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The operational lifetime of exciplex-based phosphorescent OLEDs is closely determined by the singlet energy level difference between hole-transporting and electron-transporting hosts, and the difference between singlet and triplet energy levels in the exciplex. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

September 14, 2017Scientific Reports68 citationsOpen Access

The Role of Charge Balance and Excited State Levels on Device Performance of Exciplex-based Phosphorescent Organic Light Emitting Diodes

SLSangyeob LeeHanbat National University HKHyun Cheol KooKorea University OKOhyun KwonSamsung (South Korea)

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Abstract

: time after 5% decrease of luminance) are achieved which is one of the best performance in OLEDs. Systematic approach, controlling mixing ratio of HT to ET host materials is suggested to select the component of two host system using energy band matching and charge balance optimization method. Furthermore, our analysis on exciton stability also reveal that lifetime of OLEDs have close relationship with two parameters; singlet energy level difference of HT and ET host and difference of singlet and triplet energy level in exciplex.

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