碲掺杂CdSe胶体量子点双激子态的大蓝移
A Large Blue Shift of the Biexciton State in Tellurium Doped CdSe Colloidal Quantum Dots
摘要：
实验研究了碲掺杂CdSe胶体量子点的激子-激子相互作用能。这些点在两个激子之间表现出强烈的库仑排斥，这导致了高达300 meV的巨大的测量双激子蓝移。如此强的库仑排斥意味着在缺陷周围局域化的非常窄的空穴波函数，这表现为大的斯托克斯位移。此外，我们还发现双激子的蓝移随斯托克斯位移线性增加。该结果与使用胶体QD作为光学增益介质高度相关，其中需要大的双激子蓝移以在单激子区域中获得增益。
英文摘要：
The exciton-exciton interaction energy of Tellurium doped CdSe colloidal quantum dots is experimentally investigated. The dots exhibit a strong Coulomb repulsion between the two excitons, which results in a huge measured biexciton blue shift of up to 300 meV. Such a strong Coulomb repulsion implies a very narrow hole wave function localized around the defect, which is manifested by a large Stokes shift. Moreover, we show that the biexciton blue shift increases linearly with the Stokes shift. This result is highly relevant for the use of colloidal QDs as optical gain media, where a large biexciton blue shift is required to obtain gain in the single exciton regime.
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