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
相关论文
共 32 条
[11]  
2-2
[12]   Photoluminescence spectroscopy of single CdSe nanocrystallite quantum dots [J].
Empedocles, SA ;
Norris, DJ ;
Bawendi, MG .
PHYSICAL REVIEW LETTERS, 1996, 77 (18) :3873-3876
[13]   Quantum-confined stark effect in single CdSe nanocrystallite quantum dots [J].
Empedocles, SA ;
Bawendi, MG .
SCIENCE, 1997, 278 (5346) :2114-2117
[14]   Charge separation in conjugated-polymer/nanocrystal blends [J].
Ginger, DS ;
Greenham, NC .
SYNTHETIC METALS, 1999, 101 (1-3) :425-428
[15]   Charge separation and transport in conjugated-polymer/semiconductor-nanocrystal composites studied by photoluminescence quenching and photoconductivity [J].
Greenham, NC ;
Peng, XG ;
Alivisatos, AP .
PHYSICAL REVIEW B, 1996, 54 (24) :17628-17637
[16]   Polarization spectroscopy of single fluorescent molecules [J].
Ha, T ;
Laurence, TA ;
Chemla, DS ;
Weiss, S .
JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (33) :6839-6850
[17]   Coverage-mediated suppression of blinking in solid state quantum dot conjugated organic composite nanostructures [J].
Hammer, Nathan I. ;
Early, Kevin T. ;
Sill, Kevin ;
Odoi, Michael Y. ;
Emrick, Todd ;
Barnes, Michael D. .
JOURNAL OF PHYSICAL CHEMISTRY B, 2006, 110 (29) :14167-14171
[18]   Near-complete suppression of quantum dot blinking in ambient conditions [J].
Hohng, S ;
Ha, T .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (05) :1324-1325
[19]   Linearly polarized 'fine structure' of the bright exciton state in individual CdSe nanocrystal quantum dots [J].
Htoon, H. ;
Furis, M. ;
Crooker, S. A. ;
Jeong, S. ;
Klimov, V. I. .
PHYSICAL REVIEW B, 2008, 77 (03)
[20]   Linearly polarized emission from colloidal semiconductor quantum rods [J].
Hu, JT ;
Li, LS ;
Yang, WD ;
Manna, L ;
Wang, LW ;
Alivisatos, AP .
SCIENCE, 2001, 292 (5524) :2060-2063
1234