无机化学学报

试验优化设计Er³⁺-Yb³⁺共掺杂Gd₂Ti₂O₇上转换发光特性

Upconversion Luminescence Properties of Er³⁺-Yb³⁺ Co-doped Gd₂Ti₂O₇ by Optimal Experiment Design

作者	单位	E-mail
吴金磊	大连海事大学物理系, 大连 116026 大连民族大学物理与材料工程学院, 大连 116600
孙佳石	大连海事大学物理系, 大连 116026	sunjs@dlmu.edu.cn
曹保胜	大连民族大学物理与材料工程学院, 大连 116600	bscao@dlnu.edu.cn
李树伟	大连海事大学物理系, 大连 116026
李香萍	大连海事大学物理系, 大连 116026
张金苏	大连海事大学物理系, 大连 116026
程丽红	大连海事大学物理系, 大连 116026
陈宝玖	大连海事大学物理系, 大连 116026

摘要: 采用溶胶-凝胶（Sol-gel）法制备了Er³⁺-Yb³⁺共掺杂Gd₂Ti₂O₇纳米晶粉末，通过试验优化设计的理论建立了Er³⁺-Yb³⁺掺杂浓度与发光强度的回归方程，利用遗传算法优化计算出方程的最优解Er³⁺、Yb³⁺掺杂浓度分别为5.60%（物质的量分数）和13.43%。Er³⁺-Yb³⁺共掺杂Gd₂Ti₂O₇纳米晶粉末为单一面心立方Gd₂Ti₂O₇相结构，随Yb³⁺共掺杂浓度增加，X射线衍射峰逐渐向高角偏移。在976 nm激光激发下，Er³⁺-Yb³⁺共掺杂Gd₂Ti₂O₇获得了分别对应于Er³⁺的²H_11/2/⁴S_3/2→⁴I_15/2和⁴F_9/2→⁴I_15/2跃迁的绿色和红色上转换发光，且绿色和红色发光均为双光子吸收过程。研究了最优样品上转换发光与温度之间的关系，发现绿色上转换发光具有优良的温度传感特性，对红色上转换发光的温度猝灭进行了解释。

关键词: 试验优化设计上转换发光溶胶-凝胶法 Er³⁺-Yb³⁺共掺杂温度

基金项目: 国家自然科学基金（No.11004021）、辽宁省高等学校优秀人才支持计划和中央高校基本科研业务费专项资金（No.DC201502080202）资助项目。

Abstract: Er³⁺-Yb³⁺ co-doped Gd₂Ti₂O₇ powders were prepared by Sol-gel method. The optimal experiment design theory was used to build the regression equation between the luminescent intensity and the Er³⁺-Yb³⁺ doping concentration. Calculated by genetic algorithm, the optimal concentrations of Er³⁺ and Yb³⁺ solution were 5.60% (mole percentage) and 13.43%, respectively. Er³⁺-Yb³⁺ codoped Gd₂Ti₂O₇ powders were characteristic of a typical face-centered cubic crystal phase, and the X-ray diffraction peaks shift toward higher angles with increasing Yb³⁺ concentration. Under 976 nm laser diode excitation, both green and red upconversion emissions were observed, corresponding to the Er³⁺ transitions of ²H_11/2/⁴S_3/2→⁴I_15/2 and ⁴F_9/2→⁴I_15/2. The two-photon absorption upconversion process was responsible for the green and red emissions. The effect of temperature on green and red upconversion emissions from the optimal sample was studied, indicating that the green upconversion emissions have the optimized temperature sensing properties. The temperature-dependent red upconversion emissions were interpreted by the thermal quenching theory.

Keywords: optimal experiment design upconversion emission sol-gel Er³⁺-Yb³⁺co-doped temperature

投稿时间：2016-01-05 修订日期：2016-04-24

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吴金磊,孙佳石,曹保胜,李树伟,李香萍,张金苏,程丽红,陈宝玖.试验优化设计Er³⁺-Yb³⁺共掺杂Gd₂Ti₂O₇上转换发光特性[J].无机化学学报,2016,32(9):1519-1525.

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