, heat generated from the light source can be effectively released. Therefore, the light emitting device according to the embodiment can prevent the degeneration of the light conversion unit due to heat and can have improved durability.

1 is a perspective view illustrating a light emitting device according to an embodiment.
2 is a cross-sectional view showing one end surface of the light emitting device according to the embodiment.
3 and 4 are views illustrating a process of irradiating light by the light emitting device according to the embodiment.

In the description of the embodiment, in the case where each plate, part, cover, or element is described as being formed "on" or "under" of each plate, part, cover, or element, "On" and "under" include both being formed "directly" or "indirectly" through other components. In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is a perspective view illustrating a light emitting device according to an embodiment. 2 is a cross-sectional view showing one end surface of the light emitting device according to the embodiment. 3 and 4 are views illustrating a process of irradiating light by the light emitting device according to the embodiment.

1 to 4, the light emitting device according to the embodiment includes a reflector 100, a light converter 200, a support 300, a light source 400, and a light guide 500.

The reflector 100 reflects light. In more detail, the reflector 100 reflects light to the open portion. In addition, a part of the reflecting part 100 has a shape open toward the front. That is, the reflector 100 may reflect light forward.

The inner surface 110 of the reflector 100 has a high reflectance. That is, the inner surface 110 of the reflector 100 is a reflecting surface. The inner surface 110 of the reflector 100 may be coated with a material having a high reflectance.

The inner surface 110 of the reflector 100 includes a curved surface. In more detail, the inner surface 110 of the reflector 100 may be a curved surface as a whole. The inner surface 110 of the reflector 100 may have a parabolic shape, a hemispherical shape, or a bowl shape. In particular, the reflector 100 itself may have a parabolic shape, a hemispherical shape, or a bowl shape.

The reflector 100 has a high thermal conductivity. Accordingly, heat of the light source 400 and the light converter 200 may be easily emitted through the reflector 100. A plurality of heat dissipation fins may be disposed on the outer surface 120 of the reflector 100.

The reflector 100 includes a metal. In more detail, examples of the material used as the reflector 100 include copper or aluminum. In addition, silver or the like may be coated on the inner surface 110 of the reflector 100.

The reflector 100 receives the light converter 200, the supporter 300, and the light guide part 500. That is, the light converter 200, the support part 300, and the light guide part 500 are disposed in the reflector 100.

The light converting unit 200 is disposed in the reflecting unit 100. The light conversion unit 200 is fixed to the reflection unit 100 by the support unit 300. In more detail, the light conversion unit 200 is fixed to the inner surface 110 of the reflector 100 by the support unit 300.

The light converter 200 may convert the wavelength of the light emitted from the light source 400. That is, the light conversion unit 200 is a wavelength conversion unit for converting the wavelength of the incident light. For example, the light converter 200 may convert ultraviolet light into blue light, green light, red light, or white light. In addition, the light converter 200 may convert blue light into green light, red light, or white light.

As shown in FIG. 2 to FIG. 4, the light converter 200 includes a receiver 210, a plurality of wavelength converting particles 220, and a host 230.

The accommodating part 210 accommodates the wavelength conversion particles 220 and the host 230. That is, the accommodating part 210 is a container accommodating the wavelength conversion particles 220 and the host 230.

The receiving portion 210 may have a bead shape. In more detail, the receiving portion 210 may have an empty bead shape inside. In more detail, the receiving portion 210 may have a spherical shape. In addition, the outer surface of the receiving portion 210 includes a curved surface. In more detail, the outer surface of the receiving portion 210 may be formed as a curved surface as a whole.

The receiving portion 210 is transparent. Examples of the material used as the accommodating part 210 may include glass or plastic. That is, the receiving portion 210 may be a glass capillary tube.

The wavelength conversion particles 220 are disposed in the accommodation portion 210. In more detail, the wavelength conversion particles 220 are uniformly dispersed in the host 230, the host 230 is disposed inside the receiving portion 210.

The wavelength conversion particles 220 convert the wavelength of the light emitted from the light source 400. The wavelength conversion particles 220 receive the light emitted from the light source 400 to convert the wavelength. For example, the wavelength conversion particles 220 may convert blue light emitted from the light source 400 into green light and red light. That is, some of the wavelength converting particles 220 convert the blue light into green light having a wavelength band of about 520 nm to about 560 nm, and another of the wavelength converting particles 220 converts the blue light to about 630. It can be converted into red light having a wavelength band between nm and about 660 nm.

Alternatively, the wavelength conversion particles 220 may convert ultraviolet light emitted from the light source 400 into blue light, green light, or red light. That is, some of the wavelength converting particles 220 convert the ultraviolet light into blue light having a wavelength band of about 430 nm to about 470 nm, and another of the wavelength converting particles 220 converts the ultraviolet light to about 520. It can be converted into green light having a wavelength band between nm and about 560 nm. In addition, another portion of the wavelength conversion particles 220 may convert the ultraviolet light into red light having a wavelength band between about 630 nm and about 660 nm.

That is, when the light source 400 is a blue light emitting diode that generates blue light, wavelength converting particles 220 for converting blue light into green light or red light may be used. Alternatively, when the light source 400 is a UV light emitting diode that generates ultraviolet light, wavelength converting particles 220 that convert ultraviolet light into blue light, green light, and red light may be used.

The wavelength conversion particles 220 may be a quantum dot (QD). The quantum dot may include a core nanocrystal and a shell nanocrystal surrounding the core nanocrystal. In addition, the quantum dot may include an organic ligand bound to the shell nanocrystal. In addition, the quantum dot may include an organic coating layer surrounding the shell nanocrystals.

The shell nanocrystals may be formed of two or more layers. The shell nanocrystals are formed on the surface of the core nanocrystals. The quantum dot may convert the wavelength of the light incident on the core core crystal into a long wavelength through the shell nanocrystals forming the shell layer and increase the light efficiency.

The quantum dot may include at least one of a group II compound semiconductor, a group III compound semiconductor, a group V compound semiconductor, and a group VI compound semiconductor. More specifically, the core nanocrystals may include Cdse, InGaP, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe or HgS. The shell nanocrystals may include CuZnS, CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe or HgS. The diameter of the quantum dot may be 1 nm to 10 nm.

The wavelength of the light emitted from the quantum dot can be adjusted according to the size of the quantum dot. The organic ligand may include pyridine, mercapto alcohol, thiol, phosphine, phosphine oxide, and the like. The organic ligands serve to stabilize unstable quantum dots after synthesis. After synthesis, a dangling bond is formed on the outer periphery, and the quantum dots may become unstable due to the dangling bonds. However, one end of the organic ligand is in an unbonded state, and one end of the unbound organic ligand bonds with the dangling bond, thereby stabilizing the quantum dot.

Particularly, when the quantum dot has a size smaller than the Bohr radius of an exciton formed by electrons and holes excited by light, electricity or the like, a quantum confinement effect is generated to have a staggering energy level and an energy gap The size of the image is changed. Further, the charge is confined within the quantum dots, so that it has a high luminous efficiency.

Unlike general fluorescent dyes, the quantum dots vary in fluorescence wavelength depending on the particle size. That is, as the size of the particle becomes smaller, it emits light having a shorter wavelength, and the particle size can be adjusted to produce fluorescence in a visible light region of a desired wavelength. In addition, since the extinction coefficient is 100 to 1000 times higher than that of a general dye, and the quantum yield is also high, it produces very high fluorescence.

The quantum dot can be synthesized by a chemical wet process. Here, the chemical wet method is a method of growing particles by adding a precursor material to an organic solvent, and the quantum dots can be synthesized by a chemical wet method.

The host 230 surrounds the wavelength conversion particles 220. That is, the host 230 uniformly disperses the wavelength conversion particles 220 therein. The host 230 may be made of a polymer. The host 230 is transparent. That is, the host 230 may be formed of a transparent polymer.

The host 230 is disposed inside the accommodating part 210. That is, the host 230 is filled inside the receiving portion 210 as a whole. The host 230 may be in close contact with the inner surface of the receiving portion 210.

The support part 300 is disposed in the reflecting part 100. The support part 300 extends from the reflecting part 100 to the light converting part 200. In more detail, the support part 300 extends from the inner surface 110 of the reflecting part 100 to the outer surface of the receiving part 210. The support part 300 supports the light conversion part 200. The support part 300 is connected to the reflecting part 100 and the receiving part 210. In more detail, the support part 300 is bonded or bonded to the inner surface 110 of the reflector 100. In addition, the support 300 is bonded or bonded to the outer surface of the light conversion unit 200. In more detail, one end of the support 300 is bonded or bonded to the inner surface 110 of the reflector 100, the other end is bonded or bonded to the outer surface of the receiving portion 210.

The support part 300 may have a rod shape. Examples of the material used as the support 300 may include glass, ceramic, polymer or metal. In particular, a metal having high thermal conductivity such as copper or aluminum may be used as the support part 300. Accordingly, the heat of the light conversion unit 200 may be easily emitted to the outside through the support unit 300.

The light source 400 is disposed in the reflector 100 or outside the reflector 100. The light source 400 generates light. The light source 400 is a point light source 400. The light source 400 may be a light emitting diode. In more detail, the light source 400 may be a blue light emitting diode or a UV light emitting diode.

The light source 400 emits light to the light conversion unit 200. The light source 400 emits light to the light conversion unit 200 through the light guide unit 500. Transmissive holes are formed in the reflective part 100, and the light source 400 may emit light to the light converting part 200 through the transmitting holes.

The light guide part 500 extends from the light source 400 to the light conversion part 200. The light guide part 500 may have a bar shape. The light guide part 500 is transparent. Examples of the material used for the light guide part 500 may include glass or plastic.

The light guide unit 500 guides the light incident from the light source 400 through total reflection and emits the light to the light conversion unit 200. One end of the light guide part 500 may be in close contact with the exit surface of the light source 400, and the other end of the light guide part 500 may be in close contact with the light conversion part 200.

3 and 4, the light emitted from the light source 400 is incident on the light converting unit 200 through the light guide unit 500. Light incident on the light conversion unit 200 is incident on the wavelength conversion particles 220.

The wavelength of the light incident on the wavelength conversion particles 220 is converted, and the light of the converted wavelength is emitted from the wavelength conversion particles 220 in all directions. That is, the wavelength conversion particles 220 emit light in an isotropic manner.

In this case, the light emitted backward from the wavelength conversion particles 220 is reflected by the reflector 100 and is emitted forward. That is, the reflector 100 reflects the light emitted from the light converter 200 and the light source 400 to the front.

Accordingly, the light emitting device according to the embodiment may emit light of a desired color to the front. In particular, the light emitting device according to the exemplary embodiment may adjust the color of the light emitted from the light source 400 and the size of the wavelength conversion particles 220 to emit light having a desired color in front.

In the light emitting device according to the exemplary embodiment, the light conversion unit 200 may be disposed at a desired position in the reflection unit 100 using the support unit 300. That is, the light converting unit 200 may be disposed at a position capable of maximizing optimal light efficiency in the reflecting unit 100 by the support unit 300. For example, when the reflector 100 has a dome shape, the light converter 200 may be disposed in a central portion of the reflector 100.

In particular, as the position of the light conversion unit 200 is properly adjusted, the light emitting device according to the embodiment may have a desired half angle. That is, the spread of the light emitted from the light emitting device according to the embodiment may be adjusted according to the position of the light conversion unit 200.

In addition, the support 300 and the reflector 100 may include a metal. Accordingly, heat generated from the light source 400 can be effectively released. Therefore, the light emitting device according to the embodiment can prevent the degeneration of the light conversion unit 200 due to heat and can have improved durability.

In addition, the features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (8)

A reflector whose inner surface is curved;
A light conversion unit disposed in the reflection unit;
A support part extending from the reflecting part to the light converting part and supporting the light converting part; And
And a light source for emitting light to the light conversion unit. The light emitting device of claim 1, further comprising a light guide part extending from the light source to the light conversion part. The method of claim 1, wherein the light conversion unit
A plurality of light conversion particles for converting wavelengths of light emitted from the light source;
A host surrounding the light conversion particles; And
Light-emitting device comprising a receiving portion for receiving the light conversion particles and the host. The light emitting device of claim 3, wherein the accommodating part has a bead shape inside. The light emitting device of claim 3, wherein the support part is connected to the reflecting part and the receiving part. The light emitting device of claim 1, wherein the reflector has a dome shape, a hemispherical shape, or a parabolic shape. The light emitting device of claim 1, wherein the reflector and the support include a metal. The method of claim 2, wherein the reflecting portion has a shape in which part is open,
The light guide unit guides the light emitted from the light source to the light conversion unit.
KR1020110108281A 2011-10-21 2011-10-21 Light emitting apparatus KR20130044029A (en)

Priority Applications (1)

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KR1020110108281A KR20130044029A (en) 2011-10-21 2011-10-21 Light emitting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110108281A KR20130044029A (en) 2011-10-21 2011-10-21 Light emitting apparatus

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