Colloidal InP/ZnS Core-Shell Nanocrystals Studied by Linearly and Circularly Polarized Photoluminescence

L. Langof; L. Fradkin; E. Ehrenfreund; E. Lifshitz; O. I. Micic; A. J. Nozik

doi:10.1016/j.chemphys.2003.10.016

Colloidal InP/ZnS Core-Shell Nanocrystals Studied by Linearly and Circularly Polarized Photoluminescence

L. Langof, L. Fradkin, E. Ehrenfreund, E. Lifshitz, O. I. Micic, A. J. Nozik

Chemistry and Nanoscience

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Abstract

The magneto-optical properties of InP/ZnS core-shell nanocrystals (NCs) were investigated by measuring the degree of linear and circular polarization of photoluminescence (PL) spectra, in the presence of an external magnetic field under resonant or non-resonant excitation. The linearly polarized PL data strongly indicate that InP/ZnS NCs have a prolongated shape. The resonant-excited circularly polarized PL decay curves indicate that the spin relaxation time of the studied samples is shorter than the radiative lifetime of their exciton. Furthermore, the magnetic field-induced circularly polarized PL process reveals an exciton g factor (g_ex) of 0.55. Thus, such studies may serve as a tool to directly estimate the NC's shape anisotropy and to determine the g-factor of charge carriers and excitons in those NCs.

Original language	American English
Pages (from-to)	93-98
Number of pages	6
Journal	Chemical Physics
Volume	297
Issue number	1-3
DOIs	https://doi.org/10.1016/j.chemphys.2003.10.016 https://doi.org/10.1016/j.chemphys.2003.10.016
State	Published - 2004

NREL Publication Number

NREL/JA-590-35926

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title = "Colloidal InP/ZnS Core-Shell Nanocrystals Studied by Linearly and Circularly Polarized Photoluminescence",

abstract = "The magneto-optical properties of InP/ZnS core-shell nanocrystals (NCs) were investigated by measuring the degree of linear and circular polarization of photoluminescence (PL) spectra, in the presence of an external magnetic field under resonant or non-resonant excitation. The linearly polarized PL data strongly indicate that InP/ZnS NCs have a prolongated shape. The resonant-excited circularly polarized PL decay curves indicate that the spin relaxation time of the studied samples is shorter than the radiative lifetime of their exciton. Furthermore, the magnetic field-induced circularly polarized PL process reveals an exciton g factor (gex) of 0.55. Thus, such studies may serve as a tool to directly estimate the NC's shape anisotropy and to determine the g-factor of charge carriers and excitons in those NCs.",

author = "L. Langof and L. Fradkin and E. Ehrenfreund and E. Lifshitz and Micic, {O. I.} and Nozik, {A. J.}",

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doi = "10.1016/j.chemphys.2003.10.016",

language = "American English",

volume = "297",

pages = "93--98",

journal = "Chemical Physics",

issn = "0301-0104",

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TY - JOUR

T1 - Colloidal InP/ZnS Core-Shell Nanocrystals Studied by Linearly and Circularly Polarized Photoluminescence

AU - Langof, L.

AU - Fradkin, L.

AU - Ehrenfreund, E.

AU - Lifshitz, E.

AU - Micic, O. I.

AU - Nozik, A. J.

PY - 2004

Y1 - 2004

N2 - The magneto-optical properties of InP/ZnS core-shell nanocrystals (NCs) were investigated by measuring the degree of linear and circular polarization of photoluminescence (PL) spectra, in the presence of an external magnetic field under resonant or non-resonant excitation. The linearly polarized PL data strongly indicate that InP/ZnS NCs have a prolongated shape. The resonant-excited circularly polarized PL decay curves indicate that the spin relaxation time of the studied samples is shorter than the radiative lifetime of their exciton. Furthermore, the magnetic field-induced circularly polarized PL process reveals an exciton g factor (gex) of 0.55. Thus, such studies may serve as a tool to directly estimate the NC's shape anisotropy and to determine the g-factor of charge carriers and excitons in those NCs.

AB - The magneto-optical properties of InP/ZnS core-shell nanocrystals (NCs) were investigated by measuring the degree of linear and circular polarization of photoluminescence (PL) spectra, in the presence of an external magnetic field under resonant or non-resonant excitation. The linearly polarized PL data strongly indicate that InP/ZnS NCs have a prolongated shape. The resonant-excited circularly polarized PL decay curves indicate that the spin relaxation time of the studied samples is shorter than the radiative lifetime of their exciton. Furthermore, the magnetic field-induced circularly polarized PL process reveals an exciton g factor (gex) of 0.55. Thus, such studies may serve as a tool to directly estimate the NC's shape anisotropy and to determine the g-factor of charge carriers and excitons in those NCs.

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U2 - 10.1016/j.chemphys.2003.10.016

DO - 10.1016/j.chemphys.2003.10.016

M3 - Article

AN - SCOPUS:0347130881

SN - 0301-0104

VL - 297

SP - 93

EP - 98

JO - Chemical Physics

JF - Chemical Physics

IS - 1-3

ER -

Colloidal InP/ZnS Core-Shell Nanocrystals Studied by Linearly and Circularly Polarized Photoluminescence

Abstract

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