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A kind of silicate-based red fluorescent powder for LED and preparation method thereof

A red phosphor, silicate technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as cold color temperature, achieve good matching, good thermal stability, and improve color purity.

Active Publication Date: 2021-06-15
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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  • A kind of silicate-based red fluorescent powder for LED and preparation method thereof
  • A kind of silicate-based red fluorescent powder for LED and preparation method thereof
  • A kind of silicate-based red fluorescent powder for LED and preparation method thereof

Examples

Experimental program
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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 phosphor, the chromaticity coordinates of the red phosphor 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 fluorescent powder for LEDs and a preparation method thereof, which uses silicate Ba with a new type of apatite structure 2 Y 4 La 4 (SiO 4 ) 6 o 2 As an initial matrix, by adding luminescent ions Eu 3+ ions, and adjust La 3+ ion and Y 3+ The ratio of ions to get the red phosphor Ba 2 (Y x La y Eu 1‑x‑y ) 8 (SiO 4 ) 6 o 2 , where x+y<1; the phosphor is characterized by adjusting Y 3+ Ions and La 3+ The relative content of ions regulates the Eu 3+ The coordination environment of ions can obtain better luminescence performance. The red fluorescent powder provided by the present invention can emit bright red light in the range of 617-619 nm under near-ultraviolet excitation. The fluorescent powder has high luminous efficiency, good thermal stability, short afterglow time, stable physical and chemical properties, and cheap and easy preparation raw materials. The method is simple and easy to repeat, which 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 Patents(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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