Measurement of the exciton diffusion length in discotic columnar liquid crystals: Comparison between homeotropically oriented and non-oriented samples

被引：23

作者：

Cisse, Lamine ^{[2
]}

Destruel, Pierre ^{[2
]}

Archambeau, Samuel ^{[2
]}

Seguy, Isabelle ^{[2
]}

Jolinat, Pascale ^{[2
]}

Bock, Harald ^{[1
]}

Grelet, Eric ^{[1
]}

机构：

[1] Univ Bordeaux, CNRS, Ctr Rech Paul Pascal, F-33600 Pessac, France

[2] Univ Toulouse, UPS, CNRS, INP,Lab Plasma & Convers Energie, F-31062 Toulouse 9, France

来源：

CHEMICAL PHYSICS LETTERS | 2009年 / 476卷 / 1-3期

关键词：

ENERGY-TRANSFER; FILMS;

D O I：

10.1016/j.cplett.2009.06.028

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：

This Letter reports the determination of the singlet exciton diffusion length (L-D) for a thermotropic discotic columnar liquid crystal (CLC) in both non-oriented and homeotropically oriented (columns perpendicular to the substrate) samples. Experimental results based on photoluminescence measurements indicate that L-D is only slightly dependent on the liquid crystal orientation. Conversely, studies of ITO/CLC (50 nm)/Al Schottky-type devices formed by non-oriented and oriented liquid-crystalline films show an increase in the photocurrent by a factor of 16, due to the homeotropic alignment. This improvement is attributed to both increased light absorption and charge-carrier mobility. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：89 / 91

页数：3