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Novel Cryogenic Dual-Emission Mechanism Of Lead-Free Double Perovskite Cs2AgInCl6 and Using SiO2 To Enhance their Photoluminescence And Photostability
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2020-09-18 , DOI: 10.1016/j.jhazmat.2020.123821
Xiao-Kai Gong , Xiao-Song Zhang , Xin Liu , Ru-Kun Ding , Jia-Jia Zhang , Hao Yin , Zhao-Wei Zhang , Lan Li , Jian-Ping Xu

Lead halide perovskite have attracted world-wide attention regarding their serious hazards on ecological environment and human health. To improve both the emission intensity and stability of Cs2AgInCl6, this study explores using SiO2 to structurally adjust Cs2AgInCl6. Note that including SiO2 changed the growth style and crystal morphology of Cs2AgInCl6 from an octahedron to a truncated octahedron. After structural adjustment, the unit cells scattered, and the absorption limit broke. Moreover, SiO2 was demonstrated to passivate the material’s surface to form an anti-oxidation protective layer. Consequently, the photoluminescence emission intensity increased by 181.5% and the stability of Cs2AgInCl6 improved by 83.11%. This work provides a methodology and reference for future improvements to the luminescence of Cs2AgInCl6. Furthermore, a novel double-emission phenomenon (λex = 365 nm: λem ≈ 580 nm; λex = 325 nm: λem ≈ 505 nm) of Cs2AgInCl6 at cryogenic temperatures (20 K) was discovered; this phenomenon explains the shoulder emission problem of 400–450 nm at room temperature and clarifies the luminescence mechanism of Cs2AgInCl6.



中文翻译:

新型无铅双钙钛矿Cs 2 AgInCl 6的低温双发射机理并利用SiO 2增强其光致发光和光稳定性

钙钛矿卤化物铅对生态环境和人类健康的严重危害引起了全世界的关注。为了提高Cs 2 AgInCl 6的发射强度和稳定性,本研究探索使用SiO 2在结构上调节Cs 2 AgInCl 6。注意,包含SiO 2改变了Cs 2 AgInCl 6的生长方式和晶体形态从八面体变为截短的八面体。结构调整后,晶胞分散,吸收极限破裂。此外,SiO 2被证明可以钝化材料表面以形成抗氧化保护层。因此,光致发光发射强度增加了181.5%,Cs 2 AgInCl 6的稳定性提高了83.11%。这项工作为将来改进Cs 2 AgInCl 6的发光提供了一种方法学和参考。此外,一个新的双发射现象(λ EX = 365nm的:λ EM ≈580纳米; λ EX = 325nm的:λ EM ≈505纳米)的Cs 2 AgInCl 6在低温(20 K)下被发现;这种现象解释了室温下400-450 nm的肩峰发射问题,并阐明了Cs 2 AgInCl 6的发光机理。

更新日期:2020-09-20
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