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Method for inhibiting quantity of Eu < 3 + > in fluorescent powder

A fluorescent powder and quantity technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of insufficient conversion degree, and achieve the effect of simple operation, which is conducive to large-scale production and application promotion.

Active Publication Date: 2021-08-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, Eu 3+ The existence of Eu 3+ to Eu 2+ is not converting enough

Method used

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  • Method for inhibiting quantity of Eu &lt; 3 + &gt; in fluorescent powder
  • Method for inhibiting quantity of Eu &lt; 3 + &gt; in fluorescent powder
  • Method for inhibiting quantity of Eu &lt; 3 + &gt; in fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Ba 0.945 Er 0.01 Si 2 o 2 N 2 :0.04Eu 2+ The preparation process is as follows:

[0034] Weigh BaCO according to the stoichiometric ratio of 1.89:0.04:0.01:1:1 molar ratio 3 、Eu 2 o 3 , Er 2 o 3 , SiO 2 and Si 3 N 4 , after grinding and mixing evenly, the obtained mixture was sintered at 1400°C under a reducing atmosphere of hydrogen for 6h, cooled to room temperature, and ground to obtain Ba 0.945 Er 0.01 Si 2 o 2 N 2 :0.04Eu 2+ .

[0035] Compared with Example 1, the raw material components and proportions, sintering temperature and time are different in Examples 2-14, see Table 1 for details.

[0036] The raw material component BaCO that adopts in above-mentioned comparative example 1-3, embodiment 1-14 3 、Eu 2 o 3 , M 2 o 3 All are of analytical grade, SiO 2 and Si 3 N 4 It is a spectrally pure grade. The control parameters of the preparation process in Comparative Examples 1-3 and Examples 1-14, and the spectral data of the prepared phos...

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Abstract

The invention provides a method for inhibiting the quantity of Eu < 3 + > in BaSi2O2N2: Eu < 2 + > fluorescent powder, and belongs to the technical field of synthesis of luminescent materials. The raw materials for preparing the BaSi2O2N2: Eu < 2 + > fluorescent powder comprise trivalent metal oxide M2O3, and M is at least one of Er, Dy and Tm. The trivalent metal oxide M2O3 is added into the synthesis raw materials to promote conversion of Eu < 3 + > to Eu < 2 + > in the high-temperature sintering process. The content of the raw material components BaCO3, Eu2O3, M2O3, SiO2 and Si3N4 for preparing the fluorescent powder is controlled, so that the quantity of Eu < 3 + > in the BaSi2O2N2: Eu < 2 + > fluorescent powder can be sharply reduced to 3% of the original quantity (the BaSi2O2N2: Eu < 2 + > fluorescent powder without M2O3 in the raw materials thereof). The blue-violet light absorptivity of Eu < 2 + > can be improved to 75% from 61% of the original BaSi2O2N2: Eu < 2 + > fluorescent powder without M2O3 in the raw materials thereof, the blue-violet light absorptivity is improved by 23%, the quantity of Eu < 2 + > in the fluorescent powder is greatly increased, and the blue-violet light absorptivity of the fluorescent powder is improved. The method for inhibiting the quantity of Eu < 3 + > in the BaSi2O2N2: Eu < 2 + > fluorescent powder is simple to operate, and is also beneficial to large-scale production, application and popularization.

Description

technical field [0001] The invention belongs to the technical field of luminescent material synthesis, and relates to a method for suppressing BaSi 2 o 2 N 2 :Eu 2+ Eu in phosphor powder 3+ method of quantity. Background technique [0002] The common valence states of rare earth europium (Eu) ions are divalent (Eu 2+ ) and trivalent (Eu 3+ ), these two valence states of europium ions are excellent luminescent centers. Eu 2+ The emission of Eu belongs to the d-f transition, and the luminous color depends on the host material. In different hosts, the luminescence from ultraviolet to near-infrared can be realized; Eu 3+ The emission belongs to the f-f transition, showing red emission, and the emission color is not affected by the matrix. [0003] BaSi 2 o 2 N 2 :Eu 2+ It is a cyan phosphor that absorbs blue-violet light and converts it into cyan light. White light-emitting diode (LED) lighting sources currently have the problem of insufficient blue light, which le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
CPCC09K11/7792C09K11/0883
Inventor 张家骅刘雪晴张亮亮吴昊武华君潘国徽
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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