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Lanthanum-based green fluorescent powder for LED (Light-Emitting Diode)

A green phosphor, lanthanum-based technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of demanding production equipment, high cost of raw materials, poor chemical stability, etc., and achieve low cost, simple preparation method, and easy operation. Effect

Inactive Publication Date: 2012-10-31
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicate phosphor has poor chemical stability, is easy to hydrolyze, and has a large light decay after being made into LED, while Eu 2+ Activation of nitrogen oxide green phosphor requires the synthesis of a matrix under high temperature and pressure, which has strict requirements on production equipment, and the cost of raw materials is also very expensive

Method used

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  • Lanthanum-based green fluorescent powder for LED (Light-Emitting Diode)
  • Lanthanum-based green fluorescent powder for LED (Light-Emitting Diode)
  • Lanthanum-based green fluorescent powder for LED (Light-Emitting Diode)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 0.5molLa 2 o 3 , 0.9molLu 2 o 3 , 0.05molCeO 2 , 0.15molBaCO 2 , 2.495molAl 2 o 3 , 0.0005molP 2 o 5 and 0.1mol NH 4 F is used as a flux, the above raw materials are placed in a mixing tank and mixed evenly, the mixture is put into a crucible and placed in a reducing atmosphere furnace, and sintered at 1500 ° C for 6 hours. Afterwards, the obtained powder block is pulverized and ball-milled, and then passed through a 300-mesh sieve to obtain a green fluorescent powder, the expression of which is: (LaLu 1.8 Ba 0.15 Ce 0.05 ) (Al 4.99 P 0.01 )O 12 .

Embodiment 2

[0036] Weigh 0.8molLa 2 o 3 , 0.55molLu 2 o 3 , 0.05molCeO 2 , 0.05molSrCO 2 , 0.05molCaCO 2 , 0.05molBaCO 2 , 2.25molAl 2 o 3 , 0.25molB 2 o 3 and 0.1mol LiF as a flux, put the above raw materials in a mixing tank and mix evenly, put the mixture into a crucible and put it into a reducing atmosphere furnace, and sinter at 1570°C for 8 hours. Carry out ball milling after pulverizing the obtained powder block afterwards, then pass through 300 mesh sieves to obtain green fluorescent powder, and its expression is: (La 1.6 Lu 1.1 Ba 0.05 Sr 0.05 Ca 0.05 Li 0.1 Ce 0.05 ) (Al 4.5 B 0.5 )O 12 .

Embodiment 3

[0038] Weigh 1molLa 2 o 3 , 0.4molLu 2 o 3 , 0.05molCeO 2 , 0.05molCaF 2 , 2.475molAl 2 o 3 ,

[0039] 0.05molSiO 2 and 0.1mol NaF as a flux, put the above raw materials in a mixing tank and mix evenly, put the mixture into a crucible and put it into a reducing atmosphere furnace, and sinter at 1550°C for 2 hours. Carry out ball milling after pulverizing the obtained powder block afterwards, then pass through 300 mesh sieves to obtain green fluorescent powder, and its expression is: (La 2 Lu 0.8 Ca 0.05 Na 0.1 Ce 0.05 ) (Al 4.95 Si 0.05 )O 12 .

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Abstract

The invention provides lanthanum-based green fluorescent powder for an LED (Light-Emitting Diode). The chemical expression formula of the fluorescent powder is (LaxLuyRzCe3-x-y-z)(A15-wTw)O12, wherein the R is one or any more of Ca, Sr, Ba, Li and Na; the T is one or two or thee of B, Mg, Si, Ga or P; the x is equal to 1-2; the y is equal to 0.8-1.8; the z is equal to 0.01-0.2; and the w is equal to 0.001-0.5. The lanthanum-based green fluorescent powder for the LED, disclosed by the invention, can be effectively stimulated by blue light and has the advantages of good photo-thermal stability, high green light-emitting strength, ideal color purity, low cost, no toxin and no pollution.

Description

technical field [0001] The invention belongs to the technical field of solid luminescent materials, and in particular relates to a lanthanum-based green fluorescent powder for LEDs that can be effectively excited by blue light. Background technique [0002] The white light scheme based on blue LED chip to excite yellow light emitting phosphor has the advantages of high luminous efficiency, relatively low cost and simple manufacturing process, and has become the mainstream method of white light LED today. However, due to the insufficient red and green (about 515nm) spectral components in the emission spectrum of the white LED manufactured by this scheme, the color rendering is low, which cannot meet the color rendering requirements of ordinary lighting sources. And through the combination of blue light chips with green phosphors and red phosphors, white light LEDs with a color rendering index exceeding 85 can be obtained, thus laying a solid foundation for the expansion of wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81C09K11/80
Inventor 何锦华符义兵梁超滕小明
Owner JIANGSU BREE OPTRONICS CO LTD