Open Access
Journal of Physics: Conference Series, volume 961, pages 12003
Effect of temperature on the spectral properties of InP/ZnS nanocrystals
Publication type: Journal Article
Publication date: 2018-01-01
Quartile SCImago
— Quartile WOS
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Impact factor: —
ISSN: 17426588, 17426596
General Physics and Astronomy
Abstract
Optical absorption (OA) and photoluminescence (PL) spectra of InP/ZnS core/shell nanocrystals with 2.3 nm average size were investigated in the temperature range of 6.5–296 K. Using second derivative spectrophotometry technique energies of the OA transitions at 296 K in quantum dot (QD) solutions and films are evaluated to be E 1 = 2.37, E 2 = 4.10 and E 3 = 4.68 eV. Temperature shifts of the E 1 and E 2 levels are found to result from interaction with effective phonons of 59 and 37 meV energies, respectively. Herewith the 370 meV half-width of the first exciton absorption peak remains constant due to the dominance of inhomogeneous broadening effects caused by QD parameters distribution. Measured PL spectra have a complex structure and can be described in 6.5–296 K range by two independent Gaussian components associated with exciton and defect-related states. In addition, Stokes shift of 320 meV is observed to decrease at T > 200 K. PL thermal quenching analysis in frame of Mott mechanism points to presence of non-radiative relaxation channel with an activation energy of 74 meV.
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Savchenko S. S., Vokhmintsev A. S., Weinstein I. Effect of temperature on the spectral properties of InP/ZnS nanocrystals // Journal of Physics: Conference Series. 2018. Vol. 961. p. 12003.
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Savchenko S. S., Vokhmintsev A. S., Weinstein I. Effect of temperature on the spectral properties of InP/ZnS nanocrystals // Journal of Physics: Conference Series. 2018. Vol. 961. p. 12003.
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TY - JOUR
DO - 10.1088/1742-6596/961/1/012003
UR - https://doi.org/10.1088/1742-6596/961/1/012003
TI - Effect of temperature on the spectral properties of InP/ZnS nanocrystals
T2 - Journal of Physics: Conference Series
AU - Savchenko, Sergey S
AU - Vokhmintsev, A S
AU - Weinstein, I.A.
PY - 2018
DA - 2018/01/01 00:00:00
PB - IOP Publishing
SP - 12003
VL - 961
SN - 1742-6588
SN - 1742-6596
ER -
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@article{2018_Savchenko,
author = {Sergey S Savchenko and A S Vokhmintsev and I.A. Weinstein},
title = {Effect of temperature on the spectral properties of InP/ZnS nanocrystals},
journal = {Journal of Physics: Conference Series},
year = {2018},
volume = {961},
publisher = {IOP Publishing},
month = {jan},
url = {https://doi.org/10.1088/1742-6596/961/1/012003},
pages = {12003},
doi = {10.1088/1742-6596/961/1/012003}
}
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