title: Colloidal CsPbBr3 Perovskite Nanocrystals: Luminescence beyond Traditional Quantum Dots.
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.
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008 (India).
authors.forename: Abhishek
authors.initials: A
authors.lastname: Swarnkar
authors.affiliation: Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076 (India).
authors.forename: Ramya
authors.initials: R
authors.lastname: Chulliyil
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008 (India).
authors.forename: Vikash Kumar
authors.initials: VK
authors.lastname: Ravi
authors.affiliation: Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076 (India).
authors.forename: Mir
authors.initials: M
authors.lastname: Irfanullah
authors.affiliation: Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076 (India).
authors.forename: Arindam
authors.initials: A
authors.lastname: Chowdhury
authors.affiliation: Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008 (India). angshuman@iiserpune.ac.in.
authors.forename: Angshuman
authors.initials: A
authors.lastname: Nag
keywords: CsPbBr3; blinking; colloidal quantum dots; luminescence; nanocrystals; perovskites