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White-light LED (Light Emitting Diode) light source

A technology of LED light source and LED chip, which is applied in the field of white LED light source, can solve the problems such as the decrease of light efficiency of white light LED light source, and achieve the effects of reducing light loss, avoiding reabsorption, and improving color rendering index

Active Publication Date: 2015-05-20
江西省兆驰光电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the excitation spectrum of the phosphor powder in this system almost covers the entire yellow-green light band, its reabsorption of yellow-green light will lead to a significant decrease in the luminous efficiency of the white LED light source, with a drop rate of more than 30%.

Method used

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  • White-light LED (Light Emitting Diode) light source

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Gallium Nitride blue light chips with main emission peaks at 445-450nm are selected, and the composition of the yellow-green phosphor used is Y 2.95 al 5 o 12 : Ce 0.05 , the main emission peak is 568.4nm, and the red phosphor used is Ca 0.85 Sr 0.1 AlSiN 3 :Eu 0.05 , the emission wavelength is 643nm, the mass ratio of the two phosphors is 90.3:9.7, the red phosphor and the yellow-green phosphor are respectively dispersed in the silica gel to make the red phosphor glue and the yellow-green phosphor glue, first red The phosphor powder glue is coated on the blue LED chip, and after it is dried, the yellow-green phosphor powder glue is coated on it. Its cross-sectional structure diagram is shown in figure 2 shown. The white light optical data of this light source are shown in Table 1.

[0040] Such as figure 2 As shown, the blue light emitted by the blue LED chip 1 passes through the encapsulation glue 5, part of which first excites the red light emitted by the...

Embodiment 2

[0042] Gallium Nitride blue light chips with main emission peaks at 452-457nm are selected, and the composition of the yellow-green phosphor used is Y 2.95 al 5 o 12 : Ce 0.05 , the main emission peak is 568.4nm, and the composition of the red phosphor is Ca 0.85 Sr 0.1 AlSiN 3 :Eu 0.05 , the emission wavelength is 643nm, and the mass ratio of these two phosphors is 90.3:9.7. First, evenly coat the red phosphor on the transparent layer made of polycarbonate (PC), then coat the yellow-green phosphor on the surface of the red phosphor layer, and place the transparent layer with the phosphor fixed in the bowl Above the blue LED chip inside the cup. Its cross-sectional structure diagram is shown in image 3 shown. The white light optical data of this light source are shown in Table 1.

[0043] Such as image 3 As shown, part of the blue light emitted by the blue LED chip 1 first excites the red light emitted by the red phosphor powder 2 on the transparent layer 4, and t...

Embodiment 3

[0045] Gallium Nitride blue light chips with main emission peaks at 450-455nm are selected, and the composition of the yellow-green phosphor used is Y 2.95 al 5 o 12 : Ce 0.05 , the main emission peak is 568.4nm, and the composition of the red phosphor is Ca 0.85 Sr 0.1 AlSiN 3 :Eu 0.05 , the emission wavelength is 643nm, and the total ratio of these two phosphors is 91.6:8.4. Mix red fluorescent powder and green fluorescent powder with polyethylene (PE) to make red fluorescent powder cake and yellow-green fluorescent powder cake, and then fix the two fluorescent powder cakes together according to the red on the bottom and yellow-green on the top, and put them in the bowl. Above the LED chip, the schematic diagram of its cross-sectional structure is as follows Figure 4 shown. The white light optical data of this light source are shown in Table 1.

[0046] Such as Figure 4 As shown, part of the blue light emitted by the blue LED chip 1 first excites the red phosphor...

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Abstract

The invention relates to a white-light LED (Light Emitting Diode) light source. The white-light LED light source comprises a bowl cup, a blue-light LED chip arranged at the bottom of the bowl cup, yellow-green fluorescent powder and red fluorescent powder, wherein the yellow-green fluorescent powder and red fluorescent powder are arranged above the blue-light LED chip, and the yellow-green fluorescent powder is arranged above the red fluorescent powder. The white-light LED light source selects the yellow-green fluorescent powder with high luminous efficacy and a rare earth aluminate matrix, yellow-green silicate fluorescent powder and silica-based nitride red powder which are combined and matched with the blue-light LED chip, and through the reasonable design of the spatial layout of fluorescent powder with different systems inside an LED, the secondary absorption of yellow-green light by the nitride red fluorescent powder can be effectively overcome, and the relatively high emergent light efficiency also can be obtained simultaneously when a color rendering index is obviously promoted. A light-emitting system provided by the invention can realize white light with high luminous efficacy and a high color rendering index by adjusting the proportioning of fluorescent powder with different emission spectrums so as to meet the technical requirements of general lighting.

Description

technical field [0001] The invention relates to a white LED light source. Background technique [0002] In the 1990s, Nichia Corporation of Japan successfully developed high-efficiency blue LEDs and reported 3 al 5 o 12 : Ce 3+ (YAG:Ce) yellow light-emitting fluorescence is used as a light conversion material, and white LEDs combined with GaN blue LEDs are known to surpass incandescent lamps, New non-polluting green solid-state lighting source for fluorescent lamps and HID lamps. [0003] with GaN blue LEDs and Y 3 al 5 o 12 : Ce 3+ (YAG:Ce) yellow light-emitting phosphor as a light conversion material to achieve white light has become the mainstream of white light LED, and has increasingly attracted the attention of researchers from all over the world, and has been widely used. However, there are still obvious deficiencies in this technical solution when it is used in the field of general lighting or where the requirement for color reproduction is very high. Due t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/50
Inventor 梁超何锦华符义兵
Owner 江西省兆驰光电有限公司
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