Europium-activated silicate green fluorescent powder and application thereof in white light-emitting diode

A technology of green fluorescent powder and silicate, which is applied in the direction of luminescent materials, the use of gas discharge lamps, sustainable buildings, etc., can solve the problems of temperature quenching characteristics, particle size and distribution improvement, etc., and achieve the improvement of temperature quenching characteristics , improve lattice stability, enhance the effect of emission intensity

Active Publication Date: 2010-10-06
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing technology can improve the light efficiency of phosphor to a certain extent, it is difficult to further improve its temperature quenching characteristics, particle size and distribution

Method used

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  • Europium-activated silicate green fluorescent powder and application thereof in white light-emitting diode
  • Europium-activated silicate green fluorescent powder and application thereof in white light-emitting diode
  • Europium-activated silicate green fluorescent powder and application thereof in white light-emitting diode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh SrCO 3 4.92g, BaCO 3 252.6g, Sc 2 o 3 0.23g, SiO 2 30.4g, Eu 2 o 3 2.35g, LiF0.35g, AlN0.15g, mix well and put into a corundum crucible, burn at 1000°C for 10h, crush the burnt product, pass through a 350 sieve, add to a citric acid solution with a mass percentage of 0.12% , prepared into a suspension with a mass percentage of 10%, heated to 80°C, stirred for 60 minutes while keeping warm, washed with deionized water until neutral, separated from water and powder, and dried to obtain the composition of Ba 1.925 Sr 0.05 sc 0.005 Si 0.76 o 3.52 :Eu 0.02 green phosphor.

Embodiment 2

[0046] Weigh SrCO 3 5.91g, BaCO 3 250.2g, Y 2 o 3 0.6g, SiO 2 32g, Eu 2 o 3 3.52g, LiF0.35g, AlN0.15g, mix well and put into corundum crucible, burn at 1100°C for 6h, then crush the burnt product, sieve and add to citric acid solution with a mass percentage of 1.05% , prepared into a suspension with a mass percentage of 15%, heated to 75°C, stirred for 90 minutes while keeping warm, washed with deionized water until neutral, separated from water and powder, and dried to obtain the chemical composition of Ba 1.90 2Sr 0.06 Y 0.008 Si 0.8 o 3.6 :Eu 0.03 Green phosphor.

Embodiment 3

[0048] Weigh SrCO 3 5.91g, BaCO 3 244.7g, La 2 o 3 3.26g, SiO 2 36g, Eu 2 o 3 3.52g, LiF0.44g, AlN0.15g, mix them evenly, put them into a corundum crucible, burn them at 920°C for 10h, crush the burnt products, sieve them and add them to a citric acid solution with a mass percentage of 1.23% , prepared into a suspension with a mass percentage of 18%, heated to 100°C, stirred for 110 minutes while keeping warm, washed with deionized water until neutral, separated from water and powder, and dried to obtain the chemical composition of Ba 1.86 Sr 0.06 La 0.03 Si 0.9 o 3.8 : Eu0.05 green phosphor.

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Abstract

The invention relates to europium-activated silicate green fluorescent powder and the application thereof in a white light-emitting diode, which as excellent luminous performance and temperature quenching property. The chemical structural formula of the europium-activated silicate green fluorescent powder is shown in a formula (i): Ba(2-x-y-p)SrxMpSiqO(2+2q):Euy(i), wherein M is at least one of Sc, Y, La, Cr or Er; x is more than 0.03 and less than or equal to 0.75; y is more than 0.001 and less than or equal to 0.09; p is more than or equal to 0.0003 or less than or equal to 0.05; and q is more than or equal to 0.75 and less than 1. The europium-activated silicate green fluorescent powder can be widely applied to white light-emitting diodes. In the europium-activated silicate green fluorescent powder, bivalent europium is taken as a main activator, and trace elements, such as Sc, Y and La and / or co-activators, such as Cr and Er are doped, so the emitting intensity of the fluorescent powder is effectively enhanced and the temperature quenching property of the fluorescent powder is remarkably improved.

Description

technical field [0001] The invention relates to a europium-activated silicate green fluorescent powder and its application in white light emitting diodes. Background technique [0002] White light-emitting diodes (referred to as white LEDs) have significant advantages over traditional light sources in terms of size, life, environmental protection, and energy saving. Therefore, they are expected to become the fourth-generation green lighting sources that replace compact energy-saving lamps. GaN blue LEDs and Y 3 al 5 o 12 : Ce 3+ (YAG:Ce) yellow light-emitting phosphor as a light conversion material to achieve white light technology has become the mainstream of the current white LED, and has increasingly attracted the attention of researchers all over the world. For example, US patents US5998925 and US6614179B1 adjusted and optimized the Y / Gd ratio, Al / Ga ratio, trace element doping and preparation methods. [0003] According to the latest technical reports, the luminous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79C09K11/68H01L33/50
CPCY02B20/181Y02B20/00
Inventor 梁超何锦华符义兵
Owner JIANGSU BREE OPTRONICS CO LTD
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