Evidence of intermolecular species formation with electrical aging in anthracene-based blue organic light-emitting devices

摘要: Electrical aging mechanism in blue emitting organic light-emitting devices (OLEDs) based on 9,10-bis (2-naphthyl)-2-t-butyl anthracene (TBADN) fluorescent emitter is investigated using a number of techniques, including delayed electroluminescence measurements. The studies reveal that electrical associated with an increasing concentration intermolecular species weak characteristic luminescence at around 535 nm. This capable charge trapping, and thus plays role as electron-hole recombination center prolonged driving. Weak green from this leads to increased green/blue emission ratio, causes the color purity loss aged devices. results also suggest efficient dissipating excitation energy nonradiatively, hence quenching TBADN singlet excitons, contributing observed efficiency aging.