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A long-life and high-color-rendering white LED light source

A LED light source and high color rendering technology, applied in semiconductor devices, electrical components, circuits, etc., can solve the problems of not meeting life requirements, low light source life, poor stability, etc., and achieve the effect that the yield rate will not be affected

Active Publication Date: 2021-07-09
北京宇极芯光光电技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor stability of the layered structure of the phosphor, the life of this type of light source is low, which is far from meeting the life requirements of the current mature LED technology.

Method used

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  • A long-life and high-color-rendering white LED light source
  • A long-life and high-color-rendering white LED light source
  • A long-life and high-color-rendering white LED light source

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Such as image 3 As shown, the white light SMD LED lamp bead of this embodiment includes an LED chip 1 , two electrodes 2 and an LED bracket 3 , and the two electrodes are respectively located at both ends of the LED bracket 3 for leading out the positive and negative poles of the LED chip 1 .

[0035] First, fix the chip 1 (a chip with a peak wavelength of 440nm in this embodiment) on the LED bracket 3, and connect the two ends of the chip to the two pole pieces at the bottom of the substrate through gold wires to conduct with the two electrodes 2.

[0036] Then, according to a certain ratio, the three-color fluorescent powder containing cyan, red and yellow is formulated. This embodiment uses aluminate cyan phosphor: Sr 4 al 4 o 25 : Eu (peak wavelength 490nm), red phosphor: CaAlSi(ON) 3 : Eu (peak wavelength 650nm), yellow fluorescent powder: α-SiAlON: mixed colloid of Eu (peak wavelength 580nm), stir evenly, vacuum defoaming.

[0037] Further, the mixed colloid...

Embodiment 2

[0049] Such as image 3 As shown, the white light SMD LED lamp bead of this embodiment includes an LED chip 1 , two electrodes 2 and an LED bracket 3 , and the two electrodes are respectively located at both ends of the LED bracket 3 for leading out the positive and negative poles of the LED chip 1 .

[0050] First, fix the chip 1 (a chip with a peak wavelength of 440nm in this embodiment) on the LED bracket 3, and connect the two ends of the chip to the two pole pieces at the bottom of the substrate through gold wires to conduct with the two electrodes 2.

[0051] Then, the three-color fluorescent powder containing cyan, red and green is prepared according to a certain ratio. This embodiment uses aluminate cyan phosphor: Sr 4 al 4 o 25 : Eu (peak wavelength 490nm), red phosphor: CaAlSi(ON) 3 : Eu (peak wavelength 650nm), green phosphor: Lu 3 al 5 o 12 : Eu (peak wavelength 510nm) mixed colloid, stirred evenly, vacuum defoaming.

[0052] Further, the mixed colloid is e...

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Abstract

The invention relates to a long-life and high-color white LED light source, which consists of blue LED chips (440nm-445nm) and aluminate cyan Sr 4 al 4 o 25 : Eu (peak wavelength 480nm‑500nm) phosphor, red CaAlSi(ON) 3 : Eu (peak wavelength 630‑660nm) phosphor, green Lu 3 al 5 o 12 :Eu (peak wavelength 500nm‑520nm) or yellow α‑SiAlON:Eu (peak wavelength 570nm‑590nm) phosphor mixed to produce white light. The present invention adopts three-dimensional tetrahedral aluminate Sr 4 al 4 o 25 : Eu cyan phosphor, strong stability, instead of cyan (Ca, Sr, Ba) Si, which is structurally unstable nitrogen oxide compound 2 N 2 o 2 :Eu phosphor, completely solves the problem of short lifespan while maintaining high color rendering of all R1‑R15 greater than 90.

Description

technical field [0001] The invention relates to the field of LED technology, in particular to a 4 Al 4 o 25 : Long life, high color rendering white LED light source of Eu aluminate cyan phosphor. Background technique [0002] With the development of LED industry technology and popularization of product applications, the requirements for LED light sources are increasing day by day. In recent years, the color rendering index (Ra) of high-color white LED light source composed of blue light chip and red and green two-color phosphor powder can reach more than 95, and gradually replace the white light LED light source composed of blue light chip and yellow phosphor powder (Ra at 70 about). However, for professional lighting fields such as photographic lighting and color detection, which require high color reproduction, the color rendering of LED light sources is gradually improved. At present, the LED white light source with Ra>95 and R1-R15 greater than 90 has been realiz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/50
CPCH01L33/504
Inventor 黎力赵馥兴管晓笙张琳
Owner 北京宇极芯光光电技术有限公司
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