Synergistically Enhanced Amplified Spontaneous Emission by Cd Doping and Cl-Assisted Crystallization

作     者：Lu Zhang Jialun Wen Xiaodong Ren Shengye Jin Shengzhong Liu 

作者机构：Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China State Key Laboratory of Molecular Reaction Dynamics iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China University of the Chinese Academy of Sciences Beijing 100039 China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Normal University Xi'an 710119 China Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China 

出 版 物：《Advanced Optical Materials》 

年 卷 期：2020年第9卷第4期

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

主　　题：amplified spontaneous emission, ASE threshold CdCl2 perovskite films 

摘      要：Organic−inorganic hybrid halide perovskite materials have recently been recognized as a promising optical gain medium, and the development of optically pumped amplified spontaneous emission (ASE) of perovskite materials with low threshold and high optical gain will be on the only way to go for realizing its commercial perovskite laser. In this work, enhanced-performance ASE with lower threshold and higher optical gain is obtained in CdCl 2 passivated FA 0.9 MA 0.15 Cs 0.3 PbI 2.7 Br 0.3 (FAMACs) polycrystalline films coated with poly methyl methacrylate (PMMA) layer. The ASE threshold of the FAMACs polycrystalline films with CdCl 2 is significantly reduced from 18.7 to 7.9 µ J cm −2 , with an enhanced ASE output intensity and stability. The improved ASE performance can be attributed to the synergistic effect of Cd ion doping and Cl-ion-assisted crystallization in the FAMACs polycrystalline films, exhibiting remarkably enhanced photoluminescence, a prolonged decay lifetime and a low defect density, and thus leading to easily achieve the population inversion due to the reduction of nonradiative recombination of carriers in the optical gain medium.