MgAl2O4:Ce荧光粉辐照合成及发光机理研究

doi:10.11962/1006-4990.2019-0094

摘要/Abstract

摘要：

通过伽马射线辐照辅助聚丙烯酰胺凝胶法合成了MgAl₂O₄和MgAl₂O₄:Ce荧光粉。通过X射线粉末衍射仪（XRD）、透射电子显微镜（TEM）、紫外可见分光光度计和荧光分光光度计研究了MgAl₂O₄:Ce荧光粉的晶体结构、表面形貌、光学性质和发光性质;基于实验所获得的结果,分析了纳米级MgAl₂O₄:Ce荧光粉的发光机理。实验结果表明:采用伽马射线辐照辅助聚丙烯酰胺凝胶法制备纯相MgAl₂O₄和MgAl₂O₄:Ce荧光粉的结晶温度要比传统聚丙烯酰胺凝胶法低100 ℃左右;MgAl₂O₄:Ce荧光粉的平均颗粒尺寸为14 nm,Ce离子掺杂后导致样品颗粒细化;Ce离子的掺入,降低了MgAl₂O₄的能带值,改善了其颜色性质和发光性质;当采用275 nm的光去激发MgAl₂O₄:Ce荧光粉时,获得了425 nm和464 nm的蓝光发射。通过能量传递原理分析认为,杂质缺陷（Ce³⁺）在整个发光过程中扮演了重要角色。MgAl₂O₄:Ce作为一种抗辐射能力强的荧光粉,在空间照明领域具有很好的应用前景。

关键词: MgAl₂O₄:Ce荧光粉, 聚丙烯酰胺凝胶法, 颜色性质, 发光性质

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

中图分类号:

O614.33

杨晓红. MgAl₂O₄:Ce荧光粉辐照合成及发光机理研究[J]. 无机盐工业, 2019, 51(9): 30-35.

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

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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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MgAl₂O₄:Ce荧光粉辐照合成及发光机理研究

Irradiation synthesized and photoluminescence mechanism of MgAl₂O₄:Ce phosphor

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