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

verfasst von
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.

Organisationseinheit(en)
Fakultät für Mathematik und Physik
Institut für Physikalische Chemie und Elektrochemie
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
Institut für Festkörperphysik
Laboratorium für Nano- und Quantenengineering
Externe Organisation(en)
Université de Lille 1
Eberhard Karls Universität Tübingen
Typ
Artikel
Journal
Nano letters
Band
24
Seiten
16293-16300
Anzahl der Seiten
8
ISSN
1530-6984
Publikationsdatum
25.12.2024
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Bioengineering, Allgemeine Chemie, Allgemeine Materialwissenschaften, Physik der kondensierten Materie, Maschinenbau
Elektronische Version(en)
https://doi.org/10.1021/acs.nanolett.4c04402 (Zugang: Offen)