Exciplex emission from electroluminescent ladder-type pentaphenylene oligomers bearing both electron- and hole-accepting substituents

被引：13

作者：

Finlayson, Chris E. ^{[1
]}

Kim, Ji-Seon ^{[1
]}

Liddell, Matthew J. ^{[1
]}

Friend, Richard H. ^{[1
]}

Jung, Sung-Hyun ^{[2
]}

Grimsdale, Andrew C. ^{[2
]}

Muellen, Klaus ^{[2
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[2] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

JOURNAL OF CHEMICAL PHYSICS | 2008年 / 128卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1063/1.2813351

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：

We examine the photophysical properties of ladder-type pentaphenylenes, which have been prepared as prototypical "all-in-one" emissive materials bearing both electron-accepting (diaryloxadiazole) and electron-donating (triphenylamine) units. We find that donor-acceptor interactions are very dependent on the nature of the connectivity of these groups to the main pentaphenylene chain. When the oxadiazole and triphenylamine units were substituted on opposite sides of the pi-conjugated pentaphenylene chromophore, photoluminescence with long lifetimes typical of exciplex-like species was observed, while being significantly quenched by intermolecular charge separation between the substituents. By contrast, when the triphenylamine units were attached at the ends of the chromophore, no such effects were observed and a blue/green photoluminescence was obtained with very high quantum efficiency. In this latter configuration, evidence of ambipolar charge transport and a blue/green electroluminescence were additionally observed. (C) 2008 American Institute of Physics.

引用

页数：10

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