期刊
ACS NANO
卷 11, 期 9, 页码 9294-9302出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b04683
关键词
lead-free perovskite; inorganic perovskite quantum dots; quantum yield; quantum-well band structure; photostability
类别
资金
- Major State Basic Research Development Program of China [2016YFB0700700]
- National Natural Science Foundation of Hubei Province [2016CFB431]
- Fundamental Research Funds for the Central Universities [HUST: 2016YXMS032]
Colloidal quantum dots (QDs) of lead halide perovskite have recently received great attention owing to their remarkable performances in optoelectronic applications. However, their wide applications are hindered from toxic lead element, which is not environment- and consumer-friendly. Herein, we utilized heterovalent substitution of divalent lead (Pb2+) with trivalent antimony (Sb3+) to synthesize stable and brightly luminescent Cs3Sb2Br9 QDs. The lead-free, full inorganic QDs were fabricated by a modified ligand-assisted reprecipitation strategy. A photoluminescence quantum yield (PLQY) was determined to be 46% at 410 nm, which was superior to that of other reported halide perovskite QDs. The PL enhancement mechanism was unraveled by surface composition derived quantum-well band structure and their large exciton binding energy. The Br-rich surface and the observed 530 meV exciton binding energy were proposed to guarantee the efficient radiative recombination. In addition, we can also tune the inorganic perovskite QD (Cs3Sb2X9) emission wavelength from 370 to 560 nm via anion exchange reactions. The developed full-inorganic lead-free Sbperovskite QDs with high PLQY and stable emission promise great potential for efficient emission candidates.
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