Advanced search
1 file | 3.35 MB Add to list

Tunable and efficient red to near-infrared photoluminescence by synergistic exploitation of core and surface silver doping of CdSe nanoplatelets

(2019) CHEMISTRY OF MATERIALS. 31(4). p.1450-1459
Author
Organization
Project
Center for nano- and biophotonics (NB-Photonics)
Abstract
We report on the synthesis of silver (Ag)-doped CdSe nanoplatelets (NPLs) via postsynthesis cation exchange, using silver acetate as the Ag precursor. High-resolution transmission electron microscopy and X-ray diffraction confirmed that the NPLs maintain their morphology and crystal structure after doping when executing the exchange under reduced temperature in an ice bath. Spectroelectrochemistry and transient absorption spectroscopy revealed that Ag+ acts as an acceptor dopant. Ag doping results in an emission that is tunable from 609 to 880 nm, with a Stokes shift up to 1 eV and a photoluminescence quantum efficiency exceeding 50%. This is achieved by varying the Ag dopant concentration, which determines the hole energy level, and by controlling the electron energy level via quantum confinement in CdSe NPLs with varying core thickness or in CdSe/CdS core/shell NPLs. As highly fluorescent materials with a strongly suppressed emission reabsorption because of the large Stokes shift, Ag-doped colloidal two-dimensional NPLs offer new opportunities for the development of colloidal nanocrystal-based optoelectronic and photonic devices such as light-emitting diodes or luminescent solar concentrators.
Keywords
DOPED CDSE, COLLOIDAL NANOCRYSTALS, ELECTRONIC IMPURITY, QUANTUM DOTS, EMISSION, THICKNESS, RECOMBINATION, SPECTROSCOPY, TRANSITION, PROSPECTS

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 3.35 MB

Citation

Please use this url to cite or link to this publication:

MLA
Khan, Ali et al. “Tunable and Efficient Red to Near-infrared Photoluminescence by Synergistic Exploitation of Core and Surface Silver Doping of CdSe Nanoplatelets.” CHEMISTRY OF MATERIALS 31.4 (2019): 1450–1459. Print.
APA
Khan, Ali, Pinchetti, V., Tanghe, I., Dang, Z., Martín-García, B., Hens, Z., Van Thourhout, D., et al. (2019). Tunable and efficient red to near-infrared photoluminescence by synergistic exploitation of core and surface silver doping of CdSe nanoplatelets. CHEMISTRY OF MATERIALS, 31(4), 1450–1459.
Chicago author-date
Khan, Ali, Valerio Pinchetti, Ivo Tanghe, Zhiya Dang, Beatriz Martín-García, Zeger Hens, Dries Van Thourhout, Pieter Geiregat, Sergio Brovelli, and Iwan Moreels. 2019. “Tunable and Efficient Red to Near-infrared Photoluminescence by Synergistic Exploitation of Core and Surface Silver Doping of CdSe Nanoplatelets.” Chemistry of Materials 31 (4): 1450–1459.
Chicago author-date (all authors)
Khan, Ali, Valerio Pinchetti, Ivo Tanghe, Zhiya Dang, Beatriz Martín-García, Zeger Hens, Dries Van Thourhout, Pieter Geiregat, Sergio Brovelli, and Iwan Moreels. 2019. “Tunable and Efficient Red to Near-infrared Photoluminescence by Synergistic Exploitation of Core and Surface Silver Doping of CdSe Nanoplatelets.” Chemistry of Materials 31 (4): 1450–1459.
Vancouver
1.
Khan A, Pinchetti V, Tanghe I, Dang Z, Martín-García B, Hens Z, et al. Tunable and efficient red to near-infrared photoluminescence by synergistic exploitation of core and surface silver doping of CdSe nanoplatelets. CHEMISTRY OF MATERIALS. 2019;31(4):1450–9.
IEEE
[1]
A. Khan et al., “Tunable and efficient red to near-infrared photoluminescence by synergistic exploitation of core and surface silver doping of CdSe nanoplatelets,” CHEMISTRY OF MATERIALS, vol. 31, no. 4, pp. 1450–1459, 2019.
@article{8607668,
  abstract     = {We report on the synthesis of silver (Ag)-doped CdSe nanoplatelets (NPLs) via postsynthesis cation exchange, using silver acetate as the Ag precursor. High-resolution transmission electron microscopy and X-ray diffraction confirmed that the NPLs maintain their morphology and crystal structure after doping when executing the exchange under reduced temperature in an ice bath. Spectroelectrochemistry and transient absorption spectroscopy revealed that Ag+ acts as an acceptor dopant. Ag doping results in an emission that is tunable from 609 to 880 nm, with a Stokes shift up to 1 eV and a photoluminescence quantum efficiency exceeding 50%. This is achieved by varying the Ag dopant concentration, which determines the hole energy level, and by controlling the electron energy level via quantum confinement in CdSe NPLs with varying core thickness or in CdSe/CdS core/shell NPLs. As highly fluorescent materials with a strongly suppressed emission reabsorption because of the large Stokes shift, Ag-doped colloidal two-dimensional NPLs offer new opportunities for the development of colloidal nanocrystal-based optoelectronic and photonic devices such as light-emitting diodes or luminescent solar concentrators.},
  author       = {Khan, Ali and Pinchetti, Valerio and Tanghe, Ivo and Dang, Zhiya and Martín-García, Beatriz and Hens, Zeger and Van Thourhout, Dries and Geiregat, Pieter and Brovelli, Sergio and Moreels, Iwan},
  issn         = {0897-4756},
  journal      = {CHEMISTRY OF MATERIALS},
  keywords     = {DOPED CDSE,COLLOIDAL NANOCRYSTALS,ELECTRONIC IMPURITY,QUANTUM DOTS,EMISSION,THICKNESS,RECOMBINATION,SPECTROSCOPY,TRANSITION,PROSPECTS},
  language     = {eng},
  number       = {4},
  pages        = {1450--1459},
  title        = {Tunable and efficient red to near-infrared photoluminescence by synergistic exploitation of core and surface silver doping of CdSe nanoplatelets},
  url          = {http://dx.doi.org/10.1021/acs.chemmater.8b05334},
  volume       = {31},
  year         = {2019},
}

Altmetric
View in Altmetric
Web of Science
Times cited: