Time-resolved photoluminescence spectroscopy of ligand-capped PbS nanocrystals

被引：138

作者：

Warner, JH ^{[1
]}

Thomsen, E ^{[1
]}

Watt, AR ^{[1
]}

Heckenberg, NR ^{[1
]}

Rubinsztein-Dunlop, H ^{[1
]}

机构：

[1] Univ Queensland, Sch Phys Sci, Ctr Quantum Comp Technol, Brisbane, Qld 4072, Australia

来源：

NANOTECHNOLOGY | 2005年 / 16卷 / 02期

关键词：

D O I：

10.1088/0957-4484/16/2/001

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

PbS nanocrystals are synthesized using colloidal techniques and have their surfaces capped with oleic acid. The absorption band edge of the PbS nanocrystals is tuned between 900 and 580 nm. The PbS nanocrystals exhibit tuneable photoluminescence with large non-resonant Stokes shifts of up to 500 mcV. The magnitude of the Stokes shift is found to be dependent upon the size of PbS nanocrystals. Time-resolved photoluminescence spectroscopy of the PbS nanocrystals reveals that the photouminescence has an extraordinarily long lifetime of 1 mus. This long fluorescence lifetime is attributed to the effect of dielectric screening similar to that observed in other IV-VI semiconductor nanocrystals.

引用

页码：175 / 179

页数：5

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