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Emergent Circularly Polarized Luminescence from Self-Assembled Chiral-Ligand-Functionalized CsPbBr3 Nanocrystals

Mandal, Prasenjit LU orcid ; Chaudhary, Mohit ; Cloarec, Jeanne LU ; Prezhdo, Oleg V. and Baranov, Dmitry LU orcid (2026) In Nano Letters 26(38). p.12716-12724
Abstract
Chiral surface ligands can impart optical activity to
all-inorganic
perovskite nanocrystals, but how this affects chiroptical properties
of their assemblies remains unclear. Here we show that self-assembly
of CsPbBr3 nanocubes synthesized with a small amount of
added chiral ligand N-benzylcinchonidinium bromide
(BCD-Br) results in measurable circularly polarized luminescence (CPL).
BCD-Br-treated nanocrystals show weak circular dichroism but no detectable
CPL in colloidal dispersion. Upon assembly into CsPbBr3 and mixed halide superlattices, they exhibit CPL with a luminescence
dissymmetry factor, glum, of (5 ±
2) × 10–3, whereas untreated... (More)
Chiral surface ligands can impart optical activity to
all-inorganic
perovskite nanocrystals, but how this affects chiroptical properties
of their assemblies remains unclear. Here we show that self-assembly
of CsPbBr3 nanocubes synthesized with a small amount of
added chiral ligand N-benzylcinchonidinium bromide
(BCD-Br) results in measurable circularly polarized luminescence (CPL).
BCD-Br-treated nanocrystals show weak circular dichroism but no detectable
CPL in colloidal dispersion. Upon assembly into CsPbBr3 and mixed halide superlattices, they exhibit CPL with a luminescence
dissymmetry factor, glum, of (5 ±
2) × 10–3, whereas untreated controls remain
near the noise level. Polarization-resolved transient absorption (TA)
reveals an extended spin lifetime of hundreds of picoseconds in BCD-Br-treated
nanocrystals, while linear-response time-dependent density functional
theory (LR-TDDFT) calculations suggest that inter-nanocrystal coupling
can enhance the chiroptical response. These results support the idea
that ordered nanocrystal assembly can convert weak ligand-induced
chirality into an emergent chiroptical response in perovskite nanocrystal
solids. (Less)
Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nano Letters
volume
26
issue
38
pages
12716 - 12724
publisher
The American Chemical Society (ACS)
ISSN
1530-6992
DOI
10.1021/acs.nanolett.6c02634
project
Chiral Light Emitting Diodes based in Photonic Architectures
Engineering of Superfluorescent Nanocrystal Solids
Nanocrystal Solids for Quantum Technology
Tennbaserade nanostrukturer för optisk kvantteknologi
language
English
LU publication?
yes
id
0ed1c524-1693-4011-a2f6-34a594168bc2
date added to LUP
2026-09-21 15:11:54
date last changed
2026-10-02 09:13:00
@article{0ed1c524-1693-4011-a2f6-34a594168bc2,
  abstract     = {{Chiral surface ligands can impart optical activity to<br>
all-inorganic<br>
perovskite nanocrystals, but how this affects chiroptical properties<br>
of their assemblies remains unclear. Here we show that self-assembly<br>
of CsPbBr<sub>3</sub> nanocubes synthesized with a small amount of<br>
added chiral ligand <em>N</em>-benzylcinchonidinium bromide<br>
(BCD-Br) results in measurable circularly polarized luminescence (CPL).<br>
BCD-Br-treated nanocrystals show weak circular dichroism but no detectable<br>
CPL in colloidal dispersion. Upon assembly into CsPbBr<sub>3</sub> and mixed halide superlattices, they exhibit CPL with a luminescence<br>
dissymmetry factor, <em>g</em><sub>lum</sub>, of (5 ±<br>
2) × 10<sup>–3</sup>, whereas untreated controls remain<br>
near the noise level. Polarization-resolved transient absorption (TA)<br>
reveals an extended spin lifetime of hundreds of picoseconds in BCD-Br-treated<br>
nanocrystals, while linear-response time-dependent density functional<br>
theory (LR-TDDFT) calculations suggest that inter-nanocrystal coupling<br>
can enhance the chiroptical response. These results support the idea<br>
that ordered nanocrystal assembly can convert weak ligand-induced<br>
chirality into an emergent chiroptical response in perovskite nanocrystal<br>
solids.}},
  author       = {{Mandal, Prasenjit and Chaudhary, Mohit and Cloarec, Jeanne and Prezhdo, Oleg V. and Baranov, Dmitry}},
  issn         = {{1530-6992}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{38}},
  pages        = {{12716--12724}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Nano Letters}},
  title        = {{Emergent Circularly Polarized Luminescence from Self-Assembled Chiral-Ligand-Functionalized CsPbBr<sub>3</sub> Nanocrystals}},
  url          = {{http://dx.doi.org/10.1021/acs.nanolett.6c02634}},
  doi          = {{10.1021/acs.nanolett.6c02634}},
  volume       = {{26}},
  year         = {{2026}},
}