Silicate-based red phosphor for LED and preparation method of silicate-based red phosphor

A technology of red fluorescent powder and silicate, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve problems such as cold color temperature, achieve good matching, good thermal stability, and improve luminous efficiency

Active Publication Date: 2018-12-14
JINGDEZHEN CERAMIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the cold color temperature in the existing LEDs, and provide a silicate-based red fluorescent powder for LEDs with low cost, simple preparation process, wide application range and stable performance and its preparation method

Method used

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  • Silicate-based red phosphor for LED and preparation method of silicate-based red phosphor
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  • Silicate-based red phosphor for LED and preparation method of silicate-based red phosphor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] When x=0.5, y=0.45, the chemical formula of red phosphor is Ba 2 La 4 Y 3.6 Eu 0.4 (SiO 4 ) 6 o 2According to the stoichiometric ratio of each element in the chemical formula, weigh 0.631g of barium carbonate, 1.043g of lanthanum oxide, 0.650g of yttrium oxide, 0.113g of europium oxide, and 0.577g of silicon oxide; put the weighed raw materials into an agate mortar and grind After 0.5 hours, a uniform mixture is obtained. Put the obtained mixture into a dry corundum crucible, put the crucible into a muffle furnace, and heat treat it in an air atmosphere. The heat treatment system is: heat up from room temperature at a rate of 3°C / min To 1450°C, keep it warm for 6h, cool naturally with the furnace to obtain a block product, and grind the block product to obtain the final Ba 2 La 4 Y 3.6 Eu 0.4 (SiO 4 ) 6 o 2 Red phosphor, the chromaticity coordinates of the red phosphor are (0.6293, 0.3685).

Embodiment 2

[0025] When x=0.5, y=0.4, the chemical formula of red phosphor is Ba 2 La 3.2 Y 4 Eu 0.8 (SiO 4 ) 6 o 2 According to the stoichiometric ratio of each element in the chemical formula, weigh 0.631g of barium carbonate, 0.834g of lanthanum oxide, 0.723g of yttrium oxide, 0.225g of europium oxide, and 0.577g of silicon oxide; put the weighed raw materials into an agate mortar and grind After 1 hour, a uniform mixture was obtained. Put the obtained mixture into a dry corundum crucible, put the crucible into a muffle furnace, and heat treat it under an air atmosphere. To 1450°C, keep it warm for 7 hours, cool naturally with the furnace to obtain a block product, and grind the block product to obtain the final Ba 2 La 3.2 Y 4 Eu 0.8 (SiO 4 ) 6 o 2 Red fluorescent powder, the chromaticity coordinates of the red fluorescent powder are (0.64, 0.3596).

Embodiment 3

[0027] When x=0.35, y=0.5, the chemical formula of red phosphor is Ba 2 La 4 Y 2.8 Eu 1.2 (SiO 4 ) 6 o 2 According to the stoichiometric ratio of each element in the chemical formula, weigh 0.631g of barium carbonate, 1.043g of lanthanum oxide, 0.506g of yttrium oxide, 0.338g of europium oxide, and 0.577g of silicon oxide; put the weighed raw materials into an agate mortar and grind After 0.5 hours, a uniform mixture is obtained. Put the obtained mixture into a dry corundum crucible, put the crucible into a muffle furnace, and heat treat it in an air atmosphere. The heat treatment system is: heat up from room temperature at a rate of 5°C / min to 1500°C, keep it warm for 8 hours, and cool naturally with the furnace to obtain a block product, and grind the block product to obtain the final Ba 2 La 4 Y 2.8 Eu 1.2 (SiO 4 ) 6 o 2 Red phosphor, the chromaticity coordinates of the red phosphor are (0.6371, 0.3619).

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Abstract

The invention discloses a silicate-based red phosphor for LED and a preparation method of the silicate-based red phosphor. A silicate of a novel apatite, Ba2Y4La4(SiO4)6O2, is used as an initial substrate, by adding luminescent ion Eu<3+> ions and adjusting the ratio of La<3+> ions to Y<3+> ions, a red phosphor Ba<2>(Y<x>La<y>Eu<1-x-y>)<8>(SiO<4>)<6>O<2> is obtained, wherein the sum of x and y issmaller than 1. The phosphor has the characteristics that the phosphor obtains good luminescence performance by adjusting the relative content of Y<3+> ions and La<3+> ions to regulate the coordination environment of Eu<3+> ions. The red phosphor provided by the invention can emit bright red light in a range of 617-619 nm under near-ultraviolet excitation, and the phosphor has high luminous efficiency and good thermal stability. The afterglow time is short, the physical and chemical performance is stable, the preparation raw materials are cheap and easy to obtain, the method is simple and easyto repeat, and is beneficial to industrial production, and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of luminescent materials, in particular to a trivalent europium ion Eu 3+ The activated novel silicate-based apatite structure red phosphor and its preparation method can be used as red phosphor in LED. Background technique [0002] WLED is considered to be the most ideal solid-state lighting source for the next generation due to its advantages of environmental protection and energy saving, simple structure, good color rendering performance, high brightness, long life, and fast response. Modern LED technology mainly combines GaInN blue LED chips with yellow phosphor YAG:Ce 3+ However, due to the lack of red light components, this kind of LED has low color rendering index (CRI) and high color temperature (CCT), which makes it more and more difficult to meet the needs of lighting. With the rapid development of light-emitting diodes, people have developed a more effective LED implementation scheme, that is, using near-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79
CPCC09K11/7792
Inventor 江莞王三海陈婷江伟辉刘健敏徐彦乔王连军
Owner JINGDEZHEN CERAMIC UNIV
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