Temperature dependent recombination dynamics in InP/ZnS colloidal nanocrystals

Roza Shirazi; Oleksii Kopylov; András Kovács; Beata Kardynal

doi:10.1063/1.4749276

Temperature dependent recombination dynamics in InP/ZnS colloidal nanocrystals

Roza Shirazi, Oleksii Kopylov, András Kovács, Beata Kardynal

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Abstract

In this letter, we investigate exciton recombination in InP/ZnS core-shell colloidal nanocrystals over a wide temperature range. Over the entire range between room temperature and liquid helium temperature, multi-exponential exciton decay curves are observed and well explained by the presence of bright and dark exciton states, as well as defect states. Two different types of defect are present: one located at the core-shell interface and the other on the surface of the nanocrystal. Based on the temperature dependent contributions of all four states to the total photoluminescence signal, we estimate that the four states are distributed within a 20 meV energy band in nanocrystals that emit at 1.82 eV.

Original language	English
Journal	Applied Physics Letters
Volume	101
Issue number	9
Pages (from-to)	091910
Number of pages	4
ISSN	0003-6951
DOIs	https://doi.org/10.1063/1.4749276
Publication status	Published - 2012

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Copyright (2012) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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title = "Temperature dependent recombination dynamics in InP/ZnS colloidal nanocrystals",

abstract = "In this letter, we investigate exciton recombination in InP/ZnS core-shell colloidal nanocrystals over a wide temperature range. Over the entire range between room temperature and liquid helium temperature, multi-exponential exciton decay curves are observed and well explained by the presence of bright and dark exciton states, as well as defect states. Two different types of defect are present: one located at the core-shell interface and the other on the surface of the nanocrystal. Based on the temperature dependent contributions of all four states to the total photoluminescence signal, we estimate that the four states are distributed within a 20 meV energy band in nanocrystals that emit at 1.82 eV.",

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AU - Shirazi, Roza

AU - Kopylov, Oleksii

AU - Kovács, András

AU - Kardynal, Beata

N1 - Copyright (2012) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

PY - 2012

Y1 - 2012

N2 - In this letter, we investigate exciton recombination in InP/ZnS core-shell colloidal nanocrystals over a wide temperature range. Over the entire range between room temperature and liquid helium temperature, multi-exponential exciton decay curves are observed and well explained by the presence of bright and dark exciton states, as well as defect states. Two different types of defect are present: one located at the core-shell interface and the other on the surface of the nanocrystal. Based on the temperature dependent contributions of all four states to the total photoluminescence signal, we estimate that the four states are distributed within a 20 meV energy band in nanocrystals that emit at 1.82 eV.

AB - In this letter, we investigate exciton recombination in InP/ZnS core-shell colloidal nanocrystals over a wide temperature range. Over the entire range between room temperature and liquid helium temperature, multi-exponential exciton decay curves are observed and well explained by the presence of bright and dark exciton states, as well as defect states. Two different types of defect are present: one located at the core-shell interface and the other on the surface of the nanocrystal. Based on the temperature dependent contributions of all four states to the total photoluminescence signal, we estimate that the four states are distributed within a 20 meV energy band in nanocrystals that emit at 1.82 eV.

U2 - 10.1063/1.4749276

DO - 10.1063/1.4749276

M3 - Journal article

SN - 0003-6951

VL - 101

SP - 091910

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 9

ER -

Temperature dependent recombination dynamics in InP/ZnS colloidal nanocrystals

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