High-Performance Blue Molecular Emitter-Free and Doping-Free Hybrid White Organic Light-Emitting Diodes: an Alternative Concept To Manipulate Charges and Excitons Based on Exciplex and Electroplex Emission

Abstract

For the first time, hybrid white organic light-emitting diodes (WOLEDs) have been developed via the manipulation of exciplex and electroplex emission. Unlike previous hybrid WOLEDs, this novel kind of hybrid WOLED is exciplex/electroplex based hybrid WOLEDs. First, an exciplex/electroplex system is explored, exhibiting the best performance among WOLEDs with emissions generated from exciplex/electroplex systems. Then, with doping-free technology, the single-molecular-emitter WOLED exhibits maximum total external quantum efficiency (EQE) and power efficiency (PE) of 16.8% and 56.4 lm W–1, respectively, the highest among doping-free hybrid WOLEDs. Besides, PE at 1000 cd m–2 (40.0 lm W–1) is higher/efficiency roll-off is lower than some best doping hybrid WOLEDs. The two-molecular-emitter WOLED exhibits (i) a CRI of 92.1, the highest among doping-free WOLEDs (DF-WOLEDs); (ii) a correlated color temperature of 2319 K, the lowest among DF-WOLEDs; and (iii) 2-fold higher efficiency (28.2 lm W–1) than the best DF...