Colloidal CsPbBr3 Perovskite Nanocrystals: Luminescence beyond Traditional Quantum Dots |
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Authors: | Abhishek Swarnkar Ramya Chulliyil Vikash Kumar Ravi Dr Mir Irfanullah Dr Arindam Chowdhury Dr Angshuman Nag |
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Institution: | 1. Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008 (India);2. Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076 (India) |
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Abstract: | 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 Förster resonance energy transfer, along with batch‐to‐batch reproducibility of NCs exhibiting PL peaks within ±1 nm. Also, PL peak positions do not alter with measurement temperature in the range of 25 to 100 °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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Keywords: | blinking colloidal quantum dots CsPbBr3 luminescence nanocrystals perovskites |
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