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P‐134: Synthesis of Host Material for Blue Phosphorescent Organic Light‐Emitting Diodes Derived From Bicarbazole Backbone Structure
Author(s) -
Yoo Seung Gun,
Hwang Seok Ho,
Lee Jun Yeob
Publication year - 2015
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.10154
Subject(s) - phosphorescence , oled , homo/lumo , common emitter , phosphorescent organic light emitting diode , diode , quantum efficiency , materials science , optoelectronics , photochemistry , chemistry , molecule , fluorescence , nanotechnology , optics , physics , organic chemistry , layer (electronics)
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.