双钙钛矿荧光粉中陷阱深度的宽范围调谐,使可调谐的近红外持续发光

Rujun Yang , Kunjie Song , Yuantian Zheng , Chenhan Zhan , Yajing Wang , Cunjian Lin , Tianliang Zhou , Yixi Zhuang , Rongjun Xie
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引用次数: 0

摘要

持久发光(PersL)材料利用陷阱储存能量并长时间发射光子,在光学信息存储、安全标签和生物成像等领域得到了重要应用。陷阱深度是决定这些材料性能的关键因素;然而,实现高精度所需的陷阱深度仍然是一个巨大的挑战。在这里,我们提供了具有高度兼容晶体结构的双钙钛矿荧光粉(Cs2SnCl6-Cs2ZrCl6-Cs2HfCl6系列),在0.11-1.25 eV的超宽范围内实现了陷阱深度的连续和精确调谐。通过加入W4+作为发光中心,这些荧光粉在约900 nm处表现出出色的近红外(NIR) PersL性能,持续发射时间超过10小时。阐明了PersL的潜在机制,并将陷阱深度的大范围可调性归因于带隙工程在整个材料系统中的普遍适用性。此外,我们通过设计一个柔性x射线成像探测器板来演示这些材料的实际应用。检测板的存储时间超过1周,近红外区检测限为0.83 μGyair·s−1,实时成像分辨率为14.2 lp·mm−1,延迟成像分辨率为2.5 lp·mm−1。这些特征显示了x射线发光扩展成像的强大潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Wide-range tuning of trap depths in double perovskite phosphors enabling tunable NIR persistent luminescence

Wide-range tuning of trap depths in double perovskite phosphors enabling tunable NIR persistent luminescence
Persistent Luminescence (PersL) materials, which use traps to store energy and emit photons over a long period, have found important applications in the fields of optical information storage, security labeling, and biological imaging. The trap depth is a crucial factor determining the performance of these materials; however, achieving the desired trap depth with high precision remains a great challenge. Here, we provide double perovskite phosphors (Cs2SnCl6-Cs2ZrCl6-Cs2HfCl6 series) with highly compatible crystal structures, enabling continuous and precise tuning of trap depth over an ultra-wide range of 0.11–1.25 ​eV. By incorporating W4+ as the luminescent centers, these phosphors exhibit outstanding near-infrared (NIR) PersL performance at approximately 900 ​nm and a lasting emission duration exceeding 10 ​h. The underlying mechanism of PersL is elucidated, and the wide-range tunability of trap depth is attributed to the universal applicability of band-gap engineering in the entire material system. Furthermore, we demonstrate the practical application of these materials by designing a flexible detector plate for X-ray imaging. The detector plate exhibits a storage time of more than 1 week, a detection limit of 0.83 μGyair·s−1 in the near-infrared region, and real-time and delay-time imaging resolutions of 14.2 lp·mm−1 and 2.5 lp·mm−1, respectively. These attributes demonstrate strong potential for X-ray luminescence extension imaging.
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CiteScore
33.30
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