MgAl2O4:Ce荧光粉辐照合成及发光机理研究

doi:10.11962/1006-4990.2019-0094

Abstract

Abstract:

MgAl₂O₄ and MgAl₂O₄:Ce phosphors were successfully synthesized through a gamma-ray irradiation assisted polyacrylamide gel route.The crystal structure,surface morphology,optical and photoluminescence properties of MgAl₂O₄:Ce phosphors were studied by X-ray powder diffraction（XRD）,transmission electron microscopy（TEM）,ultraviolet-visible spectrophotometer and fluorescence spectrophotometer.Based on the experimental results,the photoluminescence mechanism of nanoscale MgAl₂O₄:Ce phosphors was analyzed.Experiment result showed that the crystallization temperature of MgAl₂O₄ and MgAl₂O₄:Ce phosphors synthesized by a gamma-ray irradiation assisted polyacrylamide gel route was lower about 100 ℃ than that of the conventional polyacrylamide gel route.The mean particle size of the MgAl₂O₄:Ce phosphor was 14 nm.Cerium doping MgAl₂O₄ decreased the particle size and E_g value,improved the colour and photoluminescence properties of MgAl₂O₄.Two blue emission peaks at 425 nm and 465 nm were observed for the MgAl₂O₄:Ce phosphor when the excitation peak was 275 nm.The impurity defect（Ce³⁺） played a crucial role in the luminescence process on the basis of the energy transfer mecha nism.The MgAl₂O₄:Ce phosphor can be used as a promising radiation resistance phosphor for space lighting field.

Key words: MgAl₂O₄:Ce phosphor, polyacrylamide gel route, colour properties, photoluminescent properties

CLC Number:

O614.33

Yang Xiaohong. Irradiation synthesized and photoluminescence mechanism of MgAl₂O₄:Ce phosphor[J]. Inorganic Chemicals Industry, 2019, 51(9): 30-35.

Figures/Tables 8

References 29

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样品	颜色坐标						E_g/ eV
样品	L*	a*	b*	c*	H°	E*_CIE	E_g/ eV
MgAl₂O₄	98.263	-0.313	2.729	2.747	-83.457	98.301	3.933
MgAl₂O₄:Ce	98.017	-4.147	13.715	14.328	-73.175	99.059	3.207

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Inorganic Acid-Base-Salt Committee of CIESC

Irradiation synthesized and photoluminescence mechanism of MgAl₂O₄:Ce phosphor

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Irradiation synthesized and photoluminescence mechanism of MgAl2O4:Ce phosphor