In recent years, halide perovskite materials have made significant progress in optically pumped lasing. Among many reported perovskites, 1-naphthylmethylamine (NMA)-based quasi-two-dimensional (quasi-2D) perovskite films are promising as a gain medium for low-threshold optical lasing. However, their optical laser thresholds are still high for the realization of electrically pumped lasing. To explore the possibility of reducing the thresholds, we investigate temperature-dependent laser characteristics of NMA-based quasi-2D perovskite films fabricated on top of a circularly shaped distributed feedback resonator. Although the laser threshold of these films is already low (∼2 μJ cm^–2) at room temperature (298 K), their threshold is further reduced by ∼1/200 to ∼0.01 μJ cm^–2 as the film temperatures go down to 73 K. From the optical threshold at 73 K, the threshold current density required for the electrical lasing is estimated at a very low value of ∼3.4 A cm^–2. However, the optical laser threshold and estimated current threshold are, respectively, increased to ∼6 μJ cm^–2 and ∼2.04 kA cm^–2 because of the presence of an optical loss in actual devices with a metal electrode. Therefore, future optimization of device architectures to reduce the optical loss is crucial to realizing the electrical lasing.

中文翻译：

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1-萘基甲胺基准二维钙钛矿薄膜在较低温度下改善光致发光、电致发光和激光特性


近年来，卤化物钙钛矿材料在光泵浦激光方面取得了重大进展。在许多报道的钙钛矿中，1-萘甲胺（NMA）基准二维（准2D）钙钛矿薄膜有望作为低阈值光学激光的增益介质。然而，它们的光学激光阈值对于实现电泵浦激光仍然很高。为了探索降低阈值的可能性，我们研究了在圆形分布反馈谐振器顶部制造的基于 NMA 的准二维钙钛矿薄膜的温度依赖性激光特性。尽管这些薄膜在室温（298 K）下的激光阈值已经很低（∼2 μJ cm ^–2 ），但它们的阈值进一步降低了∼1/200至∼0.01 μJ cm ^–2 。然而，由于实际器件中存在光学损耗，光学激光阈值和估计电流阈值分别增加至~6 μJ cm ^–2 和~2.04 kA cm ^–2 用金属电极。因此，未来优化器件架构以减少光损耗对于实现电激光至关重要。