Use of poly(phenyl quinoxaline) as an electron transport material in polymer light-emitting diodes

D. O'Brien, M. S. Weaver, D. G. Lidzey, D. D.C. Bradley

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Abstract

We report the use of a poly(phenyl quinoxaline) (PPQ) as an electron transporting conjugated polymer for electroluminescence (EL) applications. Single-layer PPQ devices with ITO anode and aluminium cathode show unipolar electron transport with current densities up to 60 mA/cm2 but no emission. Two-layer structures combining PPQ as electron transport material with the hole transporting poly(2,5-dialkoxy-p-phenylene vinylene) (PDAOPV) show strong emission from the PDAOPV with brightnesses up to 250 cd/m2. These two-layer structures have a maximum EL quantum efficiency of 0.35% which is ten-fold enhanced compared with the corresponding single-layer PDAOPV devices. © 1996 American Institute of Physics.
Original languageEnglish (US)
JournalApplied Physics Letters
Volume69
Issue number7
DOIs
StatePublished - Aug 12 1996
Externally publishedYes

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