Multicolor luminescence and afterglow from Cs2NaScCl6:Sb3+,Mn2+ crystals†

IF 6.1 1区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Xiaojia Wang, Wei Zheng, Xiangzhou Zhang, Xiangxiang Chen and Yuhai Zhang
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Abstract

In contrast to single-band emitting phosphors, dual-band emitting phosphors provide a versatile tool for ratio-metric color tuning, enabling a wide color gamut and ensuing applications in information encryption and the anti-counterfeiting area. Here, a double perovskite, Cs2NaScCl6:xMn2+ single crystals, was grown by a hydrothermal method. Pristine Cs2NaScCl6 crystals exhibited a pure blue emission band originating from the self-trapped excitons. Upon doping with Mn2+, the crystals exhibited a dual-band emission profile, consisting of both STE and Mn2+ emissions. To this end, the ratio of two bands was manipulated with Mn2+-doping concentration, rendering a wide color gamut from blue to red. Interestingly, co-doping with Sb3+ ions significantly enhanced the overall photoluminescence, boosting the quantum yield from 8.8% to up to 62.4%. Such an enhancement is attributed to an efficient energy transfer process from the STE to Mn2+ based on an investigation of photoluminescence lifetime. Importantly, these crystals exhibited an intriguing afterglow after X-ray excitation, with a duration exceeding 3000 s. This remarkable phenomenon opens up many new possibilities for their application in the advanced anti-counterfeiting area.

Abstract Image

来自 Cs2NaScCl6: Sb3+、Mn2+ 晶体的多色发光和余辉
与单波段发射荧光粉相比,双波段发射荧光粉为比色调节提供了一种多功能工具,可实现宽色域,从而应用于信息加密和防伪领域。在此,我们采用水热法制备了双过氧化物 Cs2NaScCl6: xMn2+ 单晶。原始的 Cs2NaScCl6 晶体显示出纯净的蓝色发射带,该发射带源于自俘获的激子。掺入 Mn2+ 后,晶体显示出由 STE 和 Mn2+ 发射组成的双波段发射曲线。为此,两个波段的比例可通过 Mn2+掺杂浓度进行调节,从而呈现出从蓝色到红色的广泛色域。有趣的是,Sb3+ 离子的共掺杂显著增强了整体光致发光,将量子产率从 8.8% 提高到 62.4%。根据对光致发光寿命的研究,这种增强可归因于从 STE 到 Mn2+ 的高效能量转移过程。重要的是,这些晶体在 X 射线激发后表现出迷人的余辉,持续时间超过 3000 秒。
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来源期刊
Inorganic Chemistry Frontiers
Inorganic Chemistry Frontiers CHEMISTRY, INORGANIC & NUCLEAR-
CiteScore
10.40
自引率
7.10%
发文量
587
审稿时长
1.2 months
期刊介绍: The international, high quality journal for interdisciplinary research between inorganic chemistry and related subjects
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