Anomalous Size-Dependent Decay of Low-Energy Luminescence from PbS Quantum Dots in Colloidal Solution

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• 作者：Elena V. Ushakova ; Aleksandr P. Litvin ; Peter S. Parfenov ; Anatoly V. Fedorov ; Mikhail Artemyev ; Anatoly V. Prudnikau ; Ivan D. Rukhlenko ; Alexander V. Baranov
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：October 23, 2012
• 年：2012
• 卷：6
• 期：10
• 页码：8913-8921
• 全文大小：491K
• 年卷期：v.6,no.10(October 23, 2012)
• ISSN：1936-086X

文摘

We report on an anomalous size dependence of the room-temperature photoluminescence decay time from the lowest-energy state of PbS quantum dots in colloidal solution, which was found using the transient luminescence spectroscopy. The observed 10-fold reduction in the decay time (from 2.5 to 0.25 渭s) with the increase in the quantum dots鈥?diameter is explained by the existence of phonon-induced transitions between the in-gap state鈥攚hose energy drastically depends on the diameter鈥攁nd the fundamental state of the quantum dots.

Keywords:

PbS quantum dots; near-infrared; size dependence; in-gap electronic state; quantum transition dynamics; photoluminescence decay; phonon-induced transitions