P‐134: Synthesis of Host Material for Blue Phosphorescent Organic Light‐Emitting Diodes Derived From Bicarbazole Backbone Structure. Issue 1 (June 2015) - Yoo, Seung Gun
Abstract : 4, 4′‐(9, 9′‐[2, 3′‐bicarbazole]‐9, 9′‐diyl) bis(N, N‐di‐p‐tolylaniline) (44BBDT) was synthesized between 9H, 9′H‐2, 3′‐bicarbazole and 4‐bromo‐N, N‐di‐p‐tolylaniline as a host material in blue phosphorescent organic light emitting diodes (PHOLEDs). This material showed high triplet energy above 2.78 eV. The highest occupied molecular orbital and lowest unoccupied molecular orbital were ‐5.76 eV and ‐2.47 eV, respectively. The 44BBDT was applied as the host material of the blue triplet emitter derived from phenylimidazole ligand and the 44BBDT device showed maximum external quantum efficiency of 17.8% with low driving voltage.