123rd General Meeting of the KCS

Type Poster Presentation
Area Industrial Chemistry
Room No. Exhibition Hall 2
Time 4월 19일 (금요일) 11:00~12:30
Code IND.P-72
Subject A Detailed Raman and IR Investigation on the Satellite Vibronic Band in Blue-Emissive Pt-Complexes with High Colour Purity
Authors Bo-Sun Yun, Su-Jin Kwak, Su-Won Na, Dae won Cho*, Sang Ook Kang, Ho-Jin Son*
Department of Advanced Materials Chemistry, Korea University, Korea
Abstract We investigated the relationship between the narrowing of the emission band and structural changes using synthesiszed tetradentate Pt-complexes. All Pt-complexes showed phosphorescence with high color performance and the vibronic structure in the emission spectra was measured at 77 and 300 K. The 0-0 vibronic band was significantly more intense compared to the 0-1 vibronic band, due to the structural restriction of the fused tetradentate ligand. The spacing between the 0-0 and 1-0 vibronic bands were 1487 and ca. 1323 cm-1, respectively, which were compared to the vibration modes in the IR and Raman spectra. In the transient Raman spectrum of excited Pt-1, the intensity enhancement and up- or down-shifting of the Raman peaks could be explained by the change of electronic distribution. Actually, the HOMO orbital was a populated Cz moiety, which shifted to the terminal-pyridine moiety represented as the LUMO. The HSOMO for the excited triplet state was delocalized on the less restricted pyrazole or imidazole moiety, as well as the pyridine moiety. Therefore, the satellite vibration bands in the emission spectra were attributed to the C=C and ring starching of the terminal pyridine and the C-N single-bond stretching mode of Cz1-Cz2-Py.
E-mail yunbosun@korea.ac.kr