Blue Circularly Polarized Luminescence from Quantum-Confined CsPbBr3 Nanocrystals with a Different Degree of Shape Anisotropy

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)8689–8697
Journal / PublicationThe Journal of Physical Chemistry C
Volume128
Issue number21
Online published15 May 2024
Publication statusPublished - 30 May 2024

Abstract

Circularly polarized luminescence is an attractive characteristic of chiral perovskite nanocrystals, as it opens possibilities for applications such as spin-polarized light-emitting diodes and chiral light-selective photodetectors. While previous research has mainly focused on green- and red-emitting chiral perovskite nanocrystals, the exploration of blue-emitting counterparts with efficient circularly polarized luminescence activity is still in its early stages. Here, we synthesize nanocubes, nanoribbons, and nanowires of CsPbBr3 perovskites, which exhibited strong blue emission thanks to quantum confinement in at least two dimensions. Their chiral induction is achieved by attaching chiral molecules (R/S-methylbenzylammonium bromide) to the surface of nanocrystals, resulting in circular dichroism and circularly polarized luminescence. Upon attachment of chiral ligands, the average absorption dissymmetry factor, |gabs|, reached 9 × 10–5 for nanocubes, 1.5 × 10–4 for nanoribbons, and 2.9 × 10–4 for nanowires, thus clearly revealing shape-dependence. Moreover, we achieved blue circular polarized luminescence for all three kinds of samples, with the average luminescence dissymmetry factor, |glum|, of 1.4 × 10–4, 4 × 10–4, and 5.2 × 10–4 for nanocubes, nanoribbons, and nanowires, respectively. © 2024 American Chemical Society.

Citation Format(s)

Blue Circularly Polarized Luminescence from Quantum-Confined CsPbBr3 Nanocrystals with a Different Degree of Shape Anisotropy. / Zhu, Ding; Tang, Bing; Wu, Ye et al.
In: The Journal of Physical Chemistry C, Vol. 128, No. 21, 30.05.2024, p. 8689–8697.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review