| 학회 | 한국공업화학회 |
| 학술대회 | 2022년 봄 (05/11 ~ 05/13, 제주국제컨벤션센터(ICC JEJU)) |
| 권호 | 26권 1호 |
| 발표분야 | 포스터-디스플레이 |
| 제목 | Influence for structural change of bulky substituent in the photoinduced electron transfer of blue emissive homoleptic NHC-Ir(III) complexes |
| 초록 | The phosphorescence properties of fac-/mer-Ir(pmp)3 and fac-/mer-Ir(dmpmp)3 (pmp = 3-methyl-1-phenyl-2,3-dihydro-1H-imidazo[4,5-b]pyridine and dmpmp = 1-(2',6'-dimethylbiphenyl-2-yl)-3-methyl-2,3-dihydro-1H-imidazo[4,5-b]pyridine) were investigated. To confirm thelarge differences between Ir(pmp)3and Ir(dmpmp)3, we performed femtosecond time-resolved transientabsorption (TA) spectroscopic measurements. The TA spectra of Ir(dmpmp)3were almost the same as those of Ir(pmp)3 at a short delay time. Whereas, Ir(dmpmp)3 showed a new broad TA band at around 720 nm withincreasing delay time. The rise time of this band was ca. 10 ps for bothisomers, and this may be attributed to the geometrical change in the excitedstate, which is associated with the steric effect of the bulky substituent. Actually, Ir(dmpmp)3 showed a rigidochromic shift in the emission spectra with varying temperature, and structural displacement takes place accompanied by the fast migration of ILCT. |
| 저자 | 김소연, 윤보선, 강상욱, 손호진 |
| 소속 | 고려대 |
| 키워드 | photoinduced electron transfer; ILCT; bulky substituent; blue emitter; |
