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.
Abstract：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.
WANG Zhi-Bing;ZHANG Hui-Chao;ZHANG Jia-Yu**;Huaipeng Su;Y. Andrew Wang. Quantum-Confined Stark Effect in Ensemble of Colloidal Semiconductor Quantum Dots[J]. 中国物理快报, 2010, 27(12): 127803-127803.
WANG Zhi-Bing, ZHANG Hui-Chao, ZHANG Jia-Yu**, Huaipeng Su, Y. Andrew Wang. Quantum-Confined Stark Effect in Ensemble of Colloidal Semiconductor Quantum Dots. Chin. Phys. Lett., 2010, 27(12): 127803-127803.
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