CN100409462C - Reflection white-light LED excited by fluorescent powder - Google Patents
Reflection white-light LED excited by fluorescent powder Download PDFInfo
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- CN100409462C CN100409462C CNB2005100720291A CN200510072029A CN100409462C CN 100409462 C CN100409462 C CN 100409462C CN B2005100720291 A CNB2005100720291 A CN B2005100720291A CN 200510072029 A CN200510072029 A CN 200510072029A CN 100409462 C CN100409462 C CN 100409462C
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Abstract
The present invention relates to a white light emitting diode. A reflecting mirror is arranged on the path of the emergent light of a blue light or ultraviolet light diode chip at a proper angle. By the reflection of the reflecting mirror, the emergent light is emitted from the emitting surface of the light emitting diode. Fluorescent powder is coated on the reflecting mirror or the emitting surface of the light emitting diode or the reflecting mirror and the emitting surface of the light emitting diode. The fluorescent powder is excited by blue light or ultraviolet light emitted by the chip to generate white light. The white light emitting diode has the advantages of long service life, even light color, etc. through a structure that the fluorescent powder is separated from the diode chip and the method of providing multiple excitation through reflection.
Description
Technical field
The present invention relates to is about white light emitting diode, especially relates to a kind ofly separating fluorescent material and diode chip for backlight unit and carrying out the white light emitting diode that fluorescent material excites in the reflection mode.
Background technology
Common at present and ripe white light emitting diode technology, be that light-emitting diode chip for backlight unit by blue light excites coating above it or be filled in its peripheral gold-tinted fluorescent material, be excited back gold-tinted that produces and the blue light that is used to excite of fluorescent material is complementary and produce the white light of two wavelength.Utilize white light that this mode produces wayward because participate in the ratio of the blue light of color matching and gold-tinted usually, photochromic inhomogeneous, problem such as colour temperature is higher, color rendering is on the low side is arranged.
Other has a kind of similar techniques, be to adopt ultraviolet light-emitting diode chip for backlight unit, the ultraviolet ray excited coating that makes its generation above it or be filled in the fluorescent material of its peripheral red, green, blue three looks and is made into the white light of three-wavelength by three coloured light that fluorescent material excites the back to produce.Though ultraviolet ray itself does not participate in color matching, still have suitable difficulty owing to the ratio of fluorescent material of all kinds and with ultraviolet cooperation, so the white light that this mode produces still has problems such as the photochromic uniformity.
Except the problem of the uniformity, the heat that the technology of above-mentioned white light-emitting diodes also can be produced because of light-emitting diode chip for backlight unit itself, feasible coating above it or be filled in its peripheral fluorescent material deterioration, and then cause the performance of whole light-emitting diode, comprise colourity and brightness, and all can and then reduce the life-span of light-emitting diode.
In order to solve the problem of the white light uniformity, industry has had the scheme that proposes several solutions.For example, United States Patent (USP) the 5th, 962, No. 971 and 5,813, No. 753 all is the uniformity of improving the white light mixed light that is provided with that increases filter (filter) in the encapsulation of light-emitting diode.The TaiWan, China patent the 569th in addition, No. 479 is that blue light or ultraviolet light-emitting diodes chip are arranged in the fluorescent glue, be folded in again in the comprehensive reflector plate of mediumization (dielectric omni-directional reflector), make blue light or ultraviolet light through repeatedly and multidirectional reflection and excitated fluorescent powder as far as possible, and therefore make blue light or ultraviolet light depleted of energy to improve the conversion usefulness of white light.But the heat that all also unresolved because light-emitting diode of above-mentioned these technology itself is produced, and cause the problem of the fluorescent material deterioration of direct contact.The setting of this outer filter or reflecting piece also can increase the complexity of processing procedure and cause cost to improve and yield decline.
At the problem of fluorescent material deterioration, the novel patent of TaiWan, China proposes a kind of light fixture of white light emitting diode for M246528 number, by fluorescent material is separated the thermal degradation when that is subjected to of avoiding fluorescent material with light-emitting diode chip for backlight unit.But this technology is design gives the light fixture that contains a plurality of blue light-emitting diodes, rather than at individual other light-emitting diode.
Summary of the invention
Therefore, one of main purpose of the present invention, provide a kind of white light emitting diode, utilize the way of separating be excited thing (being fluorescent material) and light source (being blue light or ultraviolet light-emitting diodes chip), make the two not directly contact, avoid being subjected to thermal degradation when and the life-span of improving white light emitting diode of the present invention of fluorescent material.
Another main purpose of the present invention, provide a kind of white light emitting diode, utilize the simple reflection framework of a kind of processing procedure, utilize reflection way, make the blue light that light-emitting diode chip for backlight unit sent or the ultraviolet light of blue light or ultraviolet light can carry out exciting of once above fluorescent material, therefore improve the effect of blue light or ultraviolet light and fluorescent material, thereby effectively improve the problem of the white light uniformity, colour temperature and color rendering.
To achieve the above object, the present invention is on the path of the emergent light of blue light or ultraviolet-ray diode chip, the speculum at one suitable angle of inclination is set, and blue light that chip is penetrated or ultraviolet light reflection are penetrated from the light outgoing plane of light-emitting diode of the present invention.Speculum, the outgoing plane of light-emitting diode, or all be coated with the fluorescent material that mates with blue light or ultraviolet-ray diode chip on the two, so at first reached the requirement that separates fluorescent material and diode chip for backlight unit, if reflecting surface and outgoing plane all are coated with the words of fluorescent material in addition, can make blue light or ultraviolet light that chip sends at first excite the fluorescent material that is coated with on the speculum and produce white light, still unspent blue light of these white lights and energy or ultraviolet light pass through the reflection of speculum again, again with outgoing plane on the fluorescent material effect that is coated with, and reach photochromic evenly, unlikely higher and the effect that color rendering is good of colour temperature.
Description of drawings
Fig. 1 a, Fig. 1 b figure is respectively side-looking and the front elevational schematic that shows according to the white light emitting diode of the first embodiment of the present invention.
Fig. 1 c is the schematic side view that shows according to the white light emitting diode of the second embodiment of the present invention.
Fig. 1 d is the schematic side view that shows according to the white light emitting diode of the third embodiment of the present invention.
Fig. 2 is the schematic side view that shows according to the white light emitting diode of the fourth embodiment of the present invention.
Among the figure
10 diode chip for backlight unit, 20 circuit boards
21,22 positive and negative electrodes, 30 epoxy resin outer covers
31 sloped top face, 32 outgoing planes
40 speculums, 50,55 fluorescent material
60 spectroscopes, 70 epoxy resin outer covers
71 end faces, 72 sides
73 outgoing planes, 81 speculums
82 speculums, 91 fluorescent material
92 fluorescent material
Embodiment
Below with reference to detailed description and claim scope, address other purpose of the present invention and advantage on the detailed description to accompanying drawing, embodiment.Need to prove that each accompanying drawing is to establish in order to explain orally essence of the present invention, should not be regarded as the definition of the scope of the invention.The definition of the relevant scope of the invention please refer to claim.
Fig. 1 a, Fig. 1 b are side-looking and the front elevational schematic that shows respectively according to the white light emitting diode of the first embodiment of the present invention.As shown in the figure, white light emitting diode proposed by the invention is blue light or the ultraviolet light-emitting diodes chip 10 with in the past, is arranged on the circuit board 20 with positive and negative electrode 21 and 22.When applying external voltage on positive and negative electrode 21 and 22 time, diode chip for backlight unit 10 can be driven and send blue light or ultraviolet light.
In transparent, the columniform bell cover that light-emitting diode in the past normally is coated on epoxy resin and is constituted, comprise chip 10 and circuit board 20 in it with protection.This bell cover also has the effect of convex lens optically focused simultaneously.Present embodiment is not the epoxy resin outer cover that adopts bell, but the similar column type outer cover 30 that obtains having a sloped top face 31 with an angle cutting circle cylinder that tilts.The angle of one angle between 15 °～75 ° arranged between sloped top face 31 and the circuit board 20
According to test, this angle
Desirable angle generally should be between 30 °～60 °.Please note that in Fig. 1 a the upper surface of the lower edge of sloped top face 31 and circuit board 20 is to be positioned at same position, but, a suitable distance can be arranged also between the upper surface of the lower edge of sloped top face 31 and circuit board 20 at other embodiment.
On the inner surface of sloped top face 31, the film forming method that the present embodiment utilization is electroplated or other is commonly used, for example sputter, chemical vapour deposition (CVD) etc., form the metallic film that one deck is constituted with one of gold (Au), aluminium (Al), nickel (Ni), titanium (Ti) and chromium materials such as (Cr), with as a speculum 40.In other embodiments, speculum 40 also can be to adopt the Bragg reflector (Braggreflector) that dielectric material constituted.Metallic film speculum or Bragg mirror all are technology that the general technology personage is understood in the technology of the present invention field.
It needs to be noted that here present embodiment is to utilize the sloped top face 31 of epoxy resin outer cover 30 that the position of implementing speculum 40 is provided.The benefit of doing like this is simple in structure.Therefore but in other embodiments, speculum 40 also can be to be arranged in addition in the epoxy resin outer cover 30, and it is cylindrical that the shape of epoxy resin outer cover 30 is not limited to also that end face splays.
Being coated with the light that is sent with chip 10 on the speculum 40 is complementary to produce the fluorescent material 50 of white light.Such as what adopt as fruit chip 10 is the light-emitting diode of blue light-emitting, and fluorescent material 50 can be the yellow fluorescent powder of yttrium-aluminium-garnet; What adopt as fruit chip 10 is the light-emitting diode of sending out ultraviolet light, and fluorescent material 50 can be the red bluish-green three-color phosphor that the barium aluminum oxide adds europium ion.Mode as for coating can adopt any suitable method of knowing, for example spin coating, sputter, printing etc.
After electrode 21 and 22 applied appropriate voltage, diode chip for backlight unit 10 can send blue light or ultraviolet light orientating reflex mirror 40 advances.Note that the incident angle and the angle of blue light or ultraviolet light orientating reflex mirror 40
Sum is 90 °.In other words, the setting of speculum 40 makes the incident angle of blue light or ultraviolet light between 15 °～75 °, and desirable angle generally should be between 30 °～60 °.These blue lights or ultraviolet light at first can excite speculum 40 lip-deep fluorescent material 50, and via producing white light behind the mixed light.Mirror 40 reflection that then can be reflected together of these white lights that generate is advanced towards outgoing plane 32.
In the present embodiment, cylindrical because epoxy resin outer cover 30 has, so outgoing plane 32 is a protruding face, have the spotlight effect of convex lens.In other embodiments, epoxy resin outer cover 30 tools have plenty of the cylindricality that cross section is a semicircle, and its outgoing plane 32 is a plane.Being the present invention does not have specific requirement to the geometry of outgoing plane 32.
Present embodiment adopts a kind of simple reflection framework that fluorescent material is separated setting with diode chip for backlight unit, has therefore avoided fluorescent material to be subjected to thermal degradation when and to reduce the problem in the life-span of diode.Based on same notion, another embodiment of the present invention is shown in Fig. 1 c.The framework of present embodiment and working method and aforementioned first embodiment are identical, and unique difference is that fluorescent material system coats within the outgoing plane 32 on the surface, and on the non-reflective mirror 40.The same with speculum 40 with first embodiment is coated with the light that is sent with chip 10 and is complementary to produce the fluorescent material 55 of white light on the surface within the outgoing plane 32.In the present embodiment, the blue light that sends of diode chip for backlight unit 10 or ultraviolet light advance towards outgoing plane 32 after speculum 40 reflections.These blue lights or ultraviolet light can excite the fluorescent material 55 on outgoing plane 32 inner surfaces, and are penetrated by outgoing plane 32 via producing white light behind the mixed light.
Though aforementioned first and second embodiment effectively realizes the setting that separates of fluorescent material and diode chip for backlight unit, the white light that is generated may also comprise blue light or the ultraviolet light that energy does not exhaust fully.Therefore, in order further to improve the photochromic uniformity, first and second embodiment can be in conjunction with the 3rd embodiment that is embodied as shown in Fig. 1 d, and promptly speculum 40 is coated with fluorescent material 50 and 55 respectively with the inner surface of outgoing plane 32.The fluorescent material 55 of outgoing plane 32 can be the same with the fluorescent material 50 of speculum 40, also can be different materials.Its emphasis makes unspent blue light of energy or ultraviolet light after acting on fluorescent material 50, is able to act on fluorescent material 55 again, improves the uniformity and the higher problem of solution colour temperature of white light.In addition, no matter the shape of outgoing plane 32 why, importantly it is the configuration of vertical (or very near vertical) with light (white light and blue light, ultraviolet light) that speculum 40 is reflected, makes unspent blue light of energy or ultraviolet light be able to fully and fluorescent material 55 acts on.
In sum, present embodiment adopts a kind of simple reflection framework, makes blue light that diode chip for backlight unit sends or ultraviolet light that the chance with the fluorescent material effect be arranged twice, makes that the white light that produces is more even, and does not have the problem of colour temperature and color rendering.Can also draw the way that other adopts two or more speculum from the present embodiment extension, these speculums can be all or partly are coated with fluorescent material, and the fluorescent material that obtains more than the secondary by the repeatedly reflection that these speculums provide excites.
From the essence of previous embodiment, can obtain the fourth embodiment of the present invention as shown in Figure 2.In this embodiment, spectroscope 60 is that angle of inclination with the speculum 40 of similar last embodiment is arranged on the emergent light path of diode chip for backlight unit 10.Act on the blue light or the ultraviolet light that diode chip for backlight unit 10 is sent of spectroscope 60 partly penetrate, partly reflect.
In the present embodiment, epoxy resin outer cover 70 can be cylindrical or cube.Its end face 71 is provided with speculum 81 and 82 respectively with side 72.The execution mode of speculum 81,82 is the same with aforesaid speculum 40.In addition, speculum 81,82 also is coated with the coloured light that is sent with chip 10 and is complementary to produce the fluorescent material 91,92 of white light.The material of fluorescent material 91,92 can be identical with coating method, also can be different.
Partly penetrate the blue light of spectroscope 60 or the speculum 81 lip-deep fluorescent material 91 that ultraviolet light at first can excite end face 71, and via producing white light behind the mixed light.Then be reflected again mirror 81 of these white lights that generate advances towards outgoing plane 73 with spectroscope 60 reflections.Similarly, blue light that is reflected by spectroscope 60 or ultraviolet light speculum 82 lip-deep fluorescent material 92 that at first can excite side 72 partly, and via producing white light behind the mixed light.These white lights that generate then be reflected again mirror 82 reflection, penetrate spectroscope 60 backs and advance towards outgoing plane 73.
With aforementioned the 3rd embodiment relatively, the blue light of the 3rd embodiment or ultraviolet light are through the exciting of twice fluorescent material, and present embodiment be with blue light or ultraviolet light be divided into two partly make its each through once with the effect of fluorescent material.The both is with the lifting white light uniformity at the scope that increases blue light or ultraviolet light and fluorescent material effect and number of times.Present embodiment even also can also be coated with fluorescent material at outgoing plane 73 in conjunction with the method for last embodiment secondary excitation is so when producing better white light.
By the detailed description of above specific embodiment, more clearly described feature of the present invention and essence, but above-mentioned concrete form of implementation is not construed as limiting to scope of the present invention.And the scope of protection of present invention also is included in the interior various changes of claim scope and the replacement of equivalent feature.
Claims (6)
1. reflection white-light LED that adopts fluorescent material to excite, it comprises at least:
Circuit board, described circuit board has positive electrode, negative electrode and light-emitting diode chip for backlight unit, and when applying appropriate voltage between described positive and negative electrode, described light-emitting diode chip for backlight unit can be driven and send specific coloured light;
First speculum, the light incidence surface of described first speculum are coated with first fluorescent material with described specific coloured light coupling, described first fluorescent material through described special color optical excitation meeting with it mixed light produce white light;
Second speculum, the light incidence surface of described second speculum are coated with second fluorescent material with described specific coloured light coupling, described second fluorescent material through described special color optical excitation meeting with it mixed light produce white light;
Spectroscope, described spectroscope is arranged at suitable angle tilt on the outgoing path of the described specific coloured light that described light-emitting diode chip for backlight unit sends, and described spectroscope causes that the described specific coloured light of injecting via described outgoing path partly penetrates described first speculum of directive, partly reflection is towards described second speculum; And
Outer cover, described outer cover is sealed in its inside with described circuit board and described speculum, penetrates to described white light emitting diode outside through the light of the described mirror reflects outgoing plane via described outer cover;
It is characterized in that: the described specific coloured light that arrives described first speculum, described first fluorescent material of described light incidence surface that excites described first speculum to be producing white light, and described white light is penetrated by described first speculum and the described spectroscope reflection back described outgoing plane by described outer cover; Arrive the described specific coloured light of described second speculum, described second fluorescent material of incidence surface of described light that excites described second speculum is to produce white light, and described white light is penetrated by the described outgoing plane of described outer cover by described second mirror reflects and after penetrating described spectroscope.
2. the reflection white-light LED that employing fluorescent material according to claim 1 excites is characterized in that: described light-emitting diode chip for backlight unit is blue LED chip or ultraviolet light-emitting diodes chip.
3. the reflection white-light LED that employing fluorescent material according to claim 1 excites is characterized in that: described first speculum is the Bragg reflector that is coated with the metallic mirror of suitable metal material or adopts suitable dielectric material.
4. the reflection white-light LED that employing fluorescent material according to claim 1 excites is characterized in that: described second speculum is the Bragg reflector that is coated with the metallic mirror of suitable metal material or adopts suitable dielectric material.
5. the reflection white-light LED that employing fluorescent material according to claim 4 excites is characterized in that: described metal material is one of following material: gold (Au), aluminium (Al), nickel (Ni), titanium (Ti) and chromium (Cr).
6. the reflection white-light LED that employing fluorescent material according to claim 1 excites, it is characterized in that: described outgoing plane is coated with the 3rd fluorescent material with described specific coloured light coupling, described the 3rd fluorescent material through described special color optical excitation meeting with it mixed light produce white light.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100720291A CN100409462C (en) | 2005-05-26 | 2005-05-26 | Reflection white-light LED excited by fluorescent powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100720291A CN100409462C (en) | 2005-05-26 | 2005-05-26 | Reflection white-light LED excited by fluorescent powder |
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| CN1870309A CN1870309A (en) | 2006-11-29 |
| CN100409462C true CN100409462C (en) | 2008-08-06 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353091B (en) * | 2008-01-29 | 2014-11-05 | 深圳市绎立锐光科技开发有限公司 | Light source structure based on light conversion efficiency increment through fluorescent powder |
| CN102305386B (en) * | 2008-01-29 | 2013-06-12 | 深圳市绎立锐光科技开发有限公司 | Light source structure and method for improving light conversion efficiency based on fluorescent powder |
| CN101498415B (en) * | 2008-01-30 | 2011-01-26 | 绎立锐光科技开发(深圳)有限公司 | Light source for improving mixing light emergent efficiency by fluorescent powder and method thereof |
| TWI363847B (en) | 2008-03-28 | 2012-05-11 | Ind Tech Res Inst | Light emitting device with positioning function and assembly method thereof |
| CN101551077B (en) * | 2008-04-03 | 2011-11-30 | 财团法人工业技术研究院 | Light-emitting device and backlight device using the same and assembling method |
| JP5770433B2 (en) * | 2010-06-18 | 2015-08-26 | ソニー株式会社 | Light source device and image projection device |
| CN102313158A (en) * | 2010-07-07 | 2012-01-11 | 陈清山 | Light emitting diode lighting bulb assembly |
| US20130329448A1 (en) * | 2011-03-01 | 2013-12-12 | Osram Gmbh | Lighting apparatus with phosphor element |
| TWI513053B (en) * | 2013-10-01 | 2015-12-11 | Prolight Opto Technology Corp | Litht emitting diode package structure |
| CN106764927A (en) * | 2016-12-17 | 2017-05-31 | 张清 | Reflection lampshade and LED street lamp |
| CN113451876B (en) * | 2018-09-10 | 2022-03-22 | 深圳市绎立锐光科技开发有限公司 | Method for manufacturing light emitting device and light emitting device |
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| JPH09232636A (en) * | 1996-02-19 | 1997-09-05 | Iwasaki Electric Co Ltd | Light emitting diode |
| JPH10242532A (en) * | 1997-02-28 | 1998-09-11 | Iwasaki Electric Co Ltd | Light emitting diode lamp and its unit |
| US20030201451A1 (en) * | 2002-04-05 | 2003-10-30 | Toyoda Gosei Co., Ltd. | Light emitting diode |
| TW569479B (en) * | 2002-12-20 | 2004-01-01 | Ind Tech Res Inst | White-light LED applying omnidirectional reflector |
| WO2004021461A2 (en) * | 2002-08-30 | 2004-03-11 | Gelcore Llc | Phosphor-coated led with improved efficiency |
| CN2646554Y (en) * | 2003-10-13 | 2004-10-06 | 璨圆光电股份有限公司 | Illuminator of white light LED lamp |
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2005
- 2005-05-26 CN CNB2005100720291A patent/CN100409462C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09232636A (en) * | 1996-02-19 | 1997-09-05 | Iwasaki Electric Co Ltd | Light emitting diode |
| JPH10242532A (en) * | 1997-02-28 | 1998-09-11 | Iwasaki Electric Co Ltd | Light emitting diode lamp and its unit |
| US20030201451A1 (en) * | 2002-04-05 | 2003-10-30 | Toyoda Gosei Co., Ltd. | Light emitting diode |
| WO2004021461A2 (en) * | 2002-08-30 | 2004-03-11 | Gelcore Llc | Phosphor-coated led with improved efficiency |
| TW569479B (en) * | 2002-12-20 | 2004-01-01 | Ind Tech Res Inst | White-light LED applying omnidirectional reflector |
| CN2646554Y (en) * | 2003-10-13 | 2004-10-06 | 璨圆光电股份有限公司 | Illuminator of white light LED lamp |
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