Improved Photoluminescence, Electroluminescence, and Laser Characteristics of 1‑Naphthylmethylamine-Based Quasi-Two-Dimensional Perovskite Films at Lower Temperatures

• Published in: Journal of physical chemistry. C 2024-07, Vol.128 (26), p.10974-10981
• Main Authors: Nasu, Ryotaro, Tang, Xun, Senevirathne, Adikari Mudiyanselage Chathuranganie, Matsushima, Toshinori, Adachi, Chihaya
• Format: Article
• Language: English
• Subjects: C: Physical Properties of Materials and Interfaces
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/acs.jpcc.4c01763

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.