Absolute Photoluminescence Quantum Yields of IR-26 Dye, PbS, and PbSe Quantum Dots

被引：257

作者：

Semonin, Octavi E. ^{[1
]}

Johnson, Justin C. ^{[1
]}

Luther, Joseph M. ^{[1
]}

Midgett, Aaron G. ^{[1
]}

Nozik, Arthur J. ^{[1
]}

Beard, Matthew C. ^{[1
]}

机构：

[1] Natl Renewable Energy Lab, Golden, CO 80401 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2010年 / 1卷 / 16期

关键词：

Nanoparticles and Nanostructures; ABSORPTION CROSS-SECTION; COLLOIDAL NANOCRYSTALS; ELECTRONIC-STRUCTURE; LIFETIME; SELENIDE;

D O I：

10.1021/jz100830r

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, we have directly measured the photoluminescence quantum yield (Phi(PL)) of 1R-26 at a range of concentrations and the Phi(PL), of PbS and PbSe QDs for a range of sizes. We find that the Phi(PL) of IR-26 has a weak concentration dependence due to reabsorption, with a Phi(PL) of 0 048 +/- 0.002% for low concentrations, lower than previous reports by a full order of magnitude. We also find that there is a dramatic size dependence for both PbS and PbSe QDs. with the smallest dots exhibiting a Phi(PL) in excess of 60%, while larger dots fall below 3% A model, including nonradiative transition between electronic states and energy transfer to ligand vibrations, appears to explain this size dependence These 20 findings provide both a better characterization of photoluminescence for near-

引用

页码：2445 / 2450

页数：6

共 29 条

[1] Quantum dots as cellular probes [J].