|
Type |
Poster Presentation |
Area |
Industrial Chemistry |
Room No. |
Event Hall |
Time |
4월 19일 (목요일) 11:00~12:30 |
Code |
IND.P-14 |
Subject |
Photophysical Properties of Isomeric N-heterocyclic Carbene Ir (III) Complexes and Its Application to Blue Phosphorescent OLEDs |
Authors |
So-Yoen Kim, Jin-Hyoung Kim, JEONG WAN YU, Chul Hoon Kim, Sang Ook Kang, Ho-Jin Son* Department of Advanced Materials Chemistry, Korea University, Korea |
Abstract |
Two isomeric N-heterocyclic carbene Ir(III) complexes, f-Ir-(dbfmi)3 and m-Ir-(dbfmi)3, were isolated and their systematic investigation on photophysical and electrochemical properties was carried out. Among them, the crystal structure of the meridional isomer, m-Ir-(dbfmi)3, is determined. The origin of phosphorescent emissions differs depending on the configurations of the two isomers. Both isomers, f-Ir-(dbfmi)3 and m-Ir-(dbfmi)3, showed efficient emission in dichloromethane solution with quantum yields of 68% and 53%, respectively, due to unusual properties of the N-heterocyclic carbene (NHC) ligand; –that is, the complexes possess a strong metal–ligand bond that destabilizes the non-radiative metal centred ligand-field states. Depending on their configurations, the two isomers showed slightly different excited states. Even though both isomers possess a largely 3LC character mixed with the 3MLCT character in their excited states, m-Ir-(dbfmi)3 showed higher 3MLCT character as evidenced by the solvent polarity dependence emission spectra and emission lifetime. |
E-mail |
yjwo1219@naver.com |
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