Design and control of the coloration degree for photochromic Sr3GdNa(PO4)(3)F:Eu2+ via traps modulation by Ln(3+) (Ln=Y, La-Sm, Tb-Lu) co-doping
Design and control of the coloration degree for photochromic Sr3GdNa(PO4)(3)F:Eu2+ via traps modulation by Ln(3+) (Ln=Y, La-Sm, Tb-Lu) co-doping
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Ln(3)（Ln=Y、La-Sm、Tb-Lu）共掺杂陷阱调制光致变色Sr3GdNa(PO4)(3)F:Eu2的设计和着色度控制
DOI：
10.1016/j.snb.2017.01.129
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发表时间：
2017
影响因子：
8.4
通讯作者：
胡义华
中科院分区：
文献类型：
--
作者：
金亚洪;吕洋;王传龙;居桂芳;吴浩怡;胡义华
Eu ~（2+）掺杂的Sr_3GdNa（PO_4）_3F属于黑云母型卤代磷酸盐，在紫外光（200-320 nm）和可见光（或热处理）交替照射下，可显示可逆的无色蓝绿色光致变色（PC）。这种观察表明，已经获得了双P-/T-型光致变色材料，这使得它在光开关、可擦除光存储介质、成像和传感器领域具有潜在的应用前景。可逆PC具有高抗疲劳性和长寿命的特点。着色和漂白分别归因于随着F心的形成和俘获电子的释放，电子被不同的陷阱沿着俘获。基于“陷阱调制”的概念，通过改变Eu ~（2+）的含量或与Ln ~（3+）（Ln = Y，La-Sm，Tb-Lu）离子共掺杂，设计了一种简单、通用的方法来控制光致变色行为，为改变信息写入和阅读的密度提供了一条途径。此外，利用热释光（TL）和电子自旋共振（ESR）技术，还提出了PC机制的能级示意图。
Eu2+-doped Sr3GdNa(PO4)3F, belonging to belovite-type halo-phosphate, is able to display reversible colorless-cyan photochromism (PC) when irradiated alternatively by UV (200–320 nm) and visible light (or thermal treatment). Such an observation delivers that a dual P-/T-type photochromic material has been obtained, which makes it potential to be used in the field of photo switchers, erasable optical memory media, imaging and sensors. The reversible PC shows high fatigue resistane and long-lived features. The coloration and bleaching is attributed to the capture of elctrons by different traps along with the formation of F-centers and the releasing of the trapped electrons, respectively. It allows us to design a straightforward and universal method to control the photochromic behavior via changing the Eu2+contents or co-doping with Ln3+(Ln = Y, La-Sm, Tb-Lu) ions on the basis of the concept “traps modulation”, which paves a way to modify the density of information writing and reading. In addition, with the thermoluminescence (TL) and electron spin resonance (ESR) techniques, an energy level schematic for PC mechanism is also proposed.