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Tetraphenylmethane-Based 1,3,4-Oxadiazole as Electron Transporting Materials in Organic Light-Emitting Devices

Published online by Cambridge University Press:  21 March 2011

Chin-Ti Chen ,
Tzu-Yao J. Lin ,
Hsiu-Chih Yeh ,
Li-Hsin Jan ,
Easwaramoorthy Balasubramaniam  and
Yu-Tai Tao
Chin-Ti Chen
Affiliation:
Institute of Chemistry, Academia Sinica, Taipei, Taiwan 11529, cchen@chem.sinica.edu.tw
Tzu-Yao J. Lin
Affiliation:
Institute of Chemistry, Academia Sinica, Taipei, Taiwan 11529
Hsiu-Chih Yeh
Affiliation:
Institute of Chemistry, Academia Sinica, Taipei, Taiwan 11529
Li-Hsin Jan
Affiliation:
Institute of Chemistry, Academia Sinica, Taipei, Taiwan 11529
Easwaramoorthy Balasubramaniam
Affiliation:
Institute of Chemistry, Academia Sinica, Taipei, Taiwan 11529
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Abstract

A series of tetrahedral tetramers of 2,5-diphenyl substituted 1,3,4-oxadiazole compounds were synthesized and characterized for electron-transporting layer (ETL) in organic light-emitting diode (OLED). The multiple-branch design of the oxadiazole tetramers intends to increase the melting temperature and to generate glass phase of the low molar mass derivative such as 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD). We observed temperatures of the glass phase transition for the oxadiazole tetramer with appropriate peripheral substituents, indicative of amorphous characteristics of the molecule in spite of highly symmetrical molecular framework. The luminescence-current-voltage characteristics of multilayer OLED devices containing the oxadiazole tetramer or PBD as ETL were examined to evaluate the efficiency of our multiple-branch molecular design.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 598: Symposium BB – Electrical, Optical, & Magenetic Properties...V , 1999 , BB3.5
Copyright
Copyright © Materials Research Society 1999

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