報告題目：高壓調控雜化鈣钛礦的電子和光學特性研究（Engineering Electro and Optical Properties of hybrid Perovskites with High Pressure）

 報告人：申泽骧 南洋理工大学

報告時間：6月17日（周五）10：00

 報告所在：線上騰訊會議（騰訊會議號：969-404-693）

 摘要：

 Hybrid perovskites are a new class of functional materials with potential applications in various technologically important areas, such as solar cells, LED and lasing. Compared with their 3D counterparts, 2D perovskites exhibit special properties, e.g. their natural quantum-well structure yields stable excitons, able to interact more strongly with phonons, spins and defects. Layered perovskites are also more structurally stable. High pressure induces a rich variety of phenomena in the electronic and optical properties in the hybrid Perovskite materials, including enhancement of photoluminescence (PL) by at least two orders of magnitude, narrow to white light emission, rich PL energy and lifetime changes. The optical properties of 2D perovskites are mainly governed by excitons, and the investigation of intrinsic and extrinsic, radiative and nonradiative exciton recombination pathways is essential. The intrinsic pathways are related to exciton-phonon interactions. Lattice vibrations create spatial and temporal potential fluctuations, where the first one causes scattering of excitons and broadening of excitonic peaks in optical spectroscopy, while the second leads to the fine structure of the spectra, known as Frank-Condon shape. Besides, a moving exciton is able to create vibrations around it, inducing lattice distortions.

 個人簡曆：

  申泽骧，新加坡南洋理工大学（NTU）数理学院教授，质料科学与工程学院教授，先进光子学技术中心主任，全球高被引科学家，荣获莫斯科国立大学荣誉教授，新加坡新移民杰出孝敬奖，新加坡物理学会卓越研究金奖；新加坡南洋理工大学研究及创新奖，伦敦大学国王学院卓越博士论文奖，王宽成奖学金，英国卓越外洋留学生奖学金。申泽骧教授现任研究生院副院长，卖力NTU跨学科研究生院，曾担任南洋理工大学董事会照料、新加坡物理学会理事、新加坡质料学会理事、国际物理奥委会成员、新加坡奥林匹克物理竞赛主席，及新加坡-中国科学技术交流促进协会会长。