绿色溶剂工程调控相分布实现低阈值准二维钙钛矿激光器OA

Quasi-two-dimensional(quasi-2d)perovskites are promising gain media for micro-nano lasers,yet their uncontrolled crystallization and abundant low-n phases often hinder optical gain and device performance.In this work,we introduce ethyl acetate(EA)as a green antisolvent to fabricate high-quality quasi-2D PEA0.4MAPbBr3 films.The EA-treated films exhibit superior morphology,enhanced crystallinity,and notably inhibited low n-phas-es.These improvements yield a prolonged photoluminescence lifetime of 26.3 ns and a substantially extended gain lifetime of 129 ps.Consequently,the optimized film exhibits a markedly reduced amplified spontaneous emission(ASE)threshold of 5.6 μJ·cm-2 and a high net modal gain of 935 cm-1.Leveraging these enhanced gain properties,we successfully demonstrate a vertical-cavity surface-emitting laser(VCSEL)based on a dielectric Bragg reflector microcavity,which delivers single-mode lasing at 528.3 nm and a high quality factor of～5 886.This work presents a green-solvent-engineering strategy for high-performance perovskite lasers,advancing their prospects for scalable pho-tonic integration.