Affiliation:
1. Anhui Provincial Engineering Research Center of Semiconductor Inspection Technology and Instrument, Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Opto‐electronics Engineering Hefei University of Technology Hefei 230009 China
2. School of Chemistry and Chemical Engineering Hefei University of Technology Hefei 230009 China
Abstract
Dion–Jacobson (DJ)‐phase perovskites have received attention in the field of amplified spontaneous emission (ASE) and lasers due to their excellent structural stability and charge‐transfer performance. However, the effect of the diamine cation size on the ASE properties of DJ‐phase perovskite has not been studied. Herein, the effect is systematically studied and in the results it is shown that tuning the size of the diamine cation can inhibit the formation of the small‐n phases, reduce the surface roughness, and passivate defects of DJ‐phase perovskite films. Based on those, the low‐threshold ASE (61 μJ cm−2 under nanosecond laser excitation) of the 1,3‐propylenediamine‐cation‐based DJ‐phase perovskite films is realized. Additionally, the film exhibits excellent photostability. The ASE intensity remains at 90% of the original value after a pulsed laser irradiation of 3000 μJ cm−2 for 120 min. In this work, a strategy is provided to realize high‐performance DJ‐phase perovskite ASE and lasers.
Funder
National Natural Science Foundation of China
Science Fund for Distinguished Young Scholars of Anhui Province