Room-temperature exciton storage in elongated semiconductor nanocrystals

被引：93

作者：

Kraus, R. M.

Lagoudakis, P. G.

Rogach, A. L.

Talapin, D. V.

Weller, H.

Lupton, J. M.

Feldmann, J.

机构：

[1] Univ Munich, Dept Phys, Photon & Optoelect Grp, D-80799 Munich, Germany

[2] Univ Munich, CeNS, D-80799 Munich, Germany

[3] Univ Hamburg, Inst Phys Chem, D-20146 Hamburg, Germany

[4] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.98.017401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The excited state of colloidal nanoheterostructures consisting of a spherical CdSe nanocrystal with an epitaxially attached CdS rod can be perturbed effectively by electric fields. Field-induced fluorescence quenching coincides with a conversion of the excited state species from the bright exciton to a metastable trapped state (dark exciton) characterized by a power-law luminescence decay. The conversion is reversible so that up to 10% of quenched excitons recombine radiatively post turn-off of a 1 mu s field pulse, increasing the delayed luminescence by a factor of 80. Excitons can be stored for up to 10(5) times the natural lifetime, opening up applications in optical memory elements.

引用

页数：4

共 29 条

[1] Semiconductor clusters, nanocrystals, and quantum dots [J].