CN104390196A - LED lamp with double layers of fluorescent powder - Google Patents
LED lamp with double layers of fluorescent powder Download PDFInfo
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- CN104390196A CN104390196A CN201410406432.2A CN201410406432A CN104390196A CN 104390196 A CN104390196 A CN 104390196A CN 201410406432 A CN201410406432 A CN 201410406432A CN 104390196 A CN104390196 A CN 104390196A
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- led
- light
- fluorescent powder
- inner cover
- blue
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- 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
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
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- 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
- F21K9/20—Light sources comprising attachment means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Led Device Packages (AREA)
Abstract
The invention relates to an LED lamp with double layers of fluorescent powder. Blue light emitted by a blue light LED chip emitting blue light irradiates nitrides or nitric oxide fluorescent powder on an inner layer firstly, wherein the wave band of the blue light ranges from 430 nm to 467 nm; and light with the shorter wave band, like purple light with the wave band of 380 nm to 420 nm is motivated to irradiate YAG or silicate or LGA fluorescent powder again, and therefore ideal white light is obtained. According to the LED lamp, on the one hand, through motivation of the nitrides or the nitric oxide fluorescent powder on the inner layer, a light source large than an original wafer by several times, shorter in wave band and higher in penetrating capability is obtained; and on the other hand, the YAG or the silicate or the LGA fluorescent powder is motivated again, and the motivation effect of the light source is redoubled.
Description
Technical field
Relate generally to White LED light-emitting device of the present invention.More specifically, the present invention relates to and utilize double-deck fluorescent material to excite the LED obtaining desirable warm white for twice.
Background technology
Along with the development of technology, increasing white LED lamp is used to general lighting field.Compared with existing incandescent lamp, white LED lamp has the advantages such as volume is little, caloric value is low, power consumption is little, the life-span is long, reaction speed is fast, environmental protection, therefore has good development prospect.
Current usually utilize the combination of multiple monochromatic light LED chip or utilize monochromatic light LED chip to coordinate fluorescent material to produce there is the white light of different colour rendering index.Such as, the combination of red light chips, blue chip and green glow chip or surface can be utilized to be coated with the blue chip of yellow fluorescent powder (such as YAG fluorescent powder) to produce white light, but the former production cost is higher, be unfavorable for applying, and the colour rendering index of white light that the latter produces is relatively low and fluorescent material is easily aging.Facts have proved, although YAG fluorescent powder has used almost 20 years history, be used alone the light that YAG fluorescent powder excites up to now and still can not get desirable warm white (its colour rendering index is only about 70).
In addition, the LED chip that current usual usable floor area is less directly excites the fluorescent material of coating in its surface or on external shell to obtain white light, which has limited efficient lighting area and the luminous intensity of LED.
Therefore, there is the demand to New LED light-emitting device, this LED light emission device can significantly improve the colour rendering index of white light, and can increase light-emitting area and luminous intensity.
Summary of the invention
According to the present invention, a kind of LED with double-deck fluorescent material is provided, it is characterized in that comprising: LED luminescence component; Comprise the inner cover of nitride or nitric oxide fluorescent powder, it covers described LED luminescence component; And comprising the outer cover of YAG, silicate or LGA fluorescent material, it covers on outside described inner cover.
In further embodiment, described blue light emitting assembly is blue-light LED chip.
In further embodiment, described blue-light LED chip is coated with nitride or nitric oxide fluorescent powder.
In further embodiment, described chip and described inner cover are close together.
In further embodiment, described chip and described inner cover have the distance of 3mm-20mm, and fill space between the two with transparent polymer.
In further embodiment, described inner cover and described outer cover are all the housings formed after mixing by fluorescent material and transparent silica gel.
The invention has the advantages that, first the blue light of 420-467nm or 430-467nm utilizing independent LED chip or the LED chip that is coated with fluorescent material to send irradiates nitride or the nitric oxide fluorescent powder of internal layer, the purple light outer field YAG of directive, silicate or the LGA fluorescent material again of the 380-420nm inspired, thus obtain desirable white light.One aspect of the present invention excites to obtain by the nitride of internal layer or nitric oxide fluorescent powder and is greater than former wafer several times and more short-wave band and the stronger light source of penetration capacity, on the other hand again two degree excite YAG, silicate or LGA fluorescent material, its stimulation effect is doubled.
Accompanying drawing explanation
Fig. 1 schematically shows the first embodiment according to LED of the present invention.
Fig. 2 schematically shows the second embodiment according to LED of the present invention.
Fig. 3 schematically shows the 3rd embodiment according to LED of the present invention.
Detailed description of the invention
Below with reference to the accompanying drawings the preferred embodiments of the present invention are described in detail.First with reference to figure 1, it schematically illustrates the first embodiment according to LED of the present invention.This LED comprises and is arranged in one or more blue-light LED chips 2 on support 1 and two cover bodies 3 and 4.These chips can be sticked on support by transparent crystal-bonding adhesive, or are otherwise fixed on support.The arrangement of these chips can be determined according to actual needs, such as, in order to realize uniformly light-emitting, chip can be lined up one dimension or two-dimensional array form, or can arrange by donut form.Certainly, other arrangement modes are also expected.These chips can be fixed on support by horizontal mounting means routinely, also vertically can install together with support.When diode is energized, the front of the LED chip on upstanding transparent support can normal luminous, and the bottom of LED chip also can pass through transparent rack sends brighter light, can eliminate because of the restriction that the relation of current supply line outwards can not be shown one side the brightest for light emitting diode in existing encapsulation technology thus, improve the light emission rate of light emitting diode.
LED according to the present invention uses multiple fluorescent material, such as YAG fluorescent powder, silicate fluorescent powder, LGA fluorescent material and nitride or nitric oxide fluorescent powder.The primary raw material of YAG fluorescent powder is aluminium oxide and yittrium oxide and small amounts cerium, and can also add a small amount of gadolinium or potassium etc. as required.YAG fluorescent powder can by blue-light excited go out gold-tinted.The silicate fluorescent powder simultaneously used is the fluorescent material adopting silica, strontium carbonate, brium carbonate etc. to make for base starting material, and its emission wavelength is adjustable from 507nm to 610nm.Green powder (its composition be barium (Ba) 0.8 strontium (Sr) 0.2 silicon (Si) 1 oxygen (O) 3, europium (Eu) 0.02) and rouge and powder (its composition is barium (Ba) 0.05, strontium (Sr) 2.9, silicon (Si) 1, magnesium (Mg) 0.05, oxygen (O) 4, europium (Eu) 0.02) is comprised at this silicate fluorescent powder used.The advantage of silicate fluorescent powder is to have remarkable absorbability to ultraviolet, near ultraviolet, blue light, and emission spectrum coverage is wide, and have good launching effect from green to orange, spectrum also can adjust according to user's request.Similarly, LGA fluorescent material can also be used, as German Merck LGA 549200 fluorescent material.In addition, the primary raw material of nitride or nitric oxide fluorescent powder is (SrCa) A1SiN3Eu2+ and (Sr, Ba, Ca) 2Si5N8:Eu2, nitride or nitric oxide fluorescent powder can by blue-light excited go out the light of more short-wave band, such as in the present invention, the blue light of 420-467nm or 430-467nm can irradiate nitride or nitric oxide fluorescent powder, thus inspires the purple light of 380-420nm.
Particularly, in the embodiment shown in fig. 1, the inner cover 3 covered on outside blue-light LED chip 2 comprises nitride or nitric oxide fluorescent powder, and more the outer cover 4 of outside comprises YAG, silicate or LGA fluorescent material.When normally working, LED chip 2 energising sends the blue light of 420-467nm or 430-467nm wave band, on this blue light illumination to the nitride or nitric oxide fluorescent powder of inner cover.Excite after conversion through silicate fluorescent powder, this blue wave band is converted into the purple light of 380-420nm.This, more on the YAG of the further directive outer cover of light of short-wave band, silicate or LGA fluorescent material, excites the light converting another wave band to again.The exciting light of above-mentioned different-waveband and transmitted light are finally mixed to get desirable white light.
On the other hand, the inner cover 3 comprising nitride or nitric oxide fluorescent powder can be regarded as a specific illuminator together with LED chip 2 wherein.This illuminator uses the LED chip of very small size to excite the fluorescent material cover of relatively large number ten times of areas, thus acquisition efficient lighting area is greater than the light source of former wafer several times, its light sent is two degree of YAG, silicate or LGA fluorescent material covers exciting outside subsequently, and stimulation effect is doubled.
In this embodiment, inner cover 3 and outer cover 4 are all from supporting, and namely the two is independently housing, and spaced from each other, such as 0.1 ~ 3mm.In order to realize this effect, above-mentioned housing can be formed with after fluorescent material and transparent molding material mixing, such as, fluorescent material can be mixed with transparent silica gel or glass heats and molded and shaped.Between inner cover 3 and the outer cover 4 and space of inner cover 3 inside can be hollow, but preferably fills transparent polymer cooling fluid wherein, to accelerate the heat distributing LED chip generation.In addition, LED chip can be close together with inner cover 3, or LED chip can have the distance of 3mm-20mm with inner cover 3, and fills space between the two with transparent polymer.
Fig. 2 schematically illustrates the second embodiment according to LED of the present invention.With the embodiment shown in Fig. 1 unlike, this LED comprises a transparent shell 5 further, and inner cover 3 and outer cover 4 are respectively the phosphor powder layer being coated in this transparent shell inner surface and outer surface.This transparent shell 5 can by transparent material as glass or polymer be made, and its thickness is about 1 ~ 3mm, and coated fluorescent material thickness can within the scope of 0.1-1.5mm.Equally, as selection, in the cavity that can be formed at housing 5, fill transparent polymer cooling fluid, to accelerate LED chip heat radiation.
Although Fig. 1 shows the LED of circle or elliptical profile, and Fig. 2 shows the cylindrical LED on the convex top of band, and the present invention is also not intended to be confined to this, and the such as square LED of other shapes is also expected.In addition, those skilled in the art are easy to recognize that the shape embodiment of Fig. 1 being designed to Fig. 2 is more favourable, are also designed to nested test tube shape by the inner cover 3 in Fig. 1 and outer cover 4 and can contribute to producing and assembling.
Fig. 3 schematically illustrates the 3rd embodiment according to LED of the present invention.Similar with the embodiment shown in Fig. 1, this LED comprises and is arranged in multiple blue-light LED chips 2 on substrate or base plate 1 and two cover bodies 3 and 4, and these two cover bodies can be from supporting, and namely the two is independently housing, and spaced from each other.In addition, between inner cover 3 and the outer cover 4 and space of inner cover 3 inside can be hollow, but preferably fills transparent cooling fluid 5 wherein, to accelerate the heat distributing LED chip generation.Certainly, this LED also can be designed to the embodiment shown in Fig. 2 similar, namely inner cover 3 and outer cover 4 be respectively be coated in transparent shell 5 inner surface and outer surface on phosphor powder layer, and fill transparent cooling fluid in the cavity that can be formed at housing 5, to accelerate LED chip heat radiation.
With the embodiment of Fig. 1 and Fig. 2 use completely blue light to excite inner cover 3 and the fluorescent material in outer cover 4 unlike, in the embodiments of figure 3, some blue light LED chip is directly coated with nitride or nitric oxide fluorescent powder layer 6, thus before carrying out exciting conversion twice through inner cover 3 with outer cover 4, the blue light of 420-467nm or 430-467nm wave band and the purple light of 380-420nm has been there is in cover body, the exciting light of these different-wavebands and utilizing emitted light irradiate nitride or nitric oxide fluorescent powder cover 3 and YAG successively, silicate or LGA fluorescent material cover 4 carry out secondary excitation, the further colour rendering index of white light that finally obtains of raising thus.
Although specifically describe in detail the present invention with reference to the embodiment of accompanying drawing, those skilled in the art understand other embodiment can obtain identical result.Change of the present invention and amendment will be apparent for those skilled in the art, and be included in the scope of the application.
Claims (12)
1. there is a LED for double-deck fluorescent material, it is characterized in that comprising:
Send the LED luminescence component of the blue light of 430nm to 467nm wave band;
Comprise the inner cover of nitride or nitric oxide fluorescent powder, it covers described LED luminescence component, and described blue-light excited described nitride or nitric oxide fluorescent powder send the purple light of 380nm to 420nm wave band; And
Comprise the outer cover of YAG, silicate or LGA fluorescent material, it covers on outside described inner cover.
2. LED as claimed in claim 1, it is characterized in that, described LED luminescence component is blue-light LED chip.
3. LED as claimed in claim 2, it is characterized in that, described blue-light LED chip is coated with nitride or nitric oxide fluorescent powder.
4. the LED according to any one of claim 1-3, is characterized in that, described chip and described inner cover are close together or have the distance of 3mm or use transparent polymer packing space.
5. the LED according to any one of claim 1-3, is characterized in that, described chip and described inner cover are close together or have the distance of 3mm-20mm or use transparent polymer packing space.
6. LED as claimed in claim 4, is characterized in that, described inner cover and described outer cover are all the housings formed after mixing by fluorescent material and transparent silica gel.
7. there is a LED for double-deck fluorescent material, it is characterized in that comprising:
Send the LED luminescence component of the blue light of 420nm to 467nm wave band;
Comprise the inner cover of nitride or nitric oxide fluorescent powder, it covers described LED luminescence component, and described blue-light excited described nitride or nitric oxide fluorescent powder send the purple light of 380nm to 420nm wave band; And
Comprise the outer cover of YAG, silicate or LGA fluorescent material, it covers on outside described inner cover.
8. LED as claimed in claim 7, it is characterized in that, described LED luminescence component is blue-light LED chip.
9. LED as claimed in claim 7, it is characterized in that, described blue-light LED chip is coated with nitride or nitric oxide fluorescent powder.
10. LED as claimed in any one of claims 7-9, it is characterized in that, described chip and described inner cover are close together or have the distance of 3mm or use transparent polymer packing space.
11. LED as claimed in any one of claims 7-9, is characterized in that, described chip and described inner cover are close together or have the distance of 3mm-20mm or use transparent polymer packing space.
12. LED as claimed in claim 9, is characterized in that, described inner cover and described outer cover are all the housings formed after mixing by fluorescent material and transparent silica gel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410406432.2A CN104390196A (en) | 2014-08-18 | 2014-08-18 | LED lamp with double layers of fluorescent powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410406432.2A CN104390196A (en) | 2014-08-18 | 2014-08-18 | LED lamp with double layers of fluorescent powder |
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| Publication Number | Publication Date |
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| CN104390196A true CN104390196A (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410406432.2A Pending CN104390196A (en) | 2014-08-18 | 2014-08-18 | LED lamp with double layers of fluorescent powder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115490508A (en) * | 2022-10-12 | 2022-12-20 | 中国科学院上海光学精密机械研究所 | Composite fluorescent ceramic for white light LD illumination and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201340861Y (en) * | 2009-01-12 | 2009-11-04 | 上海理工大学 | Multi-layer phosphor powder white light LED |
| CN102324424A (en) * | 2011-09-22 | 2012-01-18 | 华南师范大学 | White-light LED (Light Emitting Diode) packaged by fluorescent transparent ceramic lens |
| CN202371641U (en) * | 2011-10-14 | 2012-08-08 | 郑榕彬 | Light-emitting diode (LED) lamp with double-layer fluorescent powder |
| CN204187536U (en) * | 2014-08-18 | 2015-03-04 | 郑榕彬 | There is the LED of double-deck fluorescent material |
-
2014
- 2014-08-18 CN CN201410406432.2A patent/CN104390196A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201340861Y (en) * | 2009-01-12 | 2009-11-04 | 上海理工大学 | Multi-layer phosphor powder white light LED |
| CN102324424A (en) * | 2011-09-22 | 2012-01-18 | 华南师范大学 | White-light LED (Light Emitting Diode) packaged by fluorescent transparent ceramic lens |
| CN202371641U (en) * | 2011-10-14 | 2012-08-08 | 郑榕彬 | Light-emitting diode (LED) lamp with double-layer fluorescent powder |
| CN204187536U (en) * | 2014-08-18 | 2015-03-04 | 郑榕彬 | There is the LED of double-deck fluorescent material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115490508A (en) * | 2022-10-12 | 2022-12-20 | 中国科学院上海光学精密机械研究所 | Composite fluorescent ceramic for white light LD illumination and preparation method thereof |
| CN115490508B (en) * | 2022-10-12 | 2023-11-03 | 中国科学院上海光学精密机械研究所 | Composite fluorescent ceramic for white light LD illumination and preparation method thereof |
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Application publication date: 20150304 |