Abstract
Electric field modulated absorption (EA) spectra were measured in vacuum evaporated films of bathocuproine (BCP), the phenanthroline derivative commonly used in organic light emitting diodes. The EA spectra are interpreted in terms of the standard Stark spectroscopy analysis using a comparison of the EA spectrum with first and second absorption derivatives. The dipole moment and polarizability changes upon photoexcitation were calculated for the lowest energy singlet excited states in BCP films. The excited states are recognized as Frenkel excitons carrying intramolecular charge transfer (CT) character. Full text: PDF
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