| 학회 |
한국고분자학회 |
| 학술대회 |
2019년 가을 (10/09 ~ 10/11, 제주컨벤션센터) |
| 권호 |
44권 2호 |
| 발표분야 |
분자전자 부문위원회 II |
| 제목 |
Deep blue phosphorescence with high quantum efficiency engaging trifluoromethylsulfonyl group to iridium phenyl pyridine complexes |
| 초록 |
Incorporation of an electron-withdrawing -SO2CF3 (σp = 0.96) substituent in cyclometalating C^N-phenyl pyridine (ppy) ligand resulted in an expected blue-shifted phosphorescence derived from homoleptic Ir(C^N)3 complexes [λem = 457 nm for Ir(ppySCF3)3 at 77 K]. Its heteroleptic counterpart, modified by a pyrazolyl borate LX ligand, Ir(ppySCF3)2(bor) exhibited further blue-shifted phosphorescence (λem = 455 nm at 77 K). Density-functional theory (DFT) calculations supported the efficacy of electron-withdrawing capability of the SO2CF3 substituent lowering HOMO energy and obtained a widened band-gap and resumed a deep blue emission. Stronger σ-bond of CPh-Ir correlates well to a higher emission quantum yield of Ir(ppySCF3)3 than that of Ir(ppySF)3, the reported fluoro sulfonyl (-SO2F) derivative which is devoid of a 3MC deactivation manifold resulting in the quantum yields (ФPL) of Ir(ppySCF3)3 and Ir(ppySF)3 to be 0.89 and 0.72, respectively. |
| 저자 |
나수원, 백창현, 이대한, 조대원, 강상욱, 손호진
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| 소속 |
고려대 |
| 키워드 |
Ir complex; Irppy; Ir dopant; blue dopant; OLED
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| E-Mail |
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