Sub-millielectronvolt Line Widths in Polarized Low-Temperature Photoluminescence of 2D PbS Nanoplatelets

authored by: Pengji Li, Leon Biesterfeld, Lars F. Klepzig, Jingzhong Yang, Huu Thoai Ngo, Ahmed Addad, Tom N. Rakow, Ruolin Guan, Eddy P. Rugeramigabo, Ivan Zaluzhnyy, Frank Schreiber, Louis Biadala, Jannika Lauth, Michael Zopf
Abstract: Colloidal semiconductor nanocrystals are promising materials for classical and quantum light sources due to their efficient photoluminescence (PL) and versatile chemistry. While visible emitters are well-established, excellent (near-infrared) sources are still being pursued. We present the first comprehensive analysis of low-temperature PL from two-dimensional (2D) PbS nanoplatelets (NPLs). Ultrathin 2D PbS NPLs exhibit high crystallinity confirmed by scanning transmission electron microscopy, revealing Moiré patterns in overlapping NPLs. At 4 K, unique PL features are observed in single PbS NPLs, including narrow zero-phonon lines with line widths down to 0.6 meV and a linear degree of polarization up to 90%. Time-resolved measurements identify trions as the dominant emission source with a 2.3 ns decay time. Sub-meV spectral diffusion and no inherent blinking over minutes are observed, as well as discrete spectral jumps without memory effects. These findings advance the understanding and underscore the potential of colloidal PbS NPLs for optical and quantum technologies.
Organisation(s): Faculty of Mathematics and Physics
Institute of Physical Chemistry and Electrochemistry
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines
Institute of Solid State Physics
Laboratory of Nano and Quantum Engineering
External Organisation(s): Lille 1 University of Science and Technology
University of Tübingen
Type: Article
Journal: Nano letters
ISSN: 1530-6984
Publication date: 22.11.2024
Publication status: E-pub ahead of print
Peer reviewed: Yes
ASJC Scopus subject areas: Bioengineering, General Chemistry, General Materials Science, Condensed Matter Physics, Mechanical Engineering
Electronic version(s): https://doi.org/10.1021/acs.nanolett.4c04402 (Access: Open)

BibTeX

@article{1b64c45503a941baa385e0369bcd5908,
title = "Sub-millielectronvolt Line Widths in Polarized Low-Temperature Photoluminescence of 2D PbS Nanoplatelets",
abstract = "Colloidal semiconductor nanocrystals are promising materials for classical and quantum light sources due to their efficient photoluminescence (PL) and versatile chemistry. While visible emitters are well-established, excellent (near-infrared) sources are still being pursued. We present the first comprehensive analysis of low-temperature PL from two-dimensional (2D) PbS nanoplatelets (NPLs). Ultrathin 2D PbS NPLs exhibit high crystallinity confirmed by scanning transmission electron microscopy, revealing Moir{\'e} patterns in overlapping NPLs. At 4 K, unique PL features are observed in single PbS NPLs, including narrow zero-phonon lines with line widths down to 0.6 meV and a linear degree of polarization up to 90%. Time-resolved measurements identify trions as the dominant emission source with a 2.3 ns decay time. Sub-meV spectral diffusion and no inherent blinking over minutes are observed, as well as discrete spectral jumps without memory effects. These findings advance the understanding and underscore the potential of colloidal PbS NPLs for optical and quantum technologies.",
keywords = "cryogenic temperatures, PbS nanoplatelets, polarized photoluminescence, sub-meV line widths, trions",
author = "Pengji Li and Leon Biesterfeld and Klepzig, {Lars F.} and Jingzhong Yang and Ngo, {Huu Thoai} and Ahmed Addad and Rakow, {Tom N.} and Ruolin Guan and Rugeramigabo, {Eddy P.} and Ivan Zaluzhnyy and Frank Schreiber and Louis Biadala and Jannika Lauth and Michael Zopf",
note = "Publisher Copyright: {\textcopyright} 2024 The Authors.",
year = "2024",
month = nov,
day = "22",
doi = "10.1021/acs.nanolett.4c04402",
language = "English",
journal = "Nano letters",
issn = "1530-6984",
publisher = "American Chemical Society",
}