期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 8, 期 17, 页码 5847-5855出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc00198h
关键词
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资金
- National Key R&D Program of China [2018YFC0910602]
- National Natural Science Foundation of China [61775145/61525503/61620106016/61835009/81727804]
- (Key) Project of Department of Education of Guangdong Province [2015KGJHZ002/2016KCXTD007]
- Guangdong Natural Science Foundation Innovation Team [2014A030312008]
- Shenzhen Basic Research Project [JCYJ20170412110212234/JCYJ20160328144746940/JCYJ20170412105003520]
Colloidal perovskite quantum dots are candidate materials for solution-processable lasers, although stimulated emission in a semiconductor usually occurs in the multiexciton regime. Due to the quantum-confinement effect of semiconductor quantum dots, the non-radiative recombination transition dominates the relaxation of multiexcitons. Hence, the implementation of low-threshold stimulated emission of perovskite quantum dots in the single-exciton regime is meaningful. Herein, we show that this problem can be partially solved by employing a locally enhanced electric field. By applying the metal surface plasmon resonance energy-transfer effect, we demonstrate a considerable reduction of the optical gain threshold due to the newly generated coupling level induced by the local surface plasmon, and obtain optical gain in the single-exciton regime at room temperature in colloidal perovskite quantum dots. At the same time, we achieve a more than fourfold reduction in the amplified spontaneous emission threshold. This may provide a new concept for the further design of low-threshold stimulated emission colloidal nanocrystal lasers and even for improving their energy conversion efficiency.
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