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We present a comprehensive model to analyze, quantitatively, and predict theprocess of degradation of organic light-emitting diodes (OLEDs) considering allpossible degradation mechanisms, i.e., polaron, exciton, exciton-polaroninteractions, exciton-exciton interactions, and a newly proposed impurityeffect. The loss of efficiency during degradation is presented as a function ofquencher density, the density and generation mechanisms of which were extractedusing a voltage rise model. The comprehensive model was applied to stable bluephosphorescent OLEDs (PhOLEDs), and the results showed that the model describedthe voltage rise and external quantum efficiency (EQE) loss very well, and thatthe quenchers in emitting layer (EML) were mainly generated by dopant polarons.Quencher formation was confirmed from a mass spectrometry. The polaron densityper dopant molecule in EML was reduced by controlling the emitter doping ratio,resulting in the highest reported LT50 of 431 hours at an initial brightness of500 cd/m2 with CIEy<0.25 and high external quantum efficiency (EQE) >18%.

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A Comprehensive Model of the Degradation of Organic Light-Emitting  Diodes and Application for Efficient Stable Blue Phosphorescent Devices with  Reduced Influence of Polarons