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White-light LED (Light Emitting Diode) light source

A technology of LED light source and LED chip, applied in the field of white light LED light source, can solve the problems such as the decrease of light efficiency of white light LED light source, and achieve the effect of reducing light efficiency loss, avoiding re-absorption, and improving color rendering index.

Active Publication Date: 2012-10-31
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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Examples

Experimental program
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Effect test

Embodiment 1

[0039] The gallium nitride blue light chip with the main emission peak at 445-450nm is selected, and the composition of the yellow-green phosphor used is Y 2.95 Al 5 O 12 :Ce 0.05 , its 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, and the mass ratio of these two phosphors is 90.3:9.7. Disperse red phosphor and yellow-green phosphor in silica gel respectively to make red phosphor glue and yellow-green phosphor glue. The phosphor glue is coated on the blue LED chip, and after it is dried, the yellow-green phosphor glue is coated on the top. Its cross-sectional structure diagram is as follows figure 2 shown. The white light optical data of this light source are shown in Table 1.

[0040] like figure 2 As shown in the figure, the blue light emitted by the blue LED chip 1 passes through the encapsulant 5, a part of which first excites the red light emitted by the red phosphor 2 below, and...

Embodiment 2

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

[0043] like 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 2 on the transparent layer 4 , and the o...

Embodiment 3

[0045] The gallium nitride blue light chip with the main emission peak at 450-455nm is selected, and the composition of the yellow-green phosphor used is Y 2.95 Al 5 O 12 :Ce 0.05 , its main emission peak is 568.4nm, and the red phosphor is composed of Ca 0.85 Sr 0.1 AlSiN 3 :Eu 0.05 , the emission wavelength is 643nm, and the total ratio of the two phosphors is 91.6:8.4. Red phosphor powder and green phosphor powder are mixed with polyethylene (PE) to make a red phosphor powder cake and a yellow-green phosphor powder cake, and then the two phosphor powder cakes are fixed together according to the red on the bottom and yellow-green on the top, and placed in a bowl with blue light. 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] like Figure 4 As shown, part of the blue light emitted by the blue LED chip 1 first excites the lower r...

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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 light LED light source. Background technique [0002] In the 1990s, Nichia Corporation of Japan successfully developed high-efficiency blue-light LEDs, and reported that Y 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 as white LEDs that will surpass incandescent lamps, New pollution-free green solid-state lighting source for fluorescent and HID lamps. [0003] with GaN blue LED and Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce) yellow light emitting phosphor as a light conversion material realizes the white light technical solution has become the mainstream of the current white light LED, and is increasingly concerned by researchers around the world, and has been widely used. However, there are still obvious deficiencies in this technical solution when used in the field of general lighting or where the requirements for ...

Claims

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Application Information

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Patent Type & Authority Applications(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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