A kind of highly stable silicate fluorescent powder for LED and preparation method thereof

A high-stability, fluorescent powder technology, applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., can solve the problems of poor moisture and heat resistance stability, achieve strong moisture and heat resistance, strong stability, and make up for coating defects Effect

Active Publication Date: 2019-06-11
HEBEI LIFU CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-stability silicate phosphor powder for LED and its preparation method, so as to solve the problem of poor moisture and heat resistance stability in the existing silicate phosphor powder

Method used

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  • A kind of highly stable silicate fluorescent powder for LED and preparation method thereof
  • A kind of highly stable silicate fluorescent powder for LED and preparation method thereof
  • A kind of highly stable silicate fluorescent powder for LED and preparation method thereof

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Embodiment 1

[0029] The particle structure of the highly stable silicate phosphor powder used in LEDs provided by the present invention includes three parts, which are respectively the raw phosphor powder located in the center of the particle, the intermediate layer coated on the raw phosphor powder, and the intermediate layer wrapped on the intermediate layer. The outer layer; wherein the raw phosphor is silicate phosphor particles doped with silicate matrix with rare earth ions; its general chemical formula is M x (Si, A 2 )O (2+x) :yEu 2+ ,zA 1 3+ or (Sr,Ba) 3 SiO 5 :nEu 2+ , M in the general chemical formula is at least one of Sr, Ba, Mg, Ca, Zn, Cu, Mn, A 1 At least one of Y, La, Sc, Er, without adding A 2 or A 2 Ge, and 1.9≤x≤2.1, 0.005≤y≤0.2, 0.01≤z≤0.2; 0.005≤n≤0.05; the intermediate layer is formed by dehydrating and drying the coupling mixture coated on the raw phosphor powder cladding layer; its outer layer is HfO 2 film layer.

[0030] The preparation process of the...

Embodiment 2

[0033] (1) Take 1000g of raw phosphor Ba 1.9 Mg 0.05 Zn 0.05 SiO 4 :0.06Eu 2+ ,0.04Y 3+ and 4000mL of alcohol, placed in a roller bottle containing 2kg of corundum balls, milled for 60 minutes with the roller bottle, divided into alcohol for 3 times, dried at 80°C for 60 minutes, and passed through a 200-mesh sieve;

[0034] (2) According to the mass ratio of water: ammonia water: alcohol: silane coupling agent: raw phosphor powder 300:2:100:2:50, take by weighing 500g of sieved raw phosphor powder Ba 1.9 Mg 0.05 Zn 0.05 SiO 4 :0.06Eu 2+ ,0.04Y 3+ , 20g silane coupling agent tetraethyl orthosilicate Si(OC 2 h 5 ) 4 , 1000g alcohol, 20g ammonia water, 3000g water, dilute the ammonia water with water, add the sieved raw phosphor powder in the diluted ammonia water, and then mix the alcohol and ethyl orthosilicate Si(OC 2 h 5 ) 4 After mixing, add it to the aqueous phase mixture of the above-mentioned raw material phosphors, stir for 1 hour, then settle, pour off t...

Embodiment 3

[0037] Its method step is the same as embodiment 2, only the material formula of the intermediate layer in step (2) is different: according to water: ammoniacal liquor: alcohol: silane coupling agent: the mass ratio of raw material fluorescent powder 100:4:20:8:20 weighs Take 200g of sieved raw phosphor powder Ba 1.9 Mg 0.05 Zn 0.05 SiO 4 :0.06Eu 2+ ,0.04Y 3+ , 80g silane coupling agent tetraethyl orthosilicate Si(OC 2 h 5 ) 4 , 200g alcohol, 40g ammonia water, 1000g water.

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Abstract

The invention discloses high stability silicate fluorescent powder for an LED. The particle structure of the silicate fluorescent powder comprises three parts: a raw material fluorescent powder in the center of the particle and a middle layer and an outer surface layer successively coating the raw material fluorescent powder, separately; the raw material fluorescent powder is the silicate fluorescent powder particles of a rare earth ion-doped silicate matrix; the middle layer is a coating layer formed by dehydrating and drying a coupling mixed liquid on the raw material fluorescent powder; and the outer surface layer is an HfO2 film. The invention also discloses a specific preparation method of the fluorescent powder. The fluorescent powder provided by the invention is high in humidity resistance. The provided coating method can precisely control the thickness of the outer surface layer while enhancing the light efficiency of the silicate fluorescent powder, so that the service life of silicate in a high-temperature and high-humidity environment is effectively prolonged.

Description

technical field [0001] The invention relates to a fluorescent material and a preparation method thereof, in particular to a highly stable silicate fluorescent powder for LED and a preparation method thereof. Background technique [0002] Silicate phosphor is a type of phosphor widely used in the industry at present. It has rich colors, narrow half-maximum width (FWHM>59nm), wide color gamut (NTSC>90%), high luminous efficiency, and low manufacturing cost. Advantages, which are mainly used in the field of LED lighting. However, there are many problems in the use of commonly produced silicate phosphors. For example, in a hot and humid environment, its surface properties and chemical properties are unstable, and its quenching temperature is low, so it cannot be used for a long time at a higher temperature. , so it can only meet low-end backlight fields, such as: mobile phones, pads and other fields. In order to improve the instability of the surface properties and chemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/59H01L33/50
CPCC09K11/025C09K11/7792H01L33/502
Inventor 杨志平王海龙刘少鹏赵金鑫
Owner HEBEI LIFU CHEM TECH
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