CN101162745A - High-efficiency fluorescent converted LED light source and backlight module - Google Patents
High-efficiency fluorescent converted LED light source and backlight module Download PDFInfo
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Abstract
A high efficient fluorescence conversion LED light source and backlight module comprise an LED arranged in a reflecting cup or the bottom of a collimating lens, and a fluorescent powder layer with predetermined thickness which is arranged on the top and is scattered with or coated with fluorescent powders and in particular comprises a first cut-off filter which is arranged between the fluorescent powder layer and the top of the reflecting cup or the collimating lens. Photons from the predetermined wavelength range of the LED penetrate the cut-off filter with an angle of incidence smaller than the predetermined value, while the backward fluorescence photons are reflected by the cut-off filter, thereby improving the fluorescence extraction efficiency. In addition, a second cut-off filter which has the opposite wave property is arranged above the fluorescent powder layer in order that the fluorescence photons can penetrate the second cut-off filter; a chamber structure consisting of two filters has multiple reflections on the incentive photons which are not absorbed by fluorescent powders to fully improve the absorption rate of the incentive photons. With the invention, the product has prominent fluorescence conversion effect and is simple in structure and technique, and convenient in realization of low cost.
Description
Technical field
The present invention relates to led light source and backlight module and realize the structure of high-efficiency fluorescence conversion.
Background technology
The conventional semiconductors light-emitting diode (Light Emitting Diode, LED) based on GaAsP and GaAlAs material, its development starts from earlier 1960s, and wavelength has covered from the green of visible light wave range and red until near infrared band.But because power output and brightness are low, the application major limitation of traditional LED is in aspects such as signal lamp, TV remote controller and low speed short distance optical-fibre communications.
Since earlier 1990s, new generation of semiconductor photoelectron material based on InGaAlP and InGaN develops rapidly, led light sources such as red, yellow, blue, green, the ultraviolet of various high power high luminances and white light emerge in large numbers one after another, emerge in an endless stream, obtained application more and more widely in various demonstrations and lighting field.
Wherein, the main technical schemes of white LED light source has RGB mixed light and fluorescence to change two kinds.The fluorescence conversion plan is to utilize the light of led chip emission shorter wavelength to excite conversion phosphor to send white light.For example, the white light LEDs patent of Japanese Ri Ya company (Nichia) discloses and has utilized 470 nano blue light led chips to excite yellow YAG fluorescent material to send the technical scheme of white light.This scenario-frame is simple, low cost of manufacture, product have very strong practicality.
The developing goal of white LED light source is to replace conventional light source such as incandescent lamp and fluorescent lamp gradually with high luminous efficiency and low-cost advantage.Up to the present, the key technical indexes of white LED light source---luminous efficiency, it is reported under tens of milliamperes of operating currents, to have surpassed 100 lumens/watt, and under hundreds of milliamperes of operating currents, reached 80 lumens/watt, all than 15 lumens/watt of incandescent lamp and 70 lumens/watt height of fluorescent lamp.But the manufacturing cost of this white LED light source is also higher relatively at present.
Along with the raising of chip light emitting efficient, fluorescent material absorption and conversion efficiency and packaging efficiency, the luminous efficiency of the white LED light source space of also improving a lot, this is for reducing white LED light source cost, energy-saving and cost-reducing all significant.
Fig. 1 has illustrated to have multiple fluorescence conversion LED light-source structure now, and (Journalof Applied Physics Japan) the 44th rolls up the 649th～651 page of the 21st phase to see Japanese Applied Physics periodical in 2005.In general, fluorescence conversion LED light source comprises LED, fluorescent material and is used for changing the reflector of photon direction that described LED places the bottom opening of reflector at least.In the scheme of Fig. 1 a, described fluorescent material 3 directly is coated on the led chip 1, colloid 4 covers fluorescent material 3 and fills the remaining space of reflector 2, thereby fluorescent material 3 sends the photon of specific wavelength and collects directed the ejaculation through reflector 2 under the photon excitation that led chip 1 is launched.For avoiding the adverse effect that light-emitting phosphor efficient and life-span are produced by the led chip heating in this scheme, the scheme of Fig. 1 b changes fluorescent material 3 into and is dispersed evenly in the colloid 4, can both improve fluorescence conversion efficiency, prolong the fluorescent material life-span, improve the uniformity of light source output again.In order further to improve fluorescence conversion efficiency, the scheme of Fig. 1 c has been done improvement again to light-source structure: over against the opening part of led chip 1 phosphor powder layer is set at reflector 2, fill to have the colloid of refraction coefficient coupling in space between this phosphor powder layer and the led chip, change the wall of cup of described reflector into diffusing characteristic diffuser by properties of specular reflection again in the scheme of Fig. 1 d, fluorescence conversion efficiency is increased again.
In addition, (Proceedings of SPIE 5491 in SPIE (the International Society for Optical Engineering) journal of SPIE about the international conference of the 5th solid-state illumination, the 45-50 page or leaf), the fluorescence conversion of white light led light source structure that a kind of performance is improved has also been proposed, as shown in Figure 2: compare with Fig. 1 d, this scheme adopts transmission cup 2 ' to replace reflector 2, also at the surperficial plating total reflection film 5 ' of the substrate of supporting led chip 1 and transmission cup 2 '; The extraction of fluorescent photon (Extracting) efficient and whole fluorescence conversion efficiency are further enhanced again dorsad.
Even like this, the weak point of existing fluorescence conversion LED light source is that the absorption efficiency of excited target photon and fluorescence extraction (Extracting) fluorescence conversion efficiency that efficient influenced still have the space that further is enhanced.Especially it is comparatively complicated on scheme technology shown in Figure 2 realizes.In addition, for monochromatic fluorescence conversion LED light source, not only need higher fluorescence conversion efficiency, also need to export pure fluorescence for some is used, this also is the deficiency that prior art exists.
Summary of the invention
The technical problem to be solved in the present invention is at above-mentioned the deficiencies in the prior art, and proposes a kind of fluorescence conversion LED light source and backlight module, and structure and technology are simple, can high efficiency also realize the fluorescence conversion at low cost.
For solving the problems of the technologies described above, of the present inventionly be contemplated that substantially, use an optical cutoff filter plate between LED and fluorescent material, utilize of the penetrate requirement of this optical cutoff filter plate to incident photon wavelength and angle, both improved utilance to the LED ballistic phonon with reflector, also adopting multicolor phosphor with when obtaining pure white light output, utilize this optical cutoff filter plate to the good reflection performance of fluorescence dorsad, thereby can improve the fluorescence extraction efficiency greatly, make whole fluorescence conversion efficiency be improved, the structure of product and technology are oversimplified simultaneously.Particularly two optical cutoff filter plates constitute special cavity configuration when utilizing up and down, and when phosphor powder layer is placed in one, can retrain the excitation photon that is not absorbed with this cavity configuration by fluorescent material, making it to come in the chamber has more probability to be absorbed by fluorescent material in the way of advancing of back reflective, thereby further improves the absorptivity of fluorescent material to excitation photons; Also be convenient to when adopting single-component phosphor, obtain pure monochromatic light output.
As the technical scheme that realizes the present invention's design be, a kind of high-efficiency fluorescence conversion LED light source is provided, comprise at least one LED, be arranged on the bottom of a reflector or collimating lens; Be provided with the phosphor powder layer of a predetermined thickness at the top of this reflector or collimating lens, uniformly dispersing or applying fluorescent material; Especially, also comprise first by filter plate, between described phosphor powder layer and described reflector or collimating lens top, thereby the light of predetermined wavelength range penetrates this by filter plate with the incidence angle less than predetermined value in this reflector or the collimating lens; When described fluorescent material is the down-conversion fluorescent powder, this first by filter plate be that short-pass is ended filter plate; Otherwise, for long-pass is ended filter plate.
Like this, can improve the absorption efficiency and the fluorescence extraction efficiency of excitation photons with simple technology and structure.
In the such scheme, described high-efficiency fluorescence conversion LED light source also comprise with described first by the logical characteristic of filter plate ripple opposite second by filter plate, be arranged on described phosphor powder layer above, thereby the photon that described fluorescent material excites penetrates this second by filter plate with the incidence angle less than second predetermined value.
In the such scheme, described first by filter plate and second roughly consistent by the logical breakover point of the ripple of filter plate, thereby the photon of the described predetermined wavelength range that is not absorbed by fluorescent material in the described phosphor powder layer is ended the described phosphor powder layer of filter plate reflected back by described second.
Like this, the further absorption efficiency of excitation photons and fluorescence extraction efficiency, and be convenient to produce pure light output.
As the technical scheme that realizes the present invention's design still, a kind of backlight module of high-efficiency fluorescence conversion is provided, comprise end box, the cooling base of this box bottom end, and be distributed in reflector or the collimating lens that some LED on the described cooling base and some bottoms surround a LED; The open top of box of the described end is sealed by the phosphor powder layer of a predetermined thickness, and this phosphor powder layer scatters or applying fluorescent material; Also comprise and be positioned at the light diffusing sheet on the described phosphor powder layer and be positioned at LCDs on this light diffusing sheet; Especially, also comprise first by filter plate, between each described reflector or collimating lens top and described phosphor powder layer, thereby the light of predetermined wavelength range penetrates this by filter plate with the incidence angle less than predetermined value in the box of the described end; When described fluorescent material is the down-conversion fluorescent powder, this first by filter plate be that short-pass is ended filter plate; Otherwise, for long-pass is ended filter plate.
In the such scheme, the backlight module of described high-efficiency fluorescence conversion also comprise with described first by the logical characteristic of filter plate ripple opposite second by filter plate, between described phosphor powder layer and described light diffusing sheet, thereby the light of the described predetermined wavelength range that is not absorbed by fluorescent material in the described phosphor powder layer is reflected back toward described phosphor powder layer, and the photon that described fluorescent material excites penetrates this second by filter plate with the incidence angle less than second predetermined value.
In the such scheme, the fluorescent material of described different materials is pressed the piece distribution or is applied in phosphor powder layer, cover on the top of a reflector or collimating lens respectively.
Adopt above-mentioned each technical scheme, the efficient of fluorescence conversion is largely increased, the pure light output that under specific occasions, can also obtain to expect, and product structure and technology keep simple advantage simultaneously, are convenient to low-cost the realization.
Description of drawings
Fig. 1 a, b, c, d are existing led light source structural representations
Fig. 2 is the structural representation of existing led light source
Fig. 3 is existing backlight modular structure schematic diagram
Fig. 4 is a led light source structural representation of the present invention
Fig. 5 is by filter plate characteristic schematic diagram among Fig. 4
Fig. 6 is one of a white LED light source embodiment of the present invention schematic diagram
Fig. 7 is two schematic diagrames of white LED light source embodiment of the present invention
Fig. 8 is three schematic diagrames of white LED light source embodiment of the present invention
Fig. 9 is a backlight modular structure schematic diagram of the present invention
Figure 10 is one of a backlight module embodiment of the present invention schematic diagram
Figure 11 is two schematic diagrames of backlight module embodiment of the present invention
Embodiment
Below, the most preferred embodiment shown in is further set forth the present invention in conjunction with the accompanying drawings.
As shown in Figure 4, the structure of led light source of the present invention comprises LED 14, be surface-pasted light-emitting diode (comprising single light-emitting diode or array formula light-emitting diode), perhaps luminescence chip (comprising single or the array luminescence chip) on substrate 15, forming.This LED 14 is arranged on the bottom of reflector 13; Described reflector 13 can adopt any known technology to realize, such as the reflector that has direct reflection or diffuse reflection wall of cup among Fig. 1, also can substitute with any known technology, such as the transmission cup 2 ' among Fig. 2, the collimating lens that perhaps has the light aggregation feature equally is (in order to narrate conveniently, the following reflector of mentioning if be not illustrated in addition, also can refer to collimating lens).
The phosphor powder layer 11 of one predetermined thickness is set, uniformly dispersing or applying fluorescent material at the top of described reflector 13.First is arranged between described phosphor powder layer 11 and described reflector 13 tops by filter plate 12, should have characteristic as Fig. 5 curve a or b by filter plate 12; With described fluorescent material is that green down-conversion fluorescent transition material (green wavelength that excites is greater than the blue light wavelength of LED emission) is an example, this first by filter plate 12 when the characteristic that have as curve a, for short-pass is ended filter plate, allowing wavelength is that the following blue light of 500nm will penetrate this by filter plate with the incidence angle less than predetermined value (being determined by this optical characteristics by filter plate), LED 14 emission than the optically focused effect of the blue light of polarizers of big angle scope like this through reflector 13, major part will incide described first with smaller angle (for example 15-25 degree) and end filter plate 12 and penetrate it, encourage described fluorescent material to launch green fluorescence (wavelength 505～550nm), this green fluorescence is because of the breakover point wavelength (500nm) of wavelength greater than curve a, part directive described first is by the output that will be reflected of the photon of filter plate 12, thereby improves the green fluorescence extraction efficiency in this light source.When described fluorescent material is green up-conversion fluorescence transition material, the described first opposite ripple that should have as curve b by filter plate 12 leads to characteristic, for long-pass by filter plate, the light of LED 14 emissions has only wavelength greater than for penetrating this filter plate 12 with the incidence angle less than predetermined value more than the 500nm.
In order further to improve fluorescence conversion efficiency, led light source of the present invention can also comprise second by filter plate 10, have with described first by the logical characteristic of the opposite ripple of filter plate 12, be arranged on described phosphor powder layer 11 above, has characteristic curve a with first by filter plate 12, second by filter plate 10 to have characteristic curve b be example, the two has roughly consistent breakover point, thereby do not absorbed fully in this phosphor powder layer 11 by fluorescent material, blue light less than the 500nm wavelength is reflected by filter plate 10 by second, and absorbed by described green fluorescence transition material and excite green glow, to penetrate this second by filter plate 10 and satisfy that the second predetermined incidence angle (by described second by the decision of filter plate 10 optical characteristics) requires or after reflection repeatedly, just satisfy green glow that this incidence angle requires, green light output will be provided.Among this embodiment, when fluorescence conversion efficiency is improved, can export pure monochromatic green glow.
If between filter plate 12 and described reflector 13 tops, stay an air-gap described first, can also make the bigger blue light of angle that is not absorbed and used in the described phosphor powder layer by filter plate 12 total reflection be taken place at the air interface place by first, return once more in the described green fluorescence transition material, help to improve the fluorescence transfer ratio.
Through experimental verification, adopt the led light source of structure of the present invention increasing by first behind filter plate 12, it is about 115% that fluorescence conversion efficiency on average can improve, and increases by second behind filter plate 10, and fluorescence conversion efficiency on average can improve about 160%.
Fluorescent material described in the present invention comprise in the monochromatic fluorescence transition material of red, yellow, green, blue a kind of, two kinds, more than three kinds or three kinds; Therefore, produce in the foregoing description the green glow, the present invention can also come the low-cost white light that produces by the coupling combination by filter plate, fluorescent material and LED.
Fig. 6 is for realizing one of white light embodiment, and described fluorescent material comprises transition material under each a kind of monochromatic fluorescence of red, green, blue, evenly mixes in phosphor powder layer 21; Described LED 24 emission ultraviolet light (wavelength 250～420nm), after reflector 23 converges, penetrate the UV short-pass by filter plate (optical characteristics with similar Fig. 5 curve a, allow the short ultraviolet light of wavelength to penetrate), thereby described three kinds of fluorescent material excite the generation red, green, blue respectively, penetrate the RGB long-pass and be mixed into white light output by filter plate 20 (optical characteristics with similar Fig. 5 curve b allows the long red, green, blue of wavelength to penetrate).In this embodiment, described first and second is opposite by the logical characteristic of ripple of filter plate, but breakover point and inconsistent.
Fig. 7 is for realizing two of white light embodiment.In this embodiment, described fluorescent material comprises transition material under red, green each a kind of monochromatic fluorescence, evenly mixes in phosphor powder layer 31; Described LED 34 emission blue light (wavelength 420～480nm), after reflector 33 converges, penetrate the blue light short-pass by filter plate (optical characteristics with similar Fig. 5 curve a, allow the short blue light of wavelength to penetrate), thereby described two kinds of fluorescent material excite respectively and produce red, green glow, are mixed together into white light output with unabsorbed part blue light.
Fig. 8 is for realizing three of white light embodiment.In this embodiment, described fluorescent material is transition material under a kind of yellow fluorescence, evenly distributes in phosphor powder layer 41; Described LED 44 emission blue light (wavelength 420～480nm), after reflector 43 converges, penetrate the blue light short-pass by filter plate (optical characteristics with similar Fig. 5 curve a, allow the short blue light of wavelength to penetrate), thereby described fluorescent material excites the generation gold-tinted, is mixed together into white light output with unabsorbed part blue light.
The present invention can also be used to designing the module backlight with high fluorescence conversion efficiency.As shown in Figure 3, existing module backlight comprises end box 60, the cooling base 62 of this box bottom, end, and be distributed in some LED 61 on the described cooling base, the open top of box of the described end 60 is sealed by the phosphor powder layer 63 of a predetermined thickness, and this phosphor powder layer 63 scatters or applying fluorescent material; Also comprise the light diffusing sheet 64 that is positioned on this phosphor powder layer and be positioned at LCDs 65 on this light diffusing sheet 64.This module backlight has the not high shortcoming of fluorescence conversion equally.As shown in Figure 9, the present invention's module backlight is in above-mentioned prior art--end box 55, cooling base 58, LED 57, phosphor powder layer 53, on the basis of light diffusing sheet 52 and LCD 50, increase reflector or collimating lens 56 that some bottoms surround a LED, and between each described reflector or collimating lens 56 tops and described phosphor powder layer 53 first by filter plate 54, make the light of predetermined wavelength range in the box of the described end 55 penetrate this by filter plate 54 with incidence angle less than predetermined value, and reflect excitation photon in the described phosphor powder layer 53, can improve the fluorescence utilance, thereby strengthen the display brightness of LCD.Equally, increase with described first again and lead to the second opposite edge filter 51 of characteristic by filter plate 54 ripples, between described phosphor powder layer 53 and described light diffusing sheet 52, cavity configuration by two filters compositions, the light from LED that is not absorbed by fluorescent material is repeatedly reflected, encourage described fluorescent material repeatedly, can improve the absorption rate of fluorescent material greatly the LED photon.And stay an air-gap by between filter plate 54 and described reflector or collimating lens 56 tops described first, light with the described predetermined wavelength range that do not absorbed by fluorescent material in the described phosphor powder layer of total reflection, the measure of raising fluorescence conversion efficiency like that, because of all in above-mentioned led light source, relating to, repeat no more.
In the backlight module of the present invention, described fluorescent material also can comprise in the monochromatic fluorescence transition material of red, yellow, green, blue a kind of, two kinds, more than three kinds or three kinds; The emission wavelength of described LED (comprise surface-pasted light-emitting diode, or the luminescence chip that forms on substrate) can be selected 250～480nm.Except selecting for use the fluorescent material that comprises transition material under each a kind of monochromatic fluorescence of red, green, blue evenly to mix among Fig. 9, the LED 57 that reaches the emission blue light produces outside the white light output by filter plate 54 with the blue light short-pass, and Figure 10 has provided to use and comprised that the fluorescent material of transition material under each a kind of monochromatic fluorescence of red, green, blue produces the another specific embodiment of white light.In this embodiment, described three kinds of fluorescent material are pressed the piece distribution or are applied in phosphor powder layer, cover on the top of a reflector or collimating lens respectively.First ends filter plate by filter plate and second can end filter plate by filter plate and RGB long-pass with the UV short-pass of full wafer, also can be as described in this figure, the UV short-pass that adopts burst by filter plate and corresponding red, green, blue long-pass by filter plate.Figure 11 has provided with comprising that the fluorescent material of transition material under red, green each a kind of monochromatic fluorescence produces the another embodiment of white light, in this embodiment, saved second by filter plate, thereby red, green glow that fluorescent material excites excite blue light to become white light output with unabsorbed LED, simplify the structure, cost is lower.
In led light source of the present invention or the backlight module, fluorescent material in the described phosphor powder layer comprises down-conversion fluorescent powder and up-conversion phosphor, it can be inorganic or organic powdery fluorescent grain by chemical synthesis, these particles can use colloid (for example transparent resin) to mix, thereby the form with pad pasting provides, or ends the filter plate or second one side by filter plate with the mode that applies attached to described first.
Adopt the led light source of structure of the present invention or backlight module can reduce sorting requirement to the LED wavelength greatly, even in use the LED wavelength is degenerated to some extent, also big physical efficiency keeps Wavelength matched between this LED and the fluorescent material, thereby reduces the cost of product.
Claims (13)
1. a high-efficiency fluorescence conversion LED light source comprises at least one LED, is arranged on the bottom of a reflector or collimating lens; Be provided with the phosphor powder layer of a predetermined thickness at the top of this reflector or collimating lens, uniformly dispersing or applying fluorescent material; It is characterized in that:
Also comprise first by filter plate, between described phosphor powder layer and described reflector or collimating lens top, thereby the light of predetermined wavelength range penetrates this by filter plate with the incidence angle less than predetermined value in this reflector or the collimating lens; When described fluorescent material is the down-conversion fluorescent powder, this first by filter plate be that short-pass is ended filter plate; Otherwise, for long-pass is ended filter plate.
2. according to the described high-efficiency fluorescence conversion LED light source of claim 1, it is characterized in that: also comprise with described first by the logical characteristic of filter plate ripple opposite second by filter plate, be arranged on described phosphor powder layer above, thereby the photon that described fluorescent material excites penetrates this second by filter plate with the incidence angle less than second predetermined value.
3. according to the described high-efficiency fluorescence conversion LED light source of claim 2, it is characterized in that:
Described first by filter plate and second roughly consistent by the logical breakover point of the ripple of filter plate, thereby the photon of the described predetermined wavelength range that is not absorbed by fluorescent material in the described phosphor powder layer is ended the described phosphor powder layer of filter plate reflected back by described second.
4. according to claim 2 or 3 described high-efficiency fluorescence conversion LED light source, it is characterized in that:
Described first by being an air-gap between filter plate and described reflector or the collimating lens top, thereby the photon of the described predetermined wavelength range that is not absorbed by fluorescent material in the described phosphor powder layer first is ended filter plate and returns described phosphor powder layer in the total reflection of air interface place by this.
5. according to claim 2 or 3 described high-efficiency fluorescence conversion LED light source, it is characterized in that:
Described phosphor powder layer is the mixture that fluorescent material and transparent refractive index match resin or liquid are formed with predetermined ratio, and fluorescent material is graininess and intersperses among wherein.
6. according to the described high-efficiency fluorescence conversion LED light source of claim 1, it is characterized in that:
Described LED is surface-pasted single light-emitting diode or array formula light-emitting diode, perhaps single luminescence chip or the array formula luminescence chip for forming on substrate.
7. according to the described high-efficiency fluorescence conversion LED light source of claim 1, it is characterized in that:
Described fluorescent material comprise in the monochromatic fluorescence transition materials such as red, yellow, green, blue a kind of, two kinds, more than three kinds or three kinds.
8. the backlight module of high-efficiency fluorescence conversion comprises end box, the cooling base of this box bottom, end, and be distributed in reflector or the collimating lens that some LED on the described cooling base and some bottoms surround a LED; The open top of box of the described end is sealed by the phosphor powder layer of a predetermined thickness, and this phosphor powder layer scatters or applying fluorescent material; Also comprise and be positioned at the light diffusing sheet on the described phosphor powder layer and be positioned at LCDs on this light diffusing sheet; It is characterized in that:
Also comprise first by filter plate, between each described reflector or collimating lens top and described phosphor powder layer, thereby the light of predetermined wavelength range penetrates this by filter plate with the incidence angle less than predetermined value in the box of the described end;
When described fluorescent material adopt be the down-conversion fluorescent powder time, this first is that short-pass is ended filter plate by filter plate; Otherwise, for long-pass is ended filter plate.
9. the backlight module of described according to Claim 8 high-efficiency fluorescence conversion is characterized in that:
Also comprise with described first by the logical characteristic of filter plate ripple opposite second by filter plate, between described phosphor powder layer and described light diffusing sheet, thereby the light of the described predetermined wavelength range that is not absorbed by fluorescent material in the described phosphor powder layer is reflected back toward described phosphor powder layer, and the light that described fluorescent material excites penetrates this second by filter plate with the incidence angle less than second predetermined value.
10. it is characterized in that according to Claim 8 or the backlight module of 9 described high-efficiency fluorescences conversion:
Described first by being an air-gap between filter plate and described reflector or the collimating lens top, thereby the light of the described predetermined wavelength range that is not absorbed by fluorescent material in the described phosphor powder layer is returned described phosphor powder layer by total reflection.
11. the backlight module of described according to Claim 8 high-efficiency fluorescence conversion is characterized in that:
Described LED is surface-pasted light-emitting diode, perhaps the luminescence chip for forming on substrate.
12. according to Claim 8 or the backlight module of 9 described high-efficiency fluorescences conversion, it is characterized in that:
Described fluorescent material comprise in the monochromatic fluorescence transition material of red, green, blue a kind of, two or three; The emission wavelength of described LED is 250～480nm.
13. the backlight module according to the described high-efficiency fluorescence conversion of claim 12 is characterized in that:
The fluorescent material of described different materials is pressed the piece distribution or is applied in phosphor powder layer, cover on the top of a reflector or collimating lens respectively.
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