Anomalous photoluminescence in CdSe quantum-dot solids at high pressure due to nonuniform stress

被引：22

作者：

Grant, Christian D. ^{[1
]}

Crowhurst, Jonathan C. ^{[1
]}

Hamel, Sebastien ^{[2
]}

Williamson, Andrew J. ^{[2
]}

Zaitseva, Natalia ^{[2
]}

机构：

[1] Lawrence Livermore Natl Lab, Div Chem Sci, Chem Mat Earth & Life Sci Directorate, Livermore, CA 94551 USA

[2] Lawrence Livermore Natl Lab, H Div, Phys & Adv Technol Directorate, Livermore, CA 94551 USA

来源：

SMALL | 2008年 / 4卷 / 06期

关键词：

cadmium selenide; nanocrystalline materials; photoluminescence; pressure; quantum dots;

D O I：

10.1002/smll.200701097

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The application of static high pressure provides a means to precisely control and investigate many fundamental and unique properties of nanoparticles. CdSe is a model quantum-dot system, the behavior of which under high pressure has been extensively studied; however, the effect of nonuniform stresses on this system has not been fully appreciated. Photoluminescence data obtained from CdSe quantum-dot solids in different stress environments varying from purely uniform to highly nonuniform are presented. Small deviations from a uniform stress distribution profoundly affect the electronic Properties of this system. In nonuniform stress environments, a pronounced flattening of the photoluminescence energy is observed above 3 GPa. The observations are validated with theoretical calculations obtained using an all-atom semiempirical pseudopotential technique. This effect must be considered when investigating other potentially pressure-mediated phenomena.

引用

页码：788 / 794

页数：7