Temperature-dependent time-resolved photoluminescence of (C₆H₅C₂H₄NH₃)₂PbX₄ (X = Br and I)

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• 作者：Nobuaki Kitazawa ; ^{nkita@nda.ac.jp} ; Masami Aono ; Yoshihisa Watanabe
• 关键词：Excitons ; Time-resolved photoluminescence ; Luminescence ; Thin films ; Optical properties
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：15 June, 2012
• 卷：134
• 期：2-3
• 页码：875-880
• 文件大小：887 K

摘要

This paper describes temperature-dependent time-resolved photoluminescence of two-dimensional organic-inorganic layered perovskite compounds, (C₆H₅C₂H₄NH₃)₂PbX₄ (X = Br and I) prepared by solution-based self-assembly. (C₆H₅C₂H₄NH₃)₂PbX₄ shows fluorescence from free-exciton even at room temperature. At low temperatures below 90 K, the Stokes-shifted fluorescence from bound excitons appears in (C₆H₅C₂H₄NH₃)₂PbI₄. In contrast, (C₆H₅C₂H₄NH₃)₂PbBr₄ exhibits Stokes-shifted phosphorescence from the triplet excited state to the ground state. The local structure between the organic and inorganic layers plays a prominent role in the formation of triplet excitons.