Inorganic surface passivation of PbS nanocrystals resulting in strong photoluminescent emission

被引：57

作者：

Fernée, MJ ^{[1
]}

Watt, A

Warner, J

Cooper, S

Heckenberg, N

Rubinsztein-Dunlop, H

机构：

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

[2] Univ Queensland, Ctr Biophoton & Laser Sci, Brisbane, Qld 4072, Australia

来源：

NANOTECHNOLOGY | 2003年 / 14卷 / 09期

关键词：

D O I：

10.1088/0957-4484/14/9/311

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Strong photoluminescent emission has been obtained from 3 urn PbS nanocrystals in aqueous colloidal solution, following treatment with CdS precursors. The observed emission can extend across the entire visible spectrum and usually includes a peak near 1.95 eV. We show that much of the visible emission results from absorption by higher-lying excited states above 3.0 eV with subsequent relaxation to and emission from states lying above the observed band-edge of the PbS nanocrystals. The fluorescent lifetimes for this emission are in the nanosecond regime, characteristic of exciton recombination.

引用

页码：991 / 997

页数：7

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