Details
| Original language | English |
|---|---|
| Journal | Nano letters |
| Early online date | 22 Nov 2024 |
| Publication status | E-pub ahead of print - 22 Nov 2024 |
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.
Keywords
- cryogenic temperatures, PbS nanoplatelets, polarized photoluminescence, sub-meV line widths, trions
ASJC Scopus subject areas
- Chemical Engineering(all)
- Bioengineering
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanical Engineering
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In: Nano letters, 22.11.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Sub-millielectronvolt Line Widths in Polarized Low-Temperature Photoluminescence of 2D PbS Nanoplatelets
AU - Li, Pengji
AU - Biesterfeld, Leon
AU - Klepzig, Lars F.
AU - Yang, Jingzhong
AU - Ngo, Huu Thoai
AU - Addad, Ahmed
AU - Rakow, Tom N.
AU - Guan, Ruolin
AU - Rugeramigabo, Eddy P.
AU - Zaluzhnyy, Ivan
AU - Schreiber, Frank
AU - Biadala, Louis
AU - Lauth, Jannika
AU - Zopf, Michael
N1 - Publisher Copyright: © 2024 The Authors.
PY - 2024/11/22
Y1 - 2024/11/22
N2 - 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.
AB - 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.
KW - cryogenic temperatures
KW - PbS nanoplatelets
KW - polarized photoluminescence
KW - sub-meV line widths
KW - trions
UR - http://www.scopus.com/inward/record.url?scp=85210115012&partnerID=8YFLogxK
U2 - 10.1021/acs.nanolett.4c04402
DO - 10.1021/acs.nanolett.4c04402
M3 - Article
AN - SCOPUS:85210115012
JO - Nano letters
JF - Nano letters
SN - 1530-6984
ER -