| 학회 |
한국고분자학회 |
| 학술대회 |
2018년 가을 (10/10 ~ 10/12, 경주컨벤션센터) |
| 권호 |
43권 2호 |
| 발표분야 |
분자전자 부문위원회 II |
| 제목 |
Comprehensive spectroscopic studies of cis and trans isomers of red-phosphorescent heteroleptic iridium(III) complexes |
| 초록 |
We have synthesized heteroleptic Ir(III) complexes showing red phosphorescence, which can be separated as two geometrical isomers. Each isomer showed different absorption and emission spectral behaviours. The phosphorescence of the cis isomer is observed at shorter wavelengths than the trans one. The LUMOs of both isomers are at the same energy level, but the HOMO of the cis isomer is shifted to a significantly lower energy than that of the trans isomer. The red emissions originate from the triplet metal-to-ligand charge transfer (MLCT) state, which is assigned by femtosecond time-resolved transient absorption spectroscopic analysis. The MLCT emission spectra of both isomers show highly structured bands with a vibronic spacing of ca. 1470 cm-1. Observation of vibrational fine structure in the emission spectra is attributed to the limited excited state structural change imposed by the rigidity of metal coordination. |
| 저자 |
유정완, 박재현, 조주형, 조양진, 김소연, 조대원, 강상욱, 손호진
|
| 소속 |
고려대 |
| 키워드 |
heteroleptic; red phosphorescence; isomer; MLCT
|
| E-Mail |
|
