Journal
NATURE MATERIALS
Volume 13, Issue 5, Pages 476-480Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3911
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Funding
- NTU [M4080514, M4081293]
- SPMS collaborative Research Award [M4080536]
- Ministry of Education AcRF Tier 2 grant [MOE2013-T2-1-081]
- Singapore NRF through the Competitive Research Program [NRF-CRP4-2008-03]
- Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE) CREATE Programme
- European Research Council [ARG 247404]
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Low-temperature solution-processed materials that show optical gain and can be embedded into a wide range of cavity resonators are attractive for the realization of on-chip coherent light sources. Organic semiconductors and colloidal quantum dots are considered the main candidates for this application. However, stumbling blocks in organic lasing(1-4) include intrinsic losses from bimolecular annihilation and the conflicting requirements of high charge carrier mobility and large stimulated emission; whereas challenges pertaining to Auger losses and charge transport in quantum dots(5-7) still remain. Herein, we reveal that solution-processed organic-inorganic halide perovskites (CH3NH3PbX3 where X = Cl, Br, I), which demonstrated huge potential in photovoltaics(8-11), also have promising optical gain. Their ultra-stable amplified spontaneous emission at strikingly low thresholds stems from their large absorption coeffcients, ultralow bulk defect densities and slow Auger recombination. Straightforward visible spectral tunability (390-790 nm) is demonstrated. Importantly, in view of their balanced ambipolar charge transport characteristics(8), these materials may show electrically driven lasing.
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