신소재공학과 WCU Flexible Signage사업단에서 아래와 같이 세미나를 개최하오니
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▪ 일 시 : 2011년 5월 12일(목) 오후 4시
▪ 장 소 : 신소재공학과 2425호 강의실 (응용공학동 2층)
▪ 제 목 : Search for New Blue Phosphorescent Iridium Complexes for OLED
▪ 연 사 : 윤웅찬 교수 (부산대 화학과)
Search for New Blue Phosphorescent Iridium Complexes for OLED
Ung Chan Yoon*
(Department of Chemistry and Chemistry Institutes of Functional Materials, Pusan National University)
Recently we have conducted investigations to develop novel highly efficient deep blue phosphorescent ( at ~440 nm) iridium complexes which might be useful for full color OLED displays and efficient WOLEDs. Iridium complexes attract continous attention as emitting-dopant materials for OLEDs because of their phosphorescence emssion of high quantum efficiency.
Based on the earlier reports1 and observations, we deigned new iridium complexes which contain 2-(2,4-difluorophenyl)-4-methylpyridine, 2-(2,4-difluoro-3-trifluoromethylphenyl)-4-methylpyridine, and 2-(2,4-difluorophenyl)-2-N,N- dimethyl-aminopyridine as main ligands, and the new substituted 2-pyridyltriazolate derivatives, imidazole carboxylates of low HOMO and high LUMO energy level 2 as ancillary ligands. The main ligands and the new ancillary ligands were prepared following a modified method of the reported.1,3 The biscyclometalated Ir complexes of the main ligands were prepared by a conventional two-step reaction via m-chloro-bridged dimer. Utilizing the synthesized five biscyclometalated Ir complexes and eight ancillary ligands new blue-emitting heteroleptic Iridium (III) complexes were synthesized.
Their structures were fully characterized by spectroscopy and single crystal x-ray diffraction. Their UV-vis absorption and emission spectra, electrochemical properties, and phosphorescent quantum yields were measured. In the lecture will be discussed our successful efforts to develop new deep blue phosphorescent iridium complexes mainly through structural modification of their ancillary lignds.
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