https://scholars.lib.ntu.edu.tw/handle/123456789/606924
標題: | Photoluminescence enhancement study in a Bi-doped Cs2AgInCl6double perovskite by pressure and temperature-dependent self-trapped exciton emission | 作者: | Dave K Huang W.-T Le?niewski T Lazarowska A Jankowski D Mahlik S Liu R.-S. RU-SHI LIU |
關鍵字: | Activation energy;Bismuth compounds;Chlorine compounds;Electronic structure;Indium compounds;Perovskite;Photoluminescence;Precipitation (chemical);X ray diffraction;Bi-doped;Double perovskites;Exciton emission;Exciton state;Free excitons;Photoluminescence enhancement;Pressure and temperature;Pressure dependent;Self trapped excitons;Temperature dependent;Excitons | 公開日期: | 2022 | 卷: | 51 | 期: | 5 | 起(迄)頁: | 2026-2032 | 來源出版物: | Dalton Transactions | 摘要: | Here, we report a halide precursor acid precipitation method to synthesize Cs2AgIn1-xBixCl6 (x = 0, 0.02, 0.04, 0.08, 0.16, 0.32, 0.64, and 1) microcrystals. Cs2AgInCl6 and Bi derivative double perovskites show broadband white light emission via self-trapped excitons (STEs) and have achieved the highest internal quantum efficiency of up to 52.4% at x = 0.08. Synchrotron X-ray diffraction confirmed the linear increase of lattice parameters and cell volume with Bi3+ substitution at In3+ sites. Absorbance, photocurrent excitation, and photoluminescence excitation spectra are used to observe possible transitions from the valence to the conduction band or free exciton (FE) states as well as transitions within local Bi3+ states. The broadband photoluminescence is quenched via a single nonradiative process with an activation energy ΔE = 1490 cm-1 for Cs2AgIn0.92Bi0.08Cl6. Under normal conditions, we observed STE emission, but applying external pressure alters the electronic structure such that at elevated pressure, the only emission via the FE state is observed. We anticipate that structure, temperature and pressure-dependent photoluminescence studies will help the future use of a single-source lead-free double perovskite for white light-emitting diode applications. ? The Royal Society of Chemistry. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85123969171&doi=10.1039%2fd1dt04047b&partnerID=40&md5=c2f89200eea86cee4ad98393839172d9 https://scholars.lib.ntu.edu.tw/handle/123456789/606924 |
ISSN: | 14779226 | DOI: | 10.1039/d1dt04047b |
顯示於: | 化學系 |
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