Abstract：

Halide perovskites exhibit exceptional optoelectronic properties, including high tunability, high quantum yield, and scalable synthesis. Yet, their application in optoelectronic devices involves overcoming fundamental instability challenges while simultaneously unlocking novel photonic functionalities. My research advances these two frontiers: unraveling the microscopic origin of material instability and engineering advanced light-matter states for next-generation devices. First, I will discuss the mechanisms of phase segregation in mixed-halide perovskites. By combining in situ TEM with photoluminescence spectroscopy, we reveal that residual strain is a driving force behind phase instability. Shifting focus from material stability to device functionality, I will then present the realization of a chiral laser by integrating chiral 2D perovskites with DBR microcavities. We report room-temperature strong light-matter coupling with a Rabi splitting of 286 meV and demonstrate a room-temperature continuous-wave chiral exciton-polariton laser. This device exhibits a low threshold (0.5 W·cm⁻²) and a high degree of circular polarization (dissymmetry factor~0.30). Together, these studies offer strategies for stabilizing the perovskite lattice and establish a powerful platform for lowenergy spin-optoelectronic applications.

主讲人简介：

彭斯颖，西湖大学材料系助理教授。于2017年在加州理工学院获得物理学博士学位，之后在斯坦福大学 GLAM先进材料实验室从事博士后研究，2021年入职西湖大学。研究聚焦微纳光学与材料科学的交叉领 域，包括手性光学材料与器件、光操控材料的原位表征方法等。