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Issue 46, 2006
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Efficient blue light-emitting diodes based on a classical “push–pull” architecture molecule 4,4′-di-(2-(2,5-dimethoxyphenyl)ethenyl)-2,2′-bipyridine

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Abstract

A novel, highly blue luminescent molecule containing donor and acceptor groups, 4,4′-di-(2-(2,5-dimethoxyphenyl)ethenyl)-2,2′-bipyridine, that shows photoluminescence emission at 450 nm with 43% quantum yield is designed and synthesized. Time dependent-DFT calculations show an excellent correlation between theoretical and experimental absorption spectra, thus allowing for a detailed description of the electronic structure and assignment of the main absorption features. An optimized organic light-emitting diode based on a 4,4′-di-(2-(2,5-dimethoxyphenyl)ethenyl)-2,2′-bipyridine blue emitting layer, with a 4,4′,4″-tris(carbazol-9-yl)-triphenylamine) hole transporting layer, a 2,9-dimethyl-4.7-diphenyl-phenatroline hole blocking layer, and a tris(8-hydroxyquinoline)aluminium electron transport layer exhibited 2.1% quantum efficiency.

Graphical abstract: Efficient blue light-emitting diodes based on a classical “push–pull” architecture molecule 4,4′-di-(2-(2,5-dimethoxyphenyl)ethenyl)-2,2′-bipyridine

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Supplementary files

Article information


Submitted
31 Jul 2006
Accepted
07 Sep 2006
First published
28 Sep 2006

J. Mater. Chem., 2006,16, 4468-4474
Article type
Paper

Efficient blue light-emitting diodes based on a classical “push–pull” architecture molecule 4,4′-di-(2-(2,5-dimethoxyphenyl)ethenyl)-2,2′-bipyridine

D. Berner, C. Klein, Md. K. Nazeeruddin, F. De Angelis, M. Castellani, Ph. Bugnon, R. Scopelliti, L. Zuppiroli and M. Graetzel, J. Mater. Chem., 2006, 16, 4468
DOI: 10.1039/B610880F

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