Lead halide perovskite is an attractive candidate for fabricating low-cost one-photon and two-photon-pumped lasers. However, the presence of vast trap sites and the leakage of electric fields limit the efficient amplified spontaneous emission (ASE) performances. Herein, we show that incorporating an insulating polymethylmethacrylate layer with a proper thickness onto perovskite films can play an important role in not only reducing both one-photon and two-photon ASE thresholds but also improving the light exposure stability remarkably. By means of spectroscopic investigation and optical simulation, the enhancement was ascribed to the trap passivation and electric field restraint and improved light outcoupling due to the dielectric confinement by the formation of symmetric waveguides structure. This work indicates the possibility of simple and effective approaches to realize efficient ASE and lasing.

中文翻译：

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通过绝缘聚合物涂层增强 CsPbBr3 薄膜的单光子和双光子放大自发发射

卤化铅钙钛矿是制造低成本单光子和双光子泵浦激光器的有吸引力的候选者。然而，巨大的陷阱位点的存在和电场的泄漏限制了有效的放大自发发射（ASE）性能。在此，我们表明在钙钛矿薄膜上加入适当厚度的绝缘聚甲基丙烯酸甲酯层不仅可以在降低单光子和双光子 ASE 阈值方面发挥重要作用，而且还可以显着提高曝光稳定性。通过光谱研究和光学模拟，增强归因于陷阱钝化和电场抑制以及由于形成对称波导结构的介电限制而改善的光输出耦合。