Surface Coating of Lead-free Perovskites to Break the Luminescence Threshold for Fluorescent Information Recognition

发光 材料科学 荧光粉 荧光 钙钛矿(结构) 光电子学 涂层 兴奋剂 猝灭(荧光) 纳米技术 光学 化学 结晶学 物理
作者
Hongbo Zhao,Ru Chen,Xiaoyan Li,Lifan Shen,Edwin Yue Bun Pun,Hai Lin
出处
期刊:ACS Sustainable Chemistry & Engineering [American Chemical Society]
卷期号:11 (28): 10534-10544 被引量:5
标识
DOI:10.1021/acssuschemeng.3c02327
摘要

Lead-free perovskites are becoming a promising candidate in the new generation of fluorescence information recognition owing to their superior optoelectronic properties and stable chemical properties. However, the vast majority of perovskite phosphors present a luminescence threshold (LT) due to concentration quenching and exhibit a single luminescent peak as the monochrome source, leading to limited application prospects. Herein, surface coating of Bi3+-doped all-inorganic lead-free Cs2ZrCl6 perovskite microcrystal is designed to break LT and present dual-mode luminescence under 259 and 358 nm excitation. Dual-mode fluorescence peaks are located at 435 and 453 nm, contrary to self-trapped exciton (STE) emissions reported previously, which originate from STE emission and inter-configurational 3P0,1 → 1S0 transitions of Bi3+, respectively. Moreover, surface coating of ethyl orthosilicate (CHSiO) is introduced to form a core–shell structure, enhancing the particle dispersion and the luminescence stability of Cs2ZrCl6:Bi3+ phosphors, which breaks the LT to increase luminescence intensity. Finally, the Cs2ZrCl6:Bi3+-coated CHSiO is mixed with polydimethylsiloxane and printed QR code by screen printing technology to achieve dual-mode luminescence and display. These findings reveal the unique advantages of surface-coated Bi3+-doped Cs2ZrCl6 perovskites, thus opening a new pathway for multi-mode fluorescence recognition and remote excitation applications.
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