Reversible white-purple photochromism in europium doped Sr3GdLi(PO4)(3)F powders
Reversible white-purple photochromism in europium doped Sr3GdLi(PO4)(3)F powders
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铕掺杂 Sr3GdLi(PO4)(3)F 粉末中的可逆白紫色光致变色
DOI：
10.1016/j.jlumin.2017.02.052
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发表时间：
2017
影响因子：
3.6
通讯作者：
胡义华
中科院分区：
文献类型：
--
作者：
吕洋;金亚洪;王传龙;居桂芳;薛飞洪;胡义华
无机光致变色材料是近年来研究的热点。本文采用传统的固相法合成了一种可逆的白紫色光致变色粉体材料Sr 3GdLi（PO 4）3F：Eu 2+。经紫外光和可见光交替照射（或热处理）后，表面颜色呈现可逆的白紫色变化。漫反射光谱被用来表征包括着色和漂白的光致变色性能。结果表明，Eu 2+的最佳掺杂浓度为0.5mol%左右。通过光致漂白和热致漂白等循环测试表明，Sr_3GdLi（PO_4）_3F：Eu ~（2+）具有良好的耐疲劳性能。根据热释光曲线，讨论了与光致变色性能相关的因素，即陷阱的临界作用和载流子在陷阱间的运动。最后，提出了一个说明光致变色机理的示意图。
Inorganic photochromic materials have attracted growing attention in recent years. Here, a reversible white-purple photochromic powder material Sr3GdLi(PO4)3F:Eu2+was synthesized by conventional solid-state method. The surface color shows reversible white-purple changes after irradiated alternatively by UV and visible light (or thermal treat). Diffuse reflectance spectra were used to characterize the photochromic properties including coloring and bleaching. The results indicated that the optimal Eu2+doping concentration was found to be about 0.5 mol%. Several cycles measurements including photo- and thermal-induced bleaching indicates that Sr3GdLi(PO4)3F:Eu2+posses high fatigue resistance in photochromism performance. Based on thermoluminescence curves, the photochromism property related factors that the critical role of traps and the motion of charge carriers between traps were discussed. Finally, a schematic diagram for illustrating the photochromic mechanism was proposed.