Transient photoluminescence and simultaneous amplified spontaneous emission from multiexciton states in CdSe quantum dots

被引：114

作者：

Caruge, JM ^{[1
]}

Chan, YT ^{[1
]}

Sundar, V ^{[1
]}

Eisler, HJ ^{[1
]}

Bawendi, MG ^{[1
]}

机构：

[1] MIT, Dept Chem, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 08期

关键词：

D O I：

10.1103/PhysRevB.70.085316

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use transient photoluminescence to spectrally resolve the emission from 1, 2, and 3 electron-hole pairs states in CdSe colloidal quantum dots with radii ranging between 2.3 and 5.2 nm. The power dependence of the triexciton, biexciton and single exciton emission intensities are reported. We incorporate CdSe/ZnS core-shell nanocrystals into a TiO2 host matrix and observe simultaneous amplified spontaneous emission from the 1S(3/2)-1Se and 1P(3/2)-1P(e) quantum dot transitions. The achievement of amplified spontaneous emission from the 1P(e) QD state suggests that the 1P(e) state sixfold degeneracy might be lifted by the e-h exchange interaction.

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收藏

页码：085316 / 1

页数：7

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