期刊
NANO LETTERS
卷 21, 期 18, 页码 7831-7838出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02880
关键词
Perovskite semiconductors; optical gain; charged exciton; electrical switching; ultrafast spectroscopy
类别
资金
- National Key R&D Program of China [2018YFA0209101, 2017YFA0303700]
- National Science Foundation of China [21922302, 21873047, 11904168, 91833305, 91850105]
- Fundamental Research Funds for the Central University
Charging nanocrystals with current injection can lift the level degeneracy and generate charged exciton gain with significantly lower excitation density. Electrical switching of amplified spontaneous emission in CsPbBr3 nanocrystal films achieved over 50% threshold reduction due to charged excitons. Our work provides an effective approach to electrically modulated optical gain in colloidal perovskite nanocrystals for advanced laser and information technology applications.
Perovskite semiconductor nanocrystals are promising for optical amplification and laser applications benefiting from efficient optical gain generation. Nevertheless, the pump threshold is limited by more than one exciton per nanocrystal required to generate population inversion in neutral nanocrystals due to the level degeneracy. Here, we show that by charging nanocrystals with current injection, the level degeneracy can be lifted to generate charged exciton gain with markedly low excitation density. On the basis of the scenario, we have demonstrated electrical switching of amplified spontaneous emission in films of CsPbBr3 nanocrystals sandwiched by two electrodes with over 50% threshold reduction owing to charged excitons. Our work provides an effective approach to electrically modulated optical gain in colloidal perovskite nanocrystals for potential applications in advanced laser and information technology.
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