Abstract
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-2 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.
Highlights
Sustained stimulated emission under continuous-wave (CW) excitation is a prerequisite for new semiconductor materials being developed for laser gain media
The partial replacement of the MA cation results in an identical crystal phase for arbitrary iodine bromine ratios at room temperature
No phase transitions are known at lower temperatures[33,34], or have been observed in the current work
Summary
Sustained stimulated emission under continuous-wave (CW) excitation is a prerequisite for new semiconductor materials being developed for laser gain media. Results Temperature-dependent amplified spontaneous emission (ASE) under pulsed excitation. The film was mounted inside a cryostat (Janis STVP100, see Supplementary Figure 2 for a schematic of the experimental setup) allowing the intensity-dependence of the emission spectrum to be measured as a function of temperature.
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