Accession Number : ADA338061

Title :   Control of Light-Emitting Polymer Devices Using Polymer/Polymer Interfaces.

Descriptive Note : Technical rept.

Corporate Author : OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS

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

PDF Url : ADA338061

Report Date : 06 FEB 1998

Pagination or Media Count : 13

Abstract : We present the use of polymer/polymer interfaces to control light-emitting polymer devices. Bilayer devices utilizing poly (9-vinyl carbazole) (PVK) as a hole transporting/electroll blocking polymer together with a pyridine containing electron transporting layer show dramatically improved efficiency and brightness as compared to single layer devices. This is attributed to charge confinement and exciplex emission at the PYK/emitting polymer interface. The in trod uction ot emeraldine base (EB) form of polyaniline (PAN) on both sides of the emitting layer enables the deviu' to work undor both forward and reverse bias, as well as in AC modes. Interfaces play an important role) in the operation of these devices. Furthermore, when the EB is replaced by sulfonated polyaniline (SPAN) on the cathode side and the emitting layer is properly modified to balance electron and hole transport, the device generates different colors of light, red under forward bias and green under reverse bias.

Descriptors :   *POLYMERS, *HOLES(ELECTRON DEFICIENCIES), *LIGHT EMITTING DIODES, EMISSION, FORWARD AREAS, CONTROL SYSTEMS, INTERFACES, EXPLOSIVE CHARGES, ALTERNATING CURRENT, TRANSPORT PROPERTIES, ELECTRONS, CATHODES, COLORS, BALANCE, SULFONATES, CONFINEMENT(GENERAL), BLOCKING, BIAS, ANILINES.

Subject Categories : Polymer Chemistry
      Electrical and Electronic Equipment
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE