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LED chip capable of generating amber light

A LED chip and colored light technology, applied in electrical components, circuits, semiconductor devices, etc., can solve the problems of low luminous efficiency, low chemical stability, and high cost, and achieve strong chemical stability, high amber light conversion efficiency, and high saturation degree of effect

Inactive Publication Date: 2016-11-16
麦科勒(滁州)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an LED chip that produces amber light to solve the problems of low chemical stability, low luminous efficiency and high cost of the existing LED chip that produces amber light in a high temperature and high humidity environment

Method used

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  • LED chip capable of generating amber light
  • LED chip capable of generating amber light
  • LED chip capable of generating amber light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The LED chip that produces amber light has a structure that the blue LED chip is covered with a phosphor coating, and silica gel is added to the phosphor coating. The phosphor is composed of two phosphors, one is cerium-doped yttrium aluminum garnet red phosphor Y 3 Al 5 o 12 : Ce 3+ , the other is erbium-doped nitride yellow phosphor CaAlSiN 3 :Eu 2+ , the two kinds of phosphors are mixed together, wherein silica gel is added, the mass ratio of the two phosphors is controlled between 0.5-2, the above mixed phosphors are coated on the blue LED chip, and the thickness of the phosphor coating is controlled at Between 70-150 microns.

[0023] Two kinds of fluorescent powders that adopt in the present invention all are common fluorescent powders, and cost is lower than the used fluorescent powder (Ba, Sr) of U.S. Lumileds company 2 Si 5 N 8 :Eu 2+ , without the need for complex and expensive sintering processes. In addition, the two phosphors have strong chemical ...

Embodiment 2

[0025] The LED chip that produces amber light has a structure that the blue LED chip is covered with a phosphor coating, and silica gel is added to the phosphor coating. The phosphor is composed of two phosphors, one is cerium-doped yttrium aluminum garnet red phosphor Y 3 Al 5 o 12 : Ce 3+ , the other is erbium-doped nitride yellow phosphor CaAlSiN 3 :Eu 2+ , the mass ratio of the two phosphors is 1:1, and the thickness of the phosphor coating is 150 microns.

[0026] The covering method of the phosphor powder is as follows: first, the mixture of cerium-doped yttrium aluminum garnet yellow phosphor powder and silica gel is covered on the blue LED chip, and then the mixture of erbium-doped nitride red phosphor powder and silica gel is covered on the blue LED chip . Layered coverage, compared to the one-time coverage of mixing two phosphors as in Example 1, the yellow light produced by the cerium-doped yttrium aluminum garnet yellow phosphor can be more compatible with th...

Embodiment 3

[0031] It is basically the same as Example 2, except that the erbium-doped nitride is (Sr, Ca)AlSiN 3 :Eu 2+ .

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Abstract

The invention relates to an LED chip capable of generating amber light, and belongs to the field of automobiles and traffic control. The structure of the LED chip is that a fluorescent powder coating covers a blue LED chip; the LED chip is characterized in that the fluorescent powder coating comprises two kinds of fluorescent powder, namely cerium-doped yttrium aluminum garnet fluorescent powder Y3Al5O12:Ce<3+> and erbium-doped nitride fluorescent powder CaAlSiN3:Eu<2+> or (Sr, Ca)AlSiN3:Eu<2+>; and blue light emitted from the blue LED chip penetrates through the fluorescent powder coating and is converted into the amber light. The LED chip has the beneficial effects that (1) the luminous flux of the LED chip is not affected by a temperature rise to be significantly reduced, and meanwhile, the luminous flux is also continuously increased when working current is increased; (2) the fluorescent powder coating has very high chemical stability in a high-temperature and high-humidity environment and is not disturbed; (3) the LED chip has very high amber light conversion efficiency and the amber light which is high in purity and high in saturation level can be obtained; and (4) and the manufacturing cost of the LED chip is reduced.

Description

technical field [0001] The invention belongs to the field of automobile and traffic control, in particular to an LED chip for generating amber light applied to automobile lamps or traffic signal lamps. Background technique [0002] Amber (amber color) is a color between yellow and brown, which is widely used in the field of automobiles and traffic control. Also amber. [0003] In the early stage, in order to obtain amber light, an amber LED (light emitting diode, light emitting diode) chip was generally directly selected to generate amber light. Amber LED chips are fabricated from aluminum gallium indium phosphide (AlGaInP) crystals. This kind of chip is called "direct emission type amber LED chip" because it does not need the coverage of phosphor powder. Amber LED chips made of AlGaInP crystals have two disadvantages: one is that as the temperature of the heat sink (diode node temperature) increases, the LED luminous flux decreases significantly; the other disadvantage i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/50
CPCH01L33/504
Inventor 梅泽群
Owner 麦科勒(滁州)新材料科技有限公司