Title :
Novel light-emitting devices based on pyridine-containing conjugated polymers
Author :
Wang, Yunzhang Z. ; Gebler, Darren D. ; Spry, David J. ; Fu, Dan K. ; Swager, Timothy M. ; MacDiamid, A.G. ; Epstein, Arthur J.
Author_Institution :
Dept. of Phys., Ohio State Univ., Columbus, OH, USA
fDate :
8/1/1997 12:00:00 AM
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 metals such as Al as electron injecting contacts. Bilayer devices utilizing poly(9-vinyl carbazole) (PVK) as a hole-transporting/electron-blocking polymer show dramatically improved efficiency and brightness as compared to single layer devices. This is attributed to charge confinement and exciplex emission at the PVK/emitting polymer interface. The incorporation of conducting polyaniline network electrode into PVK reduces the device turn-on voltage significantly while maintaining the high efficiency. Two novel device configurations that enable the use of high work function metals as electrodes are pointed out
Keywords :
electroluminescent devices; electron affinity; photoluminescence; polymer blends; polymer films; stability; Al; Al electron injecting contacts; PVK/emitting polymer interface; bilayer devices; brightness; charge confinement; conducting polyaniline network electrode; copolymers; device turn-on voltage reduction; efficiency; electron affinity; electron transport properties; exciplex emission; high work function metal electrodes; hole-transporting/electron-blocking polymer; light-emitting devices; poly(9-vinyl carbazole); pyridine-containing conjugated polymers; stability; Cathodes; Chemistry; Displays; Electrodes; Electroluminescence; Electrons; Oxidation; Physics; Polymers; Stability;
Journal_Title :
Electron Devices, IEEE Transactions on
