Light Technology Institute, Karlsruhe Institute of Technology, Kaiserstraße 12, 76131, Karlsruhe, Germany.
Department of Physical Electronics, Tel-Aviv University, Ramat-Aviv, 6997, Tel-Aviv, Israel.
Nat Commun. 2019 Feb 28;10(1):988. doi: 10.1038/s41467-019-08929-0.
Sustained stimulated emission under continuous-wave (CW) excitation is a prerequisite for new semiconductor materials being developed for laser gain media. Although hybrid organic-inorganic lead-halide perovskites have attracted much attention as optical gain media, the demonstration of room-temperature CW lasing has still not been realized. Here, we present a critical step towards this goal by demonstrating CW amplified spontaneous emission (ASE) in a phase-stable perovskite at temperatures up to 120 K. The phase-stable perovskite maintains its room-temperature phase while undergoing cryogenic cooling and can potentially support CW lasing also at higher temperatures. We find the threshold level for CW ASE to be 387 W cm at 80 K. These results indicate that easily-fabricated single-phase perovskite thin films can sustain CW stimulated emission, potential at higher temperatures as well, by further optimization of the material quality in order to extend the carrier lifetimes.
连续波 (CW) 激发下的持续受激辐射是开发用于激光增益介质的新型半导体材料的前提。尽管混合有机-无机卤化铅钙钛矿作为光学增益介质引起了广泛关注，但室温 CW 激光的演示仍未实现。在这里，我们通过在温度高达 120K 的稳定相钙钛矿中演示 CW 放大自发辐射 (ASE) 来实现这一目标的关键一步。稳定相钙钛矿在经历低温冷却时保持其室温相，并且在更高温度下也有可能支持 CW 激光。我们发现 CW ASE 的阈值水平在 80K 时为 387W/cm。这些结果表明，通过进一步优化材料质量以延长载流子寿命，易于制造的单相钙钛矿薄膜可以在更高温度下维持 CW 受激辐射，具有潜在应用前景。
