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A kind of eu2+ activated silicate white light phosphor and preparation method thereof

A fluorescent powder and silicate technology, which is applied in the field of fluorescent materials, can solve the problem of white light fluorescent powder not being seen, and achieve good luminous intensity, simple preparation process, and easy-to-produce effect

Active Publication Date: 2014-10-08
扬州科丰高新产业投资开发集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, white light phosphors have not been reported in the literature

Method used

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  • A kind of eu2+ activated silicate white light phosphor and preparation method thereof
  • A kind of eu2+ activated silicate white light phosphor and preparation method thereof
  • A kind of eu2+ activated silicate white light phosphor and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to the chemical formula Na 6 Ca 2.97 Eu 0.03 Si 6 o 18 The stoichiometric ratio of each element in the 2 CO 3 : 1.5897 g, Eu 2 o 3 : 0.0264 g, CaCO 3 : 1.485 g, SiO 2: 1.8015 g. After grinding and mixing uniformly in an agate mortar, choose the air atmosphere for the first calcination, the temperature is 200°C, and the calcination time is 1 hour, then cool to room temperature, and take out the sample. After the first calcined raw materials, the mixture was ground and mixed evenly, and then calcined for the second time in air atmosphere, the calcining temperature was 550°C, and the calcining time was 4 hours, then cooled to room temperature, and the samples were taken out. After the raw material is calcined for the second time, the mixture is ground and mixed evenly, and calcined in a reducing atmosphere at a calcining temperature of 950° C. and a calcining time of 4 hours to obtain the target product.

[0034] See attached figure 1 , which is the X...

Embodiment 2

[0039] According to the chemical formula Na 6 Ca 2.88 Eu 0.12 Si 6 o 18 The stoichiometric ratio of each element in the 2 CO 3 : 1.5897 g, Eu 2 o 3 : 0.1056 g, Ca(OH) 2 : 1.0656 g, SiO 2 : 1.8015 g. After grinding and mixing uniformly in an agate mortar, select the air atmosphere for the first calcination, the temperature is 350°C, and the calcination time is 4.5 hours, then cool to room temperature, and take out the sample. After the first calcination of the raw materials, the mixture was ground and mixed evenly, and then calcined for the second time in an air atmosphere at a calcination temperature of 700°C for 6 hours, then cooled to room temperature, and samples were taken out. After the raw materials are calcined for the second time, the mixture is ground and mixed evenly, and calcined in a reducing atmosphere at a calcining temperature of 900° C. and a calcining time of 6.5 hours to obtain the target product. The main structure, excitation spectrum and lumines...

Embodiment 3

[0041] According to the chemical formula Na 6 Ca 2.79 Eu 0.21 Si 6 o 18 The stoichiometric ratio of each element in, respectively weighed NaOH: 0.6 grams, Eu 2 o 3 : 0.1848 g, Ca(OH) 2 : 1.3023 g, Si(OC 2 h 5 ) 4 : 6.2499 g. After grinding and mixing uniformly in an agate mortar, choose the air atmosphere for the first calcination, the temperature is 500°C, and the calcination time is 10 hours, then cool to room temperature, and take out the sample. After the first calcination of the raw materials, the mixture was ground and mixed evenly, and then calcined for the second time in an air atmosphere, the calcination temperature was 870°C, and the calcination time was 8 hours, then cooled to room temperature, and the samples were taken out. After the raw materials are calcined for the second time, the mixture is ground and mixed evenly, and calcined in a reducing atmosphere at a calcining temperature of 1200° C. and a calcining time of 8 hours to obtain the target produc...

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Abstract

The invention discloses Eu<2+> activated silicate white light fluorescent powder and a preparation method thereof, belonging to the technical field of an inorganic luminescent material. The fluorescent powder is Eu<2+> activated silicate, the chemical formula is Na6Ca(3-3x)Eu3xSi6O18, wherein 0.0001<x<=0.3; under 350-410nm near ultraviolet excitation, the Eu<2+> activated silicate white light fluorescent powder fits well with the transmitting wavelength of a near ultraviolet semiconductor chip; and under near ultraviolet excitation, the fluorescent powder emits bright white light, the luminous intensity is high, and the stability and color rendering property are good. The preparation method disclosed by the invention is simple and has good reproducibility; the obtained product has stable quality; and compared with the existing alkaline earth metal silicate, the sintering temperature is greatly reduced due to the existence of an alkali metal Na in crystal lattice, and the operation and industrial production are easy to realize.

Description

technical field [0001] The present invention relates to a white light fluorescent luminescent material and a preparation method thereof, in particular to a fluorescent powder capable of emitting white light under near-ultraviolet light excitation and a preparation method thereof, which can be applied to white light-emitting diodes (LEDs) excited by near-ultraviolet light Among them, it belongs to the technical field of fluorescent materials. Background technique [0002] Currently, the mature method of obtaining white LEDs is to use blue die-pumped YAG:Ce 3+ Yellow phosphor, using lens principle to mix complementary yellow light and blue light to get white light, but the luminous color of this type of white LED is greatly affected by the input current and phosphor coating thickness, and YAG:Ce 3+ The luminous intensity decreases with the increase of the ambient temperature. In order to solve the above problems, international attempts have been made to use near-ultraviolet (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59
Inventor 黄彦林袁蓓玲韦之豪徐传艳秦琳陶正旭关莹
Owner 扬州科丰高新产业投资开发集团有限公司