Colloidal InP/ZnS core-shell nanocrystals studied by linearly and circularly polarized photoluminescence

被引：28

作者：

Langof, L

Fradkin, L

Ehrenfreund, E

Lifshitz, E ^{[1
]}

Micic, OI

Nozik, AJ

机构：

[1] Technion Israel Inst Technol, Dept Chem, IL-32000 Haifa, Israel

[2] Technion Israel Inst Technol, Inst Solid State, IL-32000 Haifa, Israel

[3] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[4] Natl Renewable Energy Lab, Golden, CO 80401 USA

来源：

CHEMICAL PHYSICS | 2004年 / 297卷 / 1-3期

基金：

以色列科学基金会;

关键词：

D O I：

10.1016/j.chemphys.2003.10.016

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：93 / 98

页数：6

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