Quantum-Confined Stark Effect in Ensemble of Colloidal Semiconductor Quantum Dots

被引：6
作者：
Wang Zhi-Bing [1 ]
Zhang Hui-Chao [1 ]
Zhang Jia-Yu [1 ]
Su, Huaipeng [2 ]
Wang, Y. Andrew [2 ]
机构：
[1] Southeast Univ, Dept Elect Engn, Nanjing 210096, Peoples R China
[2] Ocean Nanotech LLC, Springdale, AR 72764 USA
来源：
CHINESE PHYSICS LETTERS | 2010年 / 27卷 / 12期
基金：
中国国家自然科学基金;
关键词：
LIGHT-EMITTING-DIODES; WELL STRUCTURES; ELECTRIC-FIELD; NANOCRYSTALS; ELECTROLUMINESCENCE; ELECTROABSORPTION; SPECTROSCOPY; MODULATOR; EXCITONS;
D O I：
10.1088/0256-307X/27/12/127803
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The presence of a strong, changing, randomly-oriented, local electric field, which is induced by the photo-ionization that occurs universally in colloidal semiconductor quantum dots (QDs), makes it difficult to observe the quantum-confined Stark effect in ensemble of colloidal QDs. We propose a way to inhibit such a random electric field, and a clear quantum-confined Stark shift is observed directly in close-packed colloidal QDs. Besides the applications in optical switches and modulators, our experimental results indicate how the oscillator strengths of the optical transitions are changed under external electric fields.
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页数：4
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