Cyanopyridine Based Bipolar Host Materials for Green Electrophosphorescence with Extremely Low Turn-On Voltages and High Power Efficiencies
Quantum Efficiency
HOMO/LUMO
Electrical efficiency
DOI:
10.1021/acsami.6b04395
Publication Date:
2016-08-01T18:36:47Z
AUTHORS (5)
ABSTRACT
Low driving voltage and high power efficiency are basic requirements when practical applications of organic light emitting diodes (OLEDs) in displays lighting considered. Two novel host materials m-PyCNmCP 3-PyCNmCP incorporating cyanopyridine moiety as electron-transporting unit developed for use fac-tris(2-phenylpyridine)iridium(III) (Ir(ppy)3) based green phosphorescent OLEDs (PhOLEDs). Extremely low turn-on voltages 2.01 2.27 V realized, which even lower than the theoretical limit emitted photon energy (hv)/electron charge (e) (2.37 V) Ir(ppy)3. High 101.4 lm/W (corresponding to a maximum external quantum 18.4%) 119.3 (24.7%) achieved PhOLEDs. The excellent EL performance benefits from ideal parameters by combining cyano pyridine enhance n-type feature. energetic favorable alignment HOMO/LUMO levels hosts with adjacent layers dopant easy injections direct trapping dopant, their bipolar feature balance transportations, sufficiently triplet small singlet/triplet difference (0.38 0.43 eV) combine be responsible extremely efficiencies
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