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A kind of fluorescent powder for warm white LED and preparation method thereof

A fluorescent powder and warm white light technology, which is applied in the field of fluorescent powder for LEDs and its preparation, can solve the problems of low luminous intensity of co-doped modified garnet-type phosphors, and improve luminous performance, emission peak intensity, and ability enhanced effect

Active Publication Date: 2020-11-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the technical problem of low luminous intensity of the existing co-doped modified garnet-type phosphor, and provides a phosphor for warm white LED and its preparation method

Method used

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  • A kind of fluorescent powder for warm white LED and preparation method thereof
  • A kind of fluorescent powder for warm white LED and preparation method thereof
  • A kind of fluorescent powder for warm white LED and preparation method thereof

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specific Embodiment approach 1

[0018] Specific embodiment one: the chemical formula of the phosphor powder for warm white light LED of the present embodiment is (Y 3-x Gd x ) 2.93-y-z / 3 al 5 o12 :yCe 3+ , zM, where M is Li + , Zn 2+ , Mg 2+ , Ca 2+ At least one of 0<x≤1.5, 0.06≤y≤0.08, 0<z≤0.15.

specific Embodiment approach 2

[0019] Specific embodiment two: the preparation method of the phosphor powder for warm white light LED described in specific embodiment one, carries out according to the following steps:

[0020] 1. According to the phosphor chemical formula (Y 3-x Gd x ) 2.93-y-z / 3 Al 5 o 12 :yCe 3+ ,zM, the ratio of the amount of substances according to Y:Gd:Al:Ce:M is [(3-x)(2.93-y-z) / 3]:[(2.93-y-z)x / 3]:5:y: The ratio of z to weigh Y 2 o 3 、Gd 2 o 3 、Al 2 o 3 , CeO 2 , the oxide or hydroxide of M, then add an appropriate amount of flux and absolute ethanol, grind and mix evenly, and dry to obtain a mixed powder; wherein M is Li + , Zn 2+ , Mg 2+ , Ca 2+ At least one of them, 02 O;

[0021] 2. Put the mixed powder into a small crucible, put the small crucible into a large crucible, put activated carbon particles in the interlayer between the small crucible and the large crucible to provide a reducing atmosphere, cover the lid and put the double-layer crucible together Put it...

specific Embodiment approach 3

[0023] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the flux in step one is NaF and BaF 2 It is added at a mass ratio of 1:1, and the mass percentage of flux in the mixed powder is 4% to 8%; the others are the same as in the second embodiment.

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Abstract

The invention relates to warm white LED applying fluorescent powder and a preparation method thereof and relates to LED applying fluorescent powder and a preparation method thereof with an aim to mainly solving the technical problem that existing codoped modified garnet type fluorescent powder is low in light intensity. The chemical formula of the fluorescent powder is: (Y3-xGdx)2.93-y-z / 3Al5O12:yCe<3+>, zM, wherein M is at least one of Li<+>, Zn<2+>, Mg<2+> and Ca<2+>. The preparation method includes: weighing oxide or hydroxide of elements according to the molar ratio of Y:Gd:Al:Ce prior to evenly grinding and drying to obtain mixed powder; adding the mixed powder to a crucible, calcining the mixed powder in the reducing atmosphere prior to grinding, washing and drying to obtain the warm white LED applying fluorescent powder. Compared with YAG (yttrium aluminum garnet) fluorescent powder, the warm white LED applying fluorescent powder has the advantages that emission spectrum peak position of the fluorescent powder is 16-40nm in red shift, emission peak intensity is increased by 160-185%, and the fluorescent powder can be used for indoor lighting.

Description

technical field [0001] The invention relates to fluorescent powder for LED and a preparation method thereof. Background technique [0002] With the continuous advancement of semiconductor light-emitting technology, white light-emitting diodes (LEDs) are widely used in various fields such as display lighting, decorative lighting, and LED displays due to their advantages such as higher luminous efficiency, longer life, and more energy-saving and environmental protection. widely. At present, the most widely used and commercialized way to generate white light is that the blue light InGaN chip is covered with a layer of cerium-doped yttrium aluminum garnet phosphor (YAG) that emits yellow light, and white light is obtained by mixing blue light and yellow light. The production method of this kind of white light LED is mature and the cost is low, but because the emission spectrum of YAG:Ce phosphor lacks red light components, the white light produced by compounding with blue LED h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80H01L33/50
CPCC09K11/7774H01L33/504Y02B20/00
Inventor 陈冠英曹宁于泽腾李德洋
Owner HARBIN INST OF TECH