Unconventional photoluminescence upconversion from PbS quantum dots

被引：21

作者：

Fernee, Mark J. ^{[1
]}

Jensen, Peter ^{[1
]}

Rubinsztein-Dunlop, Halina ^{[1
]}

机构：

[1] Univ Queensland, Sch Phys Sci, Ctr Quantum Comp Technol, St Lucia, Qld 4072, Australia

来源：

APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 04期

基金：

澳大利亚研究理事会;

关键词：

ANTI-STOKES PHOTOLUMINESCENCE; NANOCRYSTALS; SPECTROSCOPY; LUMINESCENCE; STATE;

D O I：

10.1063/1.2760140

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The authors report a type of photoluminescence upconversion that is directly attributable to the strong quantum confinement of charge carriers in PbS nanocrystals and does not involve the usual mechanism of thermally populated intermediate states. Absorption, emission, and excitation spectroscopy, combined with a simple spectral model, reveals that the upconversion process is consistent with single-photon absorption by an extremely broad single nanocrystal absorption line. This type of upconversion is a result of the time-energy uncertainty principle, indicating unusually rapid dephasing in this system, and stands in direct contrast to the mechanisms proposed for upconversion in other types of nanocrystal. (C) 2007 American Institute of Physics.

引用

页数：3

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