Photooxidation and photobleaching of single CdSe/ZnS quantum dots probed by room-temperature time-resolved spectroscopy

被引：355

作者：

van Sark, WGJHM

Frederix, PLTM

Van den Heuvel, DJ

Gerritsen, HC

Bol, AA

van Lingen, JNJ

Donegá, CD

Meijerink, A

机构：

[1] Univ Utrecht, Debye Inst, Dept Mol Biophys, NL-3508 TA Utrecht, Netherlands

[2] Univ Utrecht, Debye Inst, Dept Phys & Chem Condensed Matter, NL-3508 TA Utrecht, Netherlands

[3] Univ Utrecht, Fac Med, Dept Med Physiol, NL-3508 TA Utrecht, Netherlands

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2001年 / 105卷 / 35期

关键词：

D O I：

10.1021/jp012018h

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 room-temperature luminescence of single CdSe/ZnS core-shell quantum dots is investigated by spectrally and temporally resolved confocal microscopy. A large (30 nm) blue shift is observed in the emission wavelength during illumination in air. In nitrogen, no blue shift is observed. The blue shift in air is ascribed to a 1 nm shrinkage of the CdSe core by photooxidation. Photobleaching occurs about 4 times faster in air than in nitrogen, indicating the formation of nonradiative recombination centers during photooxidation. The initial light output is higher in air than in nitrogen, which may be due to a reduction of the defect state lifetime by oxygen.

引用

页码：8281 / 8284

页数：4

共 32 条

[21]

Koberling F, 2001, ADV MATER, V13, P672, DOI 10.1002/1521-4095(200105)13:9<672::AID-ADMA672>3.3.CO

[22]

2-N

[23] Nonexponential "blinking" kinetics of single CdSe quantum dots: A universal power law behavior [J].