Size- and Temperature-Dependent Carrier Dynamics in Oleic Acid Capped PbS Quantum Dots
Size- and Temperature-Dependent Carrier Dynamics in Oleic Acid Capped PbS Quantum Dots
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DOI：
10.1021/jp3054108
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发表时间：
2013-01-31
影响因子：
3.7
通讯作者：
Lagoudakis, Pavlos G.
中科院分区：
文献类型：
--
作者：
Andreakou, Peristera;Brossard, Mael;Lagoudakis, Pavlos G.
在这项工作中，我们研究了直径为2.3至3.5 nm的油酸覆盖的PbS量子点在宽温度范围（6-290 K）内光致发光衰减和积分光致发光的温度依赖性。所有研究的样品表现出类似的行为，由三个不同的温度制度。低温制度（250 K）是由淬灭的光致发光强度和加速的平均寿命。我们提出了一个三能级系统，由亮，暗，和表面状态，它描述了所观察到的光致发光动力学的油酸封端的PbS量子点。
In this work, we investigate the temperature dependence of the photoluminescence decay and integrated photoluminescence of oleic acid capped PbS quantum dots with diameters ranging from 2.3 to 3.5 nm over a broad temperature range (6-290 K). All the investigated samples exhibit similar behavior, consisting of three different temperature regimes. The low-temperature regime (250 K) is governed by quenched photoluminescence intensity and acceleration in the average lifetimes. We propose a three-level system, composed of bright, dark, and surface states, which describes the observed photoluminescence dynamics of oleic acid capped PbS QDs.