Accession Number : ADA330192

Title :   Pyridine-Based Conjugated Polymers: Photophysical Properties and Light- Emitting Diodes

Descriptive Note : Technical rept.

Corporate Author : OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS

Personal Author(s) : Epstein, A. J. ; Wang, Y. Z. ; Jessen, S. W. ; Blatchford, J. W. ; Gebler, D. D.

PDF Url : ADA330192

Report Date : 20 SEP 1997

Pagination or Media Count : 14

Abstract : We study the photophysical properties of the pyridine-based polymers poly (p-pyridyl vinylene) (PPyV) and poly (p-pyridine) (PPy). The primary photoexcitations in the pyridine-based polymers are singlet excitons. We observe direct intersystem crossing (ISC) on picosecond timescales with the volume density of triplet excitons varying with the sample morphology (film or powder). These effects are demonstrated clearly by examining the millisecond photoinduced absorption characteristics of powder and film forms of PPyV. The pyridine-based polymers have been shown to be promising candidates for polymer light-emitting devices both the 'conventional ' diode device and symmetrically configured ac light-emitting (SCALE) device. Here we examine the role of 'insulating' layers and their interfaces with the emitting layer and electrodes in the SCALE device operation with emphasis on the central role of the polymer-polymer interfaces.

Descriptors :   *ELECTROLUMINESCENCE, PHYSICAL PROPERTIES, POLYMERS, ELECTRODES, PYRIDINES, LIGHT EMITTING DIODES, EXCITONS, PHASE CONJUGATION.

Subject Categories : Electrooptical and Optoelectronic Devices
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE