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

被引：105

作者：

Ushakova, Elena V. ^{[1
]}

Litvin, Aleksandr P. ^{[1
]}

Parfenov, Peter S. ^{[1
]}

Fedorov, Anatoly V. ^{[1
]}

Artemyev, Mikhail ^{[2
]}

Prudnikau, Anatoly V. ^{[2
]}

Rukhlenko, Ivan D. ^{[3
]}

Baranov, Alexander V. ^{[1
]}

机构：

[1] Natl Res Univ Informat Technol Mech & Opt, St Petersburg 197101, Russia

[2] Belarusian State Univ, Inst Physicochem Problems, Minsk 220080, BELARUS

[3] Monash Univ, Fac Engn, Dept Elect & Comp Syst Engn, Adv Comp & Simulat Lab A L, Clayton, Vic 3800, Australia

来源：

ACS NANO | 2012年 / 6卷 / 10期

基金：

澳大利亚研究理事会; 俄罗斯基础研究基金会;

关键词：

PbS quantum dots; near-infrared; size dependence; in-gap electronic state; quantum transition dynamics; photoluminescence decay; phonon-induced transitions; OPTICAL-PROPERTIES; NANOCRYSTALS; STATE; ELECTROLUMINESCENCE; SPECTROSCOPY;

D O I：

10.1021/nn3029106

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 similar to 2.5 to 0.25 mu s) with the increase in the quantum dots' diameter is explained by the existence of phonon-induced transitions between the in-gap state-whose energy drastically depends on the diameter-and the fundamental state of the quantum dots.

引用

页码：8913 / 8921

页数：9

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