Ce3+, Eu3+共掺Lu3Al5O12多晶的发光特性及能量传递研究

doi:10.15541/jim20140145

摘要/Abstract

摘要：

利用高温固相反应制备了Ce³⁺、Eu³⁺共掺杂的(Ce_0.01Eu_xLu_0.99-_x)₃Al₅O₁₂(x=0.02%、0.5%、1%、2%)多晶粉末, 并对其结构和光谱学特性, 特别是Ce³⁺向Eu³⁺的能量传递问题进行了研究。X射线衍射结果显示, 所制备样品具有单一的石榴石结构。利用X射线激发发射谱和光致激发发射谱研究了Eu³⁺掺入浓度对发光中心Ce³⁺和Eu³⁺离子发光特性的影响以及Ce³⁺向Eu³⁺的能量传递。样品的热释光谱进一步证明Ce³⁺向Eu³⁺的能量传递及其与Eu³⁺浓度之间的变化关系。

关键词: Lu3Al5O12:Ce, Eu, 多晶, 发光特性, 热释光, 能量传递

Abstract:

The (Ce_0.01Eu_xLu_0.99-_x)₃Al₅O₁₂(x=0.2%, 0.5%, 1%, 2%) scintillatingpolycrystalline powderswere prepared by high temperature solid state reaction method, and the sample structure and luminescence property, especially energy transfer between Ce³⁺ and Eu³⁺, were studied. A pure cubic phase was confirmed in all samples by X-ray diffraction (XRD). X-ray excited luminescence (XEL), photoluminescence excitation and emission spectra (PL) were employed to study the influence of increasing Eu³⁺ concentration on the luminescent property of Ce³⁺ and Eu³⁺ as well as the energy transfer from Ce³⁺ to Eu³⁺. The variation of the integral intensity of luminescence of Ce³⁺ in XEL with increasing Eu³⁺ concentration illustrated energy transfer from Ce³⁺ to Eu³⁺. The luminescence behavior of Ce³⁺ and Eu³⁺ in the host of Lu₃Al₅O₁₂ under UV-visible light was studied by PL, and emission peak of Eu³⁺ under 340 nm excitation of Ce³⁺ directly indicated the energy transfer from Ce³⁺ to Eu³⁺. In addition, thermoluminescence spectra (TL) were utilized to identify the energy transfer from Ce³⁺ to Eu³⁺, and also the shifting of the thermoluminescence peaks with Eu³⁺ concentration increasing, was explained by two paths of the electrons transfering from Ce³⁺ to Eu³⁺ under thermal excitation.

Key words: Lu3Al5O12: Ce, Eu, polycrystals, luminescence property, thermoluminescence, energy transfer

中图分类号:

O434

骆家亮, 吴云涛, 任国浩. Ce³⁺, Eu³⁺共掺Lu₃Al₅O₁₂多晶的发光特性及能量传递研究[J]. 无机材料学报, 2014, 29(11): 1211-1217.

LUO Jia-Liang, WU Yun-Tao, REN Guo-Hao. Luminescence Property and Energy Transfer of Ce³⁺, Eu³⁺ Co-doped Lu₃Al₅O₁₂Polycrystals[J]. Journal of Inorganic Materials, 2014, 29(11): 1211-1217.

图/表 9

图1 (Ce0.01EuxLu0.99-x)3Al5O12 (x=0、0.2%、0.5%、1%、2%)样品的XRD图谱

Fig. 1 XRD patterns of samples (Ce0.01EuxLu0.99-x)3Al5O12 (x=0,0.2%,0.5%,1%,2%)

图2 (Ce0.01EuxLu0.99-x)3Al5O12 (x=0、0.2%、0.5%、1%,2%)样品的X射线激发发射图谱

Fig. 2 X-ray excited luminescence spectra of samples (Ce0.01 EuxLu0.99-x)3Al5O12 (x=0, 0.2%, 0.5%, 1%, 2%)

图3 (Ce0.01EuxLu0.99-x)3Al5O12 (x=0、0.2%、0.5%、1%、2%)样品中Ce3+和Eu3+发光的积分强度随着Eu3+浓度的变化

Fig. 3 Integral intensity of luminescence of Ce3+and Eu3+ depending on Eu3+ concentrations in (Ce0.01EuxLu0.99-x)3Al5O12 (x=0,0.2%,0.5%, 1%, 2%)

图4 (Ce0.01EuxLu0.99-x)3Al5O12 (x=0、0.2%、0.5%、1%、2%)样品监测Ce3+离子的紫外可见激发谱(Em=505 nm)和发射谱(Ex=444 nm)

Fig. 4 Photoluminescence excitation (Em=505 nm) and emissi-on (Ex =444 nm) spectra of samples (Ce0.01EuxLu0.99-x)3Al5O12 (x=0, 0.2%, 0.5%, 1%, 2%)

图5 (Ce0.01EuxLu0.99-x)3Al5O12 (x=0、0.2%、0.5%、1%、2%)样品监测Eu3+离子的紫外可见激发谱(Em=590 nm)和发射谱(Ex=393 nm)

Fig. 5 Photoluminescence excitation (Em=590 nm) and emission (Ex=393 nm) spectra of samples (Ce0.01EuxLu0.99-x)3Al5O12 (x=0, 0.2%, 0.5%, 1%, 2%)

图 6 (Ce0.01EuxLu0.99-x)3Al5O12 (x=0、0.2%、0.5%、1%、2%)样品在340 nm激发下的发射谱

Fig. 6 Photoluminescence emission (Ex=340 nm) spectra of (Ce0.01EuxLu0.99-x)3Al5O12 (x=0, 0.2%, 0.5%, 1%, 2%)

图7 (Ce0.01EuxLu0.99-x)3Al5O12 (x=0、0.2%、0.5%、1%、2%)样品中Ce3+离子向Eu3+离子的能量传递图

Fig. 7 Schematic diagram of energy transfer from Ce3+ to Eu3+ in samples (Ce0.01EuxLu0.99-x)3Al5O12 (x=0, 0.2%, 0.5%, 1%, 2%)

图8 (Ce0.01EuxLu0.99-x)3Al5O12 (x=0、0.2%、0.5%、1%、2%)样品二维热释光图谱

Fig. 8 Thermoluminescence spectra (2D) of samples (Ce0.01EuxLu0.99-x)3Al5O12 (x=0, 0.2%, 0.5%, 1%, 2%)

图9 (Ce0.01EuxLu0.99-x)3Al5O12 (x=0、0.2%、0.5%、1%、2%)样品的三维热释光图谱

Fig.9 Thermoluminescence spectra (3D) of samples (Ce0.01EuxLu0.99-x)3Al5O12 (x=0,0.2%,0.5%,1%,2%) (a) Stereogram; (b) Contour

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Ce³⁺, Eu³⁺共掺Lu₃Al₅O₁₂多晶的发光特性及能量传递研究

Luminescence Property and Energy Transfer of Ce³⁺, Eu³⁺ Co-doped Lu₃Al₅O₁₂Polycrystals

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