Highly Efficient Green Homoleptic Ir(III) Complexes Approaching 21% of EQE by Solution-processed for Green PHOLEDs with Higher Efficiency
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초록
내용
Over the last few years, phosphorescent organic light emitting diodes (PHOLEDs) have been improved on the application of next-generation flat-panel displays, because of strong spin-orbit coupling, complexes with transition heavy metals as like Ir(III) complexes. In this study, two homoleptic iridium(III) complexes were designed and synthesized. Their thermal, photophysical, electrochemical, and electroluminescence characteristics were fully characterized. Both complexes exhibited featureless emission spectra with the maximum photoluminescence at 529 and 513 nm with high photoluminescence quantum yields of 88% and 85%. Notably, electron transport layer optimized devices using mer-MECF as a dopant exhibited maximum external quantum efficiency of 18.6% and 21.1% and a maximum current efficiency of 62.4 and 71.4 cd A-1. The introduction of different functional groups an effective approach to molecular designing Ir(III) complexes for high quality green solution-process PHOLEDs.