Accession Number : ADA330215

Title :   Novel Light-Emitting Devices Based on Pyridine-Containing Conjugated Polymers

Descriptive Note : Technical rept.

Corporate Author : OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS

Personal Author(s) : Wang, Y. Z. ; Gebler, D. D. ; Fu, D. K. ; Swager, T. M. ; MacDiarmid, A. G.

PDF Url : ADA330215

Report Date : 20 SEP 1997

Pagination or Media Count : 21

Abstract : We present novel light-emitting devices based on several pyridine-containing conjugated polymers and copolymers in various device configurations. The high electron affinity of pyridine-based polymers improves stability and electron transport properties of the polymers and enables the use of relatively stable metal such as AL as electron injecting contacts. Bilayer devices utilizing poly (9-vinyl carbazole) (PVK) as hole transporting/electron blocking polymer show dramatically improved efficiency and brightness as compared to single layer devices, which is attributed to charge confinement and exciplex emission at the PVK/emitting polymer interface. The incorporation of conducting polyaniline network electrode top PVK reduces the device turn-on voltage significantly while maintaining the high efficiency. Novel device configurations such as inverted light-emitting devices and symmetrically configured AC light-emitting (SCALE) devices enable the use of ITO as electron injecting contact, eliminating the use of low workfunction metals as electrodes, potentially improving the device operating stability and shelf lifetime.

Descriptors :   *ELECTROLUMINESCENCE, *ANILINES, STABILITY, ELECTRON TRANSPORT, COPOLYMERS, QUANTUM EFFICIENCY, PYRIDINES, PHASE CONJUGATION.

Subject Categories : Electrooptical and Optoelectronic Devices
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE