RECENT PROGRESS IN POLYMERS FOR ELECTROLUMINESCENCE - MICROCAVITY DEVICES AND ELECTRON-TRANSPORT POLYMERS

In this paper we briefly review the status of polymer electroluminesce nce and then report recent work on microcavity polymer devices and on electron transport polymers with electron-deficient nitrogen-containin g aromatic moieties. Results are presented for electroluminescence and photoluminescence from microcavity structures containing a poly(2,5-d ialkoxy-p-phenylene vinylene) conjugated polymer. Strong spectral narr owing from 108 nm full width half maximum to 34 nm in electroluminesce nce and from 128 nm to 16 nm in photoluminescence, marked enhancement of the peak emission intensity and clear angular dependence of the pea k emission wavelength are observed. These are all characteristic signa tures of the modification of spontaneous emission properties in microc avity structures and open the way to studies of microcavity physics in polymer based devices. A non-ether poly(phenyl quinoxaline) and poly( 2,6-pyridine vinylene-co-2,5-diheptoxy-p-phenylene vinylene) have been investigated as new electron transport polymers and we present result s for their operation in both single and bilayer polymer devices. Addi tional target polymers for electron transport functionality are descri bed.