| 초록 |
In this study, we synthesized deep blue phosphorescence host materials based on carbazole to obtain high triplet energy and high hole transport properties. The electron withdrawing diphenylphosphine oxide units were introducing onto 3,6-position of 9H-carbazole and 6-position of 9-ethyl-9H-carbazole to observe changes of thermal, photophysical, and electrochemical properties. Synthesized host materials doped with FCNIrpic were used as an emitting layer for the deep blue phosphorescence OLEDs (PHOLEDs) fabricated by a typical solution process. All host materials showed high triplet energy over 2.94 eV and maximum quantum efficiency of bis-CMPC was 12.1 %. Bis-CPO1 and bis-CPO2 introduced diphenylphosphine oxide showed low current density and quantum efficiency because hole transport property from hole tranport layer to emitting layer and hole mobility were decreased. The CIE color coordinate of bis-CMPC, bis-CPO1 and bis-CPO2 were (0.14, 0.19), (0.14, 0.20) and (0.14, 0.21). |
