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.
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