CdSe:Te nanocrystals:: Band-edge versus Te-related emission

被引：39

作者：

Franzl, Thomas

Mueller, Josef

Klar, Thomas A.

Rogach, Andrey L. ^{[1
]}

Feldmann, Jochen

Talapin, Dmitri V.

Weller, Horst

机构：

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

[2] Univ Munich, Ctr Nanosci, D-80799 Munich, Germany

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

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 07期

关键词：

D O I：

10.1021/jp067166s

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Strongly luminescent monodisperse CdSe nanocrystals in which a few Se atoms are substituted with Te atoms (CdSe:Te) provide a model system for studies of both band-edge and trap-related luminescence. Ensemble photoluminescence spectra of CdSe:Te nanocrystals are asymmetrically broadened and red-shifted in comparison to bare CdSe nanoparticles. Single particle luminescence measurements show that the bare CdSe and the CdSe:Te nanocrystals emit at distinctly different wavelengths and differ in line shape and line width. Individual CdSe:Te nanocrystals show two kinds of emission spectra, which have been ascribed by us to particles with one Te and with a few Te atoms per nanocrystal. Single particle measurements furthermore show that a single CdSe:Te nanocrystal can emit either from the band-edge states or from trap state(s) created by the Te atom(s), but not from both.

引用

页码：2974 / 2979

页数：6

共 30 条

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