Identifying self-trapped excitons in 2D perovskites by Raman spectroscopy [Invited]

• 作者: Junze Li Junchao Hu Jiaqi Ma Xinglin Wen Dehui Li
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2021,（10）
• 所属期刊栏目: Spectroscopy
• 页码范围: 93-96
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL202119.103001

摘要

Two-dimensional[2D]perovskites exhibit broadband emission due to strong exciton-phonon coupling-induced self-trapped excitons and thus would find important applications in the field of white-light emitting devices.However,the available identifying methods for self-trapped excitons are currently rather limited and complex.Here,we identify the existence of self-trapped excitons by Raman spectroscopy in both excited and non-excited states.Under excited states,the shifting of the Raman peak indicates the presence of the lattice distortion,which together with the extra Ramen scattering peak reveals the presence of self-trapped excitons.Our work provides an alternative simple method to study self-trapped excitons in 2D perovskites.