Dynamics of photoluminescence in medium-size CdSe quantum crystallites

被引：19

作者：

Lefebvre, P ^{[1
]}

Mathieu, H ^{[1
]}

Allegre, J ^{[1
]}

Richard, T ^{[1
]}

CombettesRoos, A ^{[1
]}

Pauthe, M ^{[1
]}

Granier, W ^{[1
]}

机构：

[1] UNIV MONTPELLIER 2,CNRS,PHYS MAT CONDENSEE LAB,F-34095 MONTPELLIER 5,FRANCE

来源：

SEMICONDUCTOR SCIENCE AND TECHNOLOGY | 1997年 / 12卷 / 08期

关键词：

D O I：

10.1088/0268-1242/12/8/005

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We have measured time-resolved photoluminescence of high-quality CdSe nanocrystallites with diameters larger than the bulk exciton Bohr diameter, embedded in sodium borosilicate matrix. Such a weak-confinement situation yields sharper lines than those usually observed for much smaller nanocrystals, due to smaller size-distribution effects. Consequently, several contributions are spectrally separated, with different temporal behaviours. Three different mechanisms are identified. The first one, corresponding to near-band-edge emissions, at the highest photon energies, is very fast (tau similar to 30-50 ps) and involves 'free' excitons. The second one (tau similar to 150-300 ps) involves surface trapped excitons. The third one, at rather lower energy, is a slow regime (tau similar to 2-14 ns) involving radiative and non-radiative transitions between carriers trapped at the surface sites. The observed temporal and spectral behaviours are analysed in terms of the possibility of bleaching the absorption of such medium-size nanocrystals under high photoexcitation.

引用

页码：958 / 965

页数：8

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