Journal
ADVANCED OPTICAL MATERIALS
Volume 6, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201700997
Keywords
amplified spontaneous emission; perovskites; quantum dots; SiO2; two-photon excitation
Categories
Funding
- New Cross-Disciplinary Science Project [106112017CDJQJ128837]
- National Natural Science Foundation of China [61475169, 61674023, 61521093, 11127901, 61520106012, 61635004]
- Fundamental Research Funds for the Central Universities [106112017CDJQJ128837]
- Chinese Academy of Sciences (CAS)
- CAS [XDB1603]
- International S&T Cooperation Program of China [2016YFE0119300]
- Chongqing Scientific & Technological Talents Program [KJXX2017003]
- Open Fund of the State Key Laboratory of High Field Laser Physics (Shanghai Institute of Optics and Fine Mechanics)
- Key Research and Development Project of the Ministry of Science and Technology [2016YFC0801200]
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Perovskites have emerged as a class of cutting-edge photovoltaic and light-emitting materials. However, poor stability due to high moisture sensitivity and undesirable blinking severely limits their further application. Here, to solve these problems without destroying optoelectronic performance, a simple process for the fabrication of nonblinking CsPbBr3 quantum dots (QDs) is investigated. By embedding CsPbBr3 QDs into waterless silica spheres, the blinking of QDs can be strikingly suppressed, with an effective improvement of the moisture resistance and enhanced photostability. The silica sphere can also prevent anion exchange of different halide elements between perovskite QDs. Ultrastable amplified spontaneous emission (ASE) from QDs/SiO2 with no degradation for at least 12 h is observed under continuous laser irradiation (4 x 10(7) continuous intense laser shots), with almost no ASE degradation evident after 60 d of storage under ambient conditions. Most notably, the ASE threshold (P-th) of CsPbBr3 QDs is decreased by 50% and the relative efficiency increased by 388%. The perovskite QDs coated by the waterless SiO2 shell provide a novel platform for realizing perovskite nanomaterials with improved operational stability, nonblinking properties, and enhanced emission all at the same time, which is especially attractive for photovoltaic and light-emitting device applications.
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