A study of electric field dependent spectra and the quantum
electroluminescence yield of single-layer (SL) and double-layer (DL)
light-emitting diodes (LEDs) based on a combination of an aromatic diamine
(TPD) and an oxadiazole derivative (PBD) was carried out. It was shown that a
high electric field weakens the recombination of Coulombically
correlated electron-hole pairs in the bulk (SL LEDs) and enhances the
process at the TPD-doped polymer/PBD interface (DL LEDs). The effects are
discussed in terms of electric field mediated interplay between populations of
localized (monomolecular) excitons, exciplexes and electroplexes in conjuction
with their local environments.
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