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- Title
Low-temperature solution-processed wavelength-tunable perovskites for lasing.
- Authors
Guichuan Xing; Xinfeng Liu; Tze Chien Sum; Swee Sien Lim; Yantara, Natalia; Sabba, Dharani; Mhaisalkar, Subodh; Mathews, Nripan; Grätzel, Michael
- Abstract
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 lasing1-4 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 dots5-7 still remain. Herein, we reveal that solution-processed organic-inorganic halide perovskites (CH3NH3PbX3 where X = Cl, Br, I), which demonstrated huge potential in photovoltaics8-11, also have promising optical gain. Their ultra-stable amplified spontaneous emission at strikingly low thresholds stems from their large absorption coefficients, 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 characteristics8, these materials may show electrically driven lasing.
- Subjects
PEROVSKITE spectra; PHOTOVOLTAIC power generation; PHOTON emission; PHOTOLUMINESCENCE; ABSORPTION coefficients; ACTIVE medium
- Publication
Nature Materials, 2014, Vol 13, Issue 5, p476
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/NMAT3911