Colloidal Semiconductor Quantum Dots with Tunable Surface Composition

被引：205

作者：

Wei, Helen Hisiu-Ying ^{[1
]}

Evans, Christopher M. ^{[1
]}

Swartz, Brett D. ^{[1
]}

Neukirch, Amanda J. ^{[2
]}

Young, Jeremy ^{[2
]}

Prezhdo, Oleg V. ^{[1
,2
]}

Krauss, Todd D. ^{[1
,3
]}

机构：

[1] Univ Rochester, Dept Chem, Rochester, NY 14627 USA

[2] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

[3] Univ Rochester, Inst Opt, Rochester, NY 14627 USA

来源：

NANO LETTERS | 2012年 / 12卷 / 09期

基金：

美国国家科学基金会;

关键词：

Semiconductor nanocrystals; photoluminescence; synthesis; surface composition; nonradiative relaxation; CDSE NANOCRYSTALS; LUMINESCENCE; MONODISPERSE; CORE; HYDROPHOSPHINATION; SPECTROSCOPY; ENERGY; CDTE; SE;

D O I：

10.1021/nl3012962

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Colloidal CdS quantum dots (QDs) were synthesized with tunable surface composition. Surface stoichiometry was controlled by applying reactive secondary phosphine sulfide precursors in a layer-by-layer approach. The surface composition was observed to greatly affect photoluminescence properties. Band edge emission was quenched in sulfur terminated CdS QDs and fully recovered when QDs were cadmium terminated. Calculations suggest that electronic states inside the band gap arising from surface sulfur atoms could trap charges, thus inhibiting radiative recombination and facilitating nonradiative relaxation.

引用

页码：4465 / 4471

页数：7

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