期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 51, 页码 15424-15428出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201508276
关键词
blinking; colloidal quantum dots; CsPbBr3; luminescence; nanocrystals; perovskites
资金
- Science and Engineering Research Board (SERB) Govt. of India [SR/S2/RJN-61/2012]
- IRCC
- IIT Bombay
- MNRE (Govt. of India)
- UGC
Traditional CdSe-based colloidal quantum dots (cQDs) have interesting photoluminescence (PL) properties. Herein we highlight the advantages in both ensemble and single-nanocrystal PL of colloidal CsPbBr3 nanocrystals (NCs) over the traditional cQDs. An ensemble of colloidal CsPbBr3 NCs (11 nm) exhibits ca. 90% PL quantum yield with narrow (FWHM=86 meV) spectral width. Interestingly, the spectral width of a single-NC and an ensemble are almost identical, ruling out the problem of size-distribution in PL broadening. Eliminating this problem leads to a negligible influence of self-absorption and Forster resonance energy transfer, along with batch-to-batch reproducibility of NCs exhibiting PL peaks within +/- 1 nm. Also, PLpeak positions do not alter with measurement temperature in the range of 25 to 100 degrees C. Importantly, CsPbBr3 NCs exhibit suppressed PL blinking with ca. 90% of the individual NCs remain mostly emissive (on-time > 85%), without much influence of excitation power.
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