Surface passivation in CdSe nanocrystal-polymer films revealed by ultrafast excitation relaxation dynamics

被引：17

作者：

Kovalevskij, V

Gulbinas, V

Piskarskas, A

Hines, MA

Scholes, GD

机构：

[1] Inst Phys, LT-2053 Vilnius, Lithuania

[2] Vilnius State Univ, LT-2040 Vilnius, Lithuania

[3] Univ Toronto, Dept Chem, Toronto, ON M5S 3H6, Canada

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2004年 / 241卷 / 08期

关键词：

D O I：

10.1002/pssb.200402035

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The photoluminescence efficiencies and excitation relaxation dynamics in CdSe nanocrystals (NC) passivated with tri-n-octylphosphine oxide and embedded in two different polymer matrixes, poly(styrene) (PS) and poly(butylmethacrylate) (PBMA), are compared. Femtosecond pump-probe absorption spectroscopy is used to clarify the influence of various transparent polymer matrixes on the electronic properties and excitation relaxation dynamics of quantum confined CdSe semiconductor nanocrystals of 5.0 nm diameter. The fluorescence intensity is reported to be similar to10 times higher for the NC-PS sample compared to the NC-PBMA film. This striking difference in fluorescence yield is shown to be related to markedly different rates of nonradiative excitation relaxation in the two samples, and is attributed directly to a role played by the polymer host. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

引用

页码：1986 / 1993

页数：8

共 23 条

[11] Ultrafast carrier dynamics in semiconductor quantum dots [J].