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Perovskite thin-film laser diodes have emerged as promising candidates for on-chip laser sources. However, although optical pumping laser technology has been successfully demonstrated, the realization of electrically pumped perovskite lasers remains highly challenging. In this study, we investigated the optical gain mechanism in polycrystalline perovskite thin films by mapping the spatial distribution of amplified spontaneous emission in the heterostructured films and its spatial correlation with local electronic properties. We found that the optical gain in these polycrystalline perovskite films mainly occurs at defect sites, although the photoluminescence efficiency is relatively low, they exhibit high optical gain efficiency and lower photonic carrier lifetime. Our findings highlight the importance of defects in the development of electrically pumped laser diodes. This research was published in the journal Advanced Materials under the title "The Impact of Nano-Scale Defects on the Macroscopic Amplified Spontaneous Emission in Polycrystalline Perovskite Thin-Films".
References:
DOI: 10.1002/adma.202516903
