Highly Emissive Multiexcitons in Steady-State Photoluminescence of Individual "Giant" CdSe/CdS Core/Shell Nanocrystals

被引：151

作者：

Htoon, H. ^{[1
,2
,3
]}

Malko, A. V. ^{[4
]}

Bussian, D. ^{[1
,2
]}

Vela, J. ^{[1
]}

Chen, Y. ^{[1
]}

Hollingsworth, J. A. ^{[1
,2
,3
]}

Klimov, V. I. ^{[1
,3
]}

机构：

[1] Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[3] Los Alamos Natl Lab, Ctr Adv Solar Photophys, Los Alamos, NM 87545 USA

[4] Univ Texas Dallas, Dept Phys, Richardson, TX 75080 USA

来源：

NANO LETTERS | 2010年 / 10卷 / 07期

关键词：

Nanocrystal; quantum dot; charged nanocrystal; single-dot photoluminescence; multiexciton; Auger recombination; SEMICONDUCTOR NANOCRYSTALS; QUANTUM DOTS; BLINKING; GAIN;

D O I：

10.1021/nl1004652

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The development of nanocrystal quantum dots (NQDs) with suppressed nonradiative Auger recombination has been an important goal in colloidal nanostructure research motivated by the needs of prospective applications in lasing devices, light-emitting diodes, and photovoltaic cells Here, we conduct single-nanocrystal spectroscopic studies of recently developed core shell NQDs (so-called "giant" NQDs) that comprise a small CdSe core surrounded by a 16-monolayer-thick CdS shell Using both continuous-wave and pulsed excitation, we observe strong emission features due both to neutral and charged biexcitons, as well as multiexcitons of higher order The development of pronounced multiexcitonic peaks in steady-state photoluminescence of individual nanocrystals. as well as continuous growth of the emission intensity in the range of high pump levels, point toward a significant suppression of nonradiative Auger decay that normally renders multiexcitons nonemissive The unusually high multiexciton emission efficiencies in these systems open interesting opportunities for studies of multiexciton phenomena using well-established methods of single-dot spectroscopy, as well as new exciting prospects for applications, that have previously been hampered by nonradiative Auger decay

引用

页码：2401 / 2407

页数：7

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