Novel light-emitting devices based on pyridine-containing conjugated polymers.

TitleNovel light-emitting devices based on pyridine-containing conjugated polymers.
Publication TypeJournal Article
Year of Publication1997
AuthorsWang, YZ, Gebler, DD, Spry, DJ, Fu, DK, Swager, TM, Macdiarmid, AG, Epstein, AJ
JournalIEEE Transactions on Electron Devices
Keywordspolyvinylcarbazole light emitting device, pyridine conjugated polymer light emitting device

The authors present novel light-emitting devices based on several pyridine-contg. 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. [on SciFinder(R)]