Polarization-Driven Stark Shifts in Quantum Dot Luminescence from Single CdSe/oligo-PPV Nanoparticles

被引：23
作者：
Early, K. T.
Sudeep, P. K.
Emrick, T.
Barnes, M. D. [1 ]
机构：
[1] Univ Massachusetts, Dept Chem, Amherst, MA 01003 USA
来源：
NANO LETTERS | 2010年 / 10卷 / 05期
基金：
美国国家科学基金会;
关键词：
Stark shift; polarization; quantum dots; single molecule; CHARGE SEPARATION; PHOTOLUMINESCENCE; NANOSTRUCTURES; BLINKING; MOLECULES; SPECTROSCOPY; ORIENTATION; SUPPRESSION;
D O I：
10.1021/nl1001789
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We demonstrate polarization-induced spectral shifts and associated linearly polarized absorption and emission in single CdSe/oligo-(phenylene vinylene) (CdSe/OPV) nanoparticles. A mechanism for these observations is presented in which charge separation from photoexcited ligands results in a significant Stark distortion of the quantum dot electron/hole wavefunctions. This distortion results in an induced linear polarization and an associated red shift in band-edge photoluminescence. These studies suggest the use of single quantum dots as local charge mobility probes.
引用
收藏
页码：1754 / 1758
页数：5
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