Water-assistant ultrahigh fluorescence enhancement in perovskite polymer-encapsulated film for flexible X-Ray scintillators
Water-assistant ultrahigh fluorescence enhancement in perovskite polymer-encapsulated film for flexible X-Ray scintillators
复制标题
用于柔性 X 射线闪烁体的钙钛矿聚合物封装薄膜的水辅助超高荧光增强
DOI：
10.1016/j.cej.2022.139132
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发表时间：
2022
影响因子：
15.1
通讯作者：
Zhijun Zhang
中科院分区：
文献类型：
--
作者：
Yue Li;Qian-Li Li;Yan Li;Yun-Ling Yang;Shao-Lin Zhang;Jingtai Zhao;Jieqiong Wan;Zhijun Zhang
• 筛选出疏水性RTV-2 聚合物用于封装MAPbBr 3 。 • MAPbBr 3 /RTV-2 薄膜实现了显着的水辅助荧光增强。 • 阐明了水诱导荧光增强的机制。 • 该薄膜在用于剂量监测的柔性X射线闪烁体方面具有巨大潜力。众所周知，甲基铵卤化铅钙钛矿对水分的稳定性较差。水会导致离子钙钛矿降解，并削弱钙钛矿器件的光学和电子性能。提高水分稳定性的主要策略是成分工程、表面工程和基质封装。在此，封装策略是通过筛选聚合物基质、疏水性室温硫化硅橡胶（RTV-2）来实现的。由于适量的水对钙钛矿性能的积极影响，对所得MAPbBr 3 /RTV-2复合薄膜进行水后处理进行表面工程。该复合膜实现了显着的8倍荧光增强。装载在380 nm芯片上的薄膜的发光效率从51.4 lm/W提高到135.37 lm/W。柔性 MAPbBr 3 /RTV-2 薄膜在 X 射线照射下响应灵敏。其检测限低至12 nGy air s -1 ，比X射线诊断中的常规剂量（5.5 μGy s -1 ）低400倍。这些结果为设计具有明亮发光和出色灵活性的钙钛矿器件提供了指导，从而使可穿戴 X 射线探测器能够用于剂量监测。
• Hydrophobic RTV-2 polymer is screened out for encapsulation of MAPbBr 3 . • MAPbBr 3 /RTV-2 film achieves a remarkable water-assistant fluorescence enhancement. • Mechanism of the water induced fluorescence enhancement is elucidated. • The film has great potential in flexible X-Ray scintillator for dose monitoring. Methylammonium lead halide perovskites are well-known having a poor stability towards moisture. Water causes degradation of ionic perovskites and weaken the optical and electronic performance of perovskite-based devices. Main strategies to improve moisture stability are compositional engineering, surface engineering and matrix encapsulation. Herein, encapsulation strategy is implemented through screening a polymer matrix, a hydrophobic room-temperature vulcanized silicone rubber (RTV-2). Owing to the positive effect of moderate water on the performance of perovskites, the obtained MAPbBr 3 /RTV-2 composite film is processed with water post-treatment to undergo surface engineering. The composite film achieves a remarkable 8-fold fluorescence enhancement. Luminous efficiency of the film loaded on a 380 nm chip is improved from 51.4 lm/W to 135.37 lm/W. The flexible MAPbBr 3 /RTV-2 film responds sensitively under X-ray irradiation. Its detection limit is down to 12 nGy air s -1 , 400 times lower than the regular dosage in X-ray diagnostics (5.5 μGy s -1 ). These results provide guidance to design perovskite-based devices with bright luminescence and excellent flexibility to qualify the wearable X-ray detectors for dose monitoring.