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  • 02월 20일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제113회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Deep-Blue Phosphorescence from Perfluoro Carbonyl-Substituted Iridium Complexes

2014년 3월 10일 14시 51분 42초
KCS4-2 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 10시 : 25분
한국다우케미칼 어워드 수상자 구두발표
저자 및
이성훈, 김슬옹1, 신현, 윤희준1, 양기열2, 권순기1,*, 김윤희3,*, 김장주*
서울대학교 재료공학부, Korea
1경상대학교 재료공학부, Korea
2경상대학교 화학교육과, Korea
3경상대학교 화학과, Korea
The new deep-blue iridium(III) complexes, (TF)2Ir(pic), (TF)2Ir(fptz), (HF)2Ir(pic) and (HF)2Ir(fptz), consisted of 2’,4’’-difluororphenyl-3-methylpyridine with trifluoromethyl carbonyl or heptafluoropropyl carbonyl at the 3’ position as the main ligand and a picolinate or a trifluoromethylated-triazole as the ancillary ligand, were synthesized and characterized for applications in organic light-emitting diodes (OLEDs). Density function theory (DFT) calculations showed that these iridium complexes had a wide band gap, owing to the introduction of the strong electron withdrawing perfluoro carbonyl group. Time dependent DFT (TD-DFT) calculations suggested that their lowest triplet excited state was dominated by a HOMO → LUMO transition and that the contribution of the metal-to-ligand charge transfer (MLCT) was higher than 34% for all four complexes, indicating that strong spin-orbit coupling exists in the complexes. The 10 wt% (TF)2Ir(pic) doped 9-(3-(9 H -carbazole-9-yl)phenyl)-3-(dibromophenylphosphoryl)-9 H -carbazole (mCPPO1) film exhibited the highest photoluminescence quantum yield 74 ± 3% among the films based on the four complexes. Phosphorescent OLEDs based on (TF)2Ir(pic) and (TF)2Ir(fptz) exhibited maximum external quantum efficiencies of 17.1% and 8.4% and Commission Internationale de l’Eclairage (CIE) coordinates of (0.141, 0.158) and (0.147, 0.116), respectively. These CIE coordinates represent some of the deepest blue emissions ever achieved from phosphorescent OLEDs with considerably high EQEs.