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Gallate red fluorescent powder for white light LED as well as preparation method thereof

A technology of red phosphor and gallate, applied in the field of gallate red phosphor and its preparation, can solve the problems of unsatisfactory color rendering and color temperature value, lack of red light part, low color rendering index of white LED, etc., to achieve The preparation process is simple, the chemical stability is good, and the effect of high luminous intensity is

Active Publication Date: 2019-12-20
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of red light part, it often leads to unsatisfactory color rendering and color temperature value
[0004] Another kind of luminescent material that uses ultraviolet light chips to excite three colors of red, green and blue to obtain white light, which achieves better color rendering of white light and can achieve white light emission with low color temperature. Due to the lack of efficient and high-brightness materials that can be excited by ultraviolet light , Red luminescent material with good chemical stability, resulting in low color rendering index of white LED

Method used

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  • Gallate red fluorescent powder for white light LED as well as preparation method thereof
  • Gallate red fluorescent powder for white light LED as well as preparation method thereof
  • Gallate red fluorescent powder for white light LED as well as preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A kind of gallate red phosphor powder for white light LED, its general chemical formula is La 0.8 Eu 0.2 SrGaO 4 , the preparation method is as follows:

[0035] S1. Prepare 0.01mol sample, weigh lanthanum oxide La 2 o 3 : 1.3033g, strontium carbonate SrCO 3 : 1.4912g, gallium oxide Ga 2 o 3 : 0.9372g, europium oxide Eu 2 o 3 : 0.3519g; fully grind and mix to obtain mixed powder;

[0036] S2. Put the mixed powder in a corundum crucible, put it into a muffle furnace for sintering under oxidation conditions, the sintering temperature is 1400°C, the heating rate is 10°C / min, and the sintering time is 8 hours; after natural cooling to room temperature, The obtained product is taken out, and the gallate red phosphor powder can be obtained after grinding.

Embodiment 2

[0038] The general chemical formula of the gallate red phosphor powder used for white light LED in this embodiment is La 0.9 Eu 0.1 SrGaO 4 , the preparation method is as follows:

[0039] S1. Prepare 0.01mol sample, weigh lanthanum oxide La 2 o 3 : 1.4462g, strontium carbonate SrCO 3 : 1.4912g, gallium oxide Ga 2 o 3 : 0.9372g, europium oxide Eu 2 o 3 : 0.1759g; fully grind and mix to obtain mixed powder;

[0040] S2. Put the mixed powder in a corundum crucible, put it into a muffle furnace for sintering under oxidation conditions, the sintering temperature is 1300°C, the heating rate is 8°C / min, and the sintering time is 4 hours; after natural cooling to room temperature, The obtained product is taken out, and the gallate red phosphor powder can be obtained after grinding.

Embodiment 3

[0042] The general chemical formula of the gallate red phosphor powder used for white light LED in this embodiment is La 0.7 Eu 0.3 SrGaO 4 , the preparation method is as follows:

[0043] S1. Prepare 0.01mol sample, weigh lanthanum oxide La 2 o 3 : 1.1404g, strontium carbonate SrCO 3 : 1.4912g, gallium oxide Ga 2 o 3 : 0.9372g, europium oxide Eu 2 o 3 : 0.5278g; fully grind and mix to obtain mixed powder;

[0044] S2. Put the mixed powder in a corundum crucible, put it into a muffle furnace for sintering under oxidation conditions, the sintering temperature is 1450°C, the heating rate is 7°C / min, and the sintering time is 10 hours; after natural cooling to room temperature, The obtained product is taken out, and the gallate red phosphor powder can be obtained after grinding.

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Abstract

The invention discloses gallate red fluorescent powder for a white light LED. The chemical general formula of the gallate red fluorescent powder is La1-xMxSrGaO4, wherein M is Eu or Pr, and x is morethan 0 and less than or equal to 1. The gallate red fluorescent powder provided by the invention is prepared by taking LaSrGaO4 as a substrate and doping rare earth ions Eu<3+> or Pr<3+> through high-temperature solid-phase reaction. The gallate red fluorescent powder can emit bright red light under ultraviolet excitation and has high light-emitting intensity; furthermore, physical and chemical stability is high, raw materials are easily available, and the preparation process is simple, pollution-free to the environment and suitable for large-scale production. The red fluorescent powder can bematched with blue and green fluorescent powder to realize ultraviolet excitation on the white light LED, and has application value in the field of the white light LED.

Description

technical field [0001] The invention relates to the technical field of rare earth luminescent materials, and more specifically, to a gallate red fluorescent powder for white LEDs and a preparation method thereof. Background technique [0002] Because of its high efficiency, long life, energy saving, green environmental protection and many other advantages, white LED has been widely concerned by people. [0003] At present, the most widely used and mature white light LED technology in the market is phosphor conversion type, one of which is composed of blue LED and yellow phosphor that can be effectively excited by blue light, in which blue LED and a layer of yellow light-emitting YAG :Ce phosphor-combined white light LEDs are mainly used as commercial white light LEDs. However, due to the lack of red light, it often leads to unsatisfactory color rendering and color temperature values. [0004] Another kind of luminescent material that uses ultraviolet light chips to excite ...

Claims

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Application Information

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IPC IPC(8): C09K11/80
CPCC09K11/7787C09K11/7769Y02B20/00
Inventor 谢伟高玲英莫有伟陈航邹长伟谢木标
Owner LINGNAN NORMAL UNIV
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