Details
| Original language | English |
|---|---|
| Pages (from-to) | 19277-19285 |
| Number of pages | 9 |
| Journal | Journal of Physical Chemistry C |
| Volume | 126 |
| Issue number | 45 |
| Early online date | 3 Nov 2022 |
| Publication status | Published - 17 Nov 2022 |
Abstract
Colloidal 2D PbSe nanoplatelets (NPLs) are promising near- and short wave-infrared emitters for optoelectronic applications at telecommunication wavelengths. However, their photoluminescence quantum yield (PLQY) is limited by the ubiquitous presence of surface-related trap states. Here, we apply a treatment of colloidal PbSe NPLs with different metal halides (MX2, M = Zn, Cd, Pb; X = F, Cl, Br, I) to improve their emission brightness. A surface passivation of the NPLs by PbI2leads to the best results with a strongly increased PLQY (27% for PbSe NPLs emitting at 0.98 eV (1265 nm) and up to 61% for PbSe NPLs emitting at 1.25 eV (989 nm)). Simultaneously, the full width at half-maximum of the NPL photoluminescence decreased by 10% after the treatment. X-ray photoelectron spectroscopy and complementary surface treatment of PbSe NPLs with organic halides reveal the combined passivating role of both X-type binding halides X-and Z-type binding metal halides MX2in enhancing the optical properties of the PbSe NPLs. Our results emphasize the potential of 2D PbSe NPLs for efficient emission tailored for the application in fiber optics.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- General Energy
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Journal of Physical Chemistry C, Vol. 126, No. 45, 17.11.2022, p. 19277-19285.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Toward Bright Colloidal Near-Infrared Emitters
T2 - Surface Passivation of 2D PbSe Nanoplatelets by Metal Halides
AU - Biesterfeld, Leon
AU - Klepzig, Lars F.
AU - Niebur, André
AU - Rosebrock, Marina
AU - Lauth, Jannika
N1 - Funding Information: The authors thank the Laboratory for Nano and Quantum Engineering (LNQE) in Hannover for access to the TEM. We thank N. C. Bigall for access to the UV–vis–NIR photoluminescence spectrometer, the XPS (major equipment DFG Project 448713396), and D. Dorfs for access to the UV–vis–NIR absorption spectrometer. We are grateful to A. Feldhoff for providing the XRD facilities and to J. Caro for access to the ATR-FTIR spectrometer. L.B., L.F.K., and J.L. gratefully acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453). J.L. is thankful for additional funding by the Caroline Herschel program of the Leibniz Universität Hannover.
PY - 2022/11/17
Y1 - 2022/11/17
N2 - Colloidal 2D PbSe nanoplatelets (NPLs) are promising near- and short wave-infrared emitters for optoelectronic applications at telecommunication wavelengths. However, their photoluminescence quantum yield (PLQY) is limited by the ubiquitous presence of surface-related trap states. Here, we apply a treatment of colloidal PbSe NPLs with different metal halides (MX2, M = Zn, Cd, Pb; X = F, Cl, Br, I) to improve their emission brightness. A surface passivation of the NPLs by PbI2leads to the best results with a strongly increased PLQY (27% for PbSe NPLs emitting at 0.98 eV (1265 nm) and up to 61% for PbSe NPLs emitting at 1.25 eV (989 nm)). Simultaneously, the full width at half-maximum of the NPL photoluminescence decreased by 10% after the treatment. X-ray photoelectron spectroscopy and complementary surface treatment of PbSe NPLs with organic halides reveal the combined passivating role of both X-type binding halides X-and Z-type binding metal halides MX2in enhancing the optical properties of the PbSe NPLs. Our results emphasize the potential of 2D PbSe NPLs for efficient emission tailored for the application in fiber optics.
AB - Colloidal 2D PbSe nanoplatelets (NPLs) are promising near- and short wave-infrared emitters for optoelectronic applications at telecommunication wavelengths. However, their photoluminescence quantum yield (PLQY) is limited by the ubiquitous presence of surface-related trap states. Here, we apply a treatment of colloidal PbSe NPLs with different metal halides (MX2, M = Zn, Cd, Pb; X = F, Cl, Br, I) to improve their emission brightness. A surface passivation of the NPLs by PbI2leads to the best results with a strongly increased PLQY (27% for PbSe NPLs emitting at 0.98 eV (1265 nm) and up to 61% for PbSe NPLs emitting at 1.25 eV (989 nm)). Simultaneously, the full width at half-maximum of the NPL photoluminescence decreased by 10% after the treatment. X-ray photoelectron spectroscopy and complementary surface treatment of PbSe NPLs with organic halides reveal the combined passivating role of both X-type binding halides X-and Z-type binding metal halides MX2in enhancing the optical properties of the PbSe NPLs. Our results emphasize the potential of 2D PbSe NPLs for efficient emission tailored for the application in fiber optics.
UR - http://www.scopus.com/inward/record.url?scp=85141771019&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.2c05850
DO - 10.1021/acs.jpcc.2c05850
M3 - Article
AN - SCOPUS:85141771019
VL - 126
SP - 19277
EP - 19285
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 45
ER -