Bimodal bond-length distributions in cobalt-doped CdSe, ZnSe, and Cd1-xZnxSe quantum dots

被引：58

作者：

Santangelo, Steven A. ^{[1
]}

Hinds, Eric A. ^{[1
]}

Vlaskin, Vladimir A. ^{[1
]}

Archer, Paul I. ^{[1
]}

Gamelin, Daniel R. ^{[1
]}

机构：

[1] Univ Washington, Dept Chem, Seattle, WA 98195 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2007年 / 129卷 / 13期

关键词：

D O I：

10.1021/ja068260p

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Electronic absorption spectroscopy has been used to study changes in Co2+ ligand-field parameters as a function of alloy composition in Co2+-doped Cd1-xZnxSe nanocrystals. A shift in the energy of the T-4(1)(P) excited-state with alloy composition is observed. Analysis reveals that Co2+-Se2- bond lengths change relatively little as the host is varied continuously from CdSe to ZnSe, generating a large difference between microscopic and average cation-anion bond lengths in Co2+-doped CdSe nanocrystals but not in Co2+-doped ZnSe nanocrystals. The bimodal bond-length distributions observed here are shown to cause a diameter-dependent enthalpic destabilization of doped semiconductor nanocrystals.

引用

页码：3973 / 3978

页数：6

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