中国科学院福建物构所陈学元团队报道了钙钛矿衍生物Cs2SnCl6微晶中Bi³⁺/Te⁴⁺发射体的双频可调谐白光发射。相关研究成果于2022年1月4日发表在《德国应用化学》。

发光金属卤化物由于其优越的光学性能和易于溶液加工而在下一代固态照明中引起了广泛关注。

该文中，研究人员报道了一种基于Bi³⁺/Te⁴⁺共掺杂钙钛矿衍生物Cs2SnCl6微晶的新型高效双波段可调谐白光发射器。由于Bi³⁺与Te⁴⁺之间的强电子-声子耦合和高效的能量转移，微晶显示出源自Bi³⁺和Te⁴⁺组态间3P0,1→1S0的宽双频白光发射，其跃迁具有良好的稳定性和高的光致发光（PL）量子产率，最高可达68.3%。特别地，观察到Bi³⁺-PL寿命从10 K时的毫秒到300 K时的微秒发生了显著的转变，这是孤立Bi³⁺发射的坚实证据。

该发现不仅为Cs2SnCl6中Bi³⁺和Te⁴⁺的激发态动力学提供了新的见解，而且为通过ns2-金属离子共掺杂实现基于无铅金属卤化物的单组分白光发射器提供了一种通用方法。

附：英文原文

Title: Dual-Band-Tunable White-Light Emission from Bi3+/Te4+ Emitters in Perovskite-Derivative Cs2SnCl6 Microcrystals

Author: Wei Zhang, Wei Zheng, Lingyun Li, Ping Huang, Zhongliang Gong, Ziwei Zhou, Jinyue Sun, Yan Yu, Xueyuan Chen

Issue&Volume: 2022-01-04

Abstract: Luminescent metal halides have attracted considerable attention in next-generation solid-state lighting because of their superior optical properties and easy solution processibility. Herein, we report a new class of highly efficient and dual-band tunable white-light emitters based on Bi3+/Te4+ co-doped perovskite derivative Cs2SnCl6 microcrystals. Owing to the strong electronphonon coupling and efficient energy transfer from Bi3+ to Te4+, the microcrystals exhibited broad dual-band white-light emission originating from the inter-configurational 3P0,1 → 1S0 transitions of Bi3+ and Te4+, with good stability and a high photoluminescence (PL) quantum yield up to 68.3%. Specifically, a remarkable transition in Bi3+-PL lifetime from milliseconds at 10 K to microseconds at 300 K was observed, as a solid evidence for the isolated Bi3+ emission. These findings provide not only new insights into the excited-state dynamics of Bi3+ and Te4+ in Cs2SnCl6, but also a general approach to achieve single-composition white-light emitters based on lead-free metal halides through ns2-metal ion co-doping.

DOI: 10.1002/anie.202116085

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202116085