Tian Kun, Lu Yannan, Liu Ruqing, Loh Xian Jun, Young David James
Jiuquan Vocational Technical College, Jiuquan, 735000, P. R. China.
College of Engineering, Information Technology and Environment, Charles Darwin University, Northern Territory, 0909, Australia.
Chempluschem. 2021 Nov;86(11):1537-1543. doi: 10.1002/cplu.202100377.
Organic additives can enhance the amplified spontaneous emission (ASE) performance of inorganic cesium lead halide perovskites (CsPbBr ) but volatility, potential hygroscopicity and oxidative degradation of these additives jeopardizes the thermal stability and shelf-life of blended CsPbBr films. To address this problem, we have fabricated perovskite films in a two-step solution protocol involving as little added polyethylene oxide (PEO) as possible. These films exhibited enhanced crystallization, improved photoluminescence (PL) intensity and prolonged lifetimes. Their hierarchical morphology and surface passivation lowered the ASE threshold from 278 to 176 μЈ/cm under one-photon nanosecond laser excitation. The proportion of added PEO was 0.3 wt% and was subsequently almost fully removed, thereby reducing its adverse influence on the stability of resulting films under continuous pulsed laser excitation. Stable ASE spectra could be stimulated after storage in air for 10 months.
有机添加剂可以增强无机铯铅卤化物钙钛矿（CsPbBr₃）的放大自发辐射（ASE）性能，但这些添加剂的挥发性、潜在吸湿性和氧化降解会危及混合CsPbBr₃薄膜的热稳定性和保质期。为了解决这个问题，我们采用两步溶液法制备了钙钛矿薄膜，其中添加的聚环氧乙烷（PEO）尽可能少。这些薄膜表现出增强的结晶、改善的光致发光（PL）强度和延长的寿命。它们的分级形态和表面钝化在单光子纳秒激光激发下将ASE阈值从278降低到176 μJ/cm²。添加的PEO比例为0.3 wt%，随后几乎被完全去除，从而降低了其在连续脉冲激光激发下对所得薄膜稳定性的不利影响。在空气中储存10个月后仍可激发稳定的ASE光谱。
