试验优化设计Tm3+/Yb3+共掺钼酸钇钠荧光粉上转换发光性质的研究

为得到最大发光强度的Tm³⁺/Yb³⁺共掺钼酸钇钠荧光粉, 采用试验优化设计的方法建立发光强度与Tm³⁺/Yb³⁺掺杂浓度的回归方程, 再通过遗传算法优化算出方程的最大解. 利用高温固相法制备出了该解的Tm³⁺/Yb³⁺共掺钼酸钇钠荧光粉样品. 在980 nm抽运激发下, 测量了样品的上转换荧光发射谱, 分析了上转换发光机制, 在室温下观察到强烈的蓝光(476 nm)和微弱的红光(649 nm)发射, 其分别对应于Tm³⁺的¹G₄→³H₆ 和¹G₄ →³F₄ 跃迁. 在Tm³⁺/Yb³⁺ 上转换发光体系中, ¹G₄ 的上转换可见发射是双光子合作上转换能量传递过程. 并探讨了样品的温度效应, 发现该样品蓝光发光强度随温度升高而减弱, 并对其温度猝灭机理进行了解释. 关键词： 试验优化设计 上转换 钼酸钇钠 3+/Yb³⁺')" href="#">Tm³⁺/Yb³⁺

Up-conversion luminescence in Tm3+/Yb3+ Co-doped NaY(MoO4)2 phosphors by optimal design of experiments

The method of optimally designing experiments is introduced to study the properties of up-conversion luminescence in Tm³⁺/Yb³⁺ co-doped NaY(MoO₄)₂ phosphors. The design of experiment, data analysis and objective are all optimized. Uniform design is used to seek for the doping concentration range, and quadratic general rotary unitized design is included to build the equation between the luminescent intensity and the Tm³⁺/Yb³⁺doping concentration. In order to obtain the best luminescent intensity, genetic algorithm is introduced into our calculation. The optimal Tm³⁺/Yb³⁺ co-doped NaY(MoO₄)₂ phosphor is synthesized by high temperature solid state method. The up-conversion emission spectrum under the 980 nm laser excitation is detected and the luminescence mechanism is proposed. We observe intense blue light (476 nm) and week red light (649 nm) at room temperature, which are emitted from the Tm³⁺ transition of ¹G₄→³H₆ and ¹G₄→³F₄, respectively. In this up-conversion uminescence system, the up-conversion emission of ¹G₄ is due to the cooperation energy transfer of two photons. We also discuss the temperature effect of the sample, and as the temperature increases its luminescent intensity decreases.
Keywords： optimal design of experiments up-conversion 4)₂')" href="#">NaY(MoO₄)₂ 3+/Yb³⁺')" href="#">Tm³⁺/Yb³⁺