Reversible photoluminescence switching in photochromic material Sr6Ca4(PO4)6F2:Eu2+ and the modified performance by trap engineering via Ln3+ (Ln = La, Y, Gd, Lu) co-doping for erasable optical data storage
Reversible photoluminescence switching in photochromic material Sr6Ca4(PO4)6F2:Eu2+ and the modified performance by trap engineering via Ln3+ (Ln = La, Y, Gd, Lu) co-doping for erasable optical data storage
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光致变色材料 Sr6Ca4(PO4)6F2:Eu2 中的可逆光致发光切换以及通过 Ln3 (Ln = La、Y、Gd、Lu) 共掺杂的陷阱工程改进性能，用于可擦除光学数据存储
DOI：
10.1039/d0tc00933d
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发表时间：
2020-05-21
影响因子：
6.4
通讯作者：
Hu, Yihua
中科院分区：
文献类型：
--
作者：
Lv, Yang;Jin, Yahong;Hu, Yihua
基于光致变色的可逆光致发光开关在光开关、防伪、光信息存储等方面有着广泛的应用前景，因而引起了人们的广泛关注。本文报道了一种新型的光致变色材料Sr_6Ca_4（PO_4）_6F_2：Eu ~（2+），该材料具有可逆的光致发光开关特性。在交替的UV光照射和可见光照射或热处理时，分别归因于陷阱捕获和释放电子的着色和漂白可以有效地转换，伴随着粉红色和白色之间的颜色变化。Sr 6Ca 4（PO 4）6 F2：Eu 2+显示出高可逆性和优异的耐疲劳性等光致变色特性。陷阱工程允许通过改变Eu 2+掺杂含量和共掺杂剂Ln 3+（La，Y，Gd，Lu）离子来修改陷阱的有效方式，从而有目的地控制光致变色性能。光致发光开关强烈依赖于光致变色效应，并在几个测量周期后表现出良好的可逆性。从部分热漂白态测得的相对光致发光强度表明了样品所受的最高瞬时温度，表明在瞬时温度记录方面具有良好的应用前景。此外，光致变色材料Sr 6Ca 4（PO 4）6 F2：Eu 2+在紫外光和可见光/热交替处理下可重复记录各种图案，在可擦除光数据存储方面具有潜在的应用前景。
Reversible photoluminescence switching based on photochromism has drawn considerable interest due to its widespread promising applications in photo-switching, anti-counterfeiting and optical information storage. In this paper, we reported a novel photochromic material Sr6Ca4(PO4)6F2:Eu2+ which exhibits the reversible photoluminescence switching ability. Coloration and bleaching, which are attributed to the capture and release of electrons by traps, respectively, can be efficiently converted accompanied by the color change between pink and white upon alternating UV light irradiation and visible light irradiation or thermal treatment. Sr6Ca4(PO4)6F2:Eu2+ shows photochromic properties such as high reversibility and excellent fatigue resistance. Trap engineering allows an effective way to modify the traps through changing the Eu2+ doping content and co-dopant Ln3+ (La, Y, Gd, Lu) ions, thereby purposely controlling the performance of photochromism. Photoluminescence switching strongly depends on the photochromic effect and exhibits a good reversibility after several cycles of measurements. The relative photoluminescence intensity measured from a partially thermal bleaching state indicates the highest instantaneous temperature suffered by the sample, indicating the good application prospects in instantaneous temperature recording. In addition, various patterns can be repeatedly recorded in the photochromic material Sr6Ca4(PO4)6F2:Eu2+ by alternative UV light and visible light/heat treatment, demonstrating potential application in erasable optical data storage.