Energy transfer and luminescent properties in PVK and novel donor-acceptor molecular materials blend system
| 作者: Zhao YX (Zhao Yi-Xin), Peng P (Peng Ping), Zhou YH (Zhou Yin-Hua), Wu WC (Wu Wei-Cai), Tian WJ (Tian Wen-Jing) |
| 來(lái)源出版物: CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 卷: 28 期: 7 頁(yè): 1345-1349 出版年: JUL 2007 |
摘要: The energy transfer and the luminescent properties of PVK and four novel donor-pi-acceptor( D-pi-A) molecules(CKD, TKD, PKD, NKD) doped systems were investigated with the analysis of UV-Vis absorption spectra, photoluminescent excitation( PLE) spectra and photoluminescent ( PL) spectra. The electroluminescence(EL) properties of the blend system were studied via the characterization of the devices ITO/PE-DOT/PVK: D-pi-A omega-/Alq(3)/Al. The results demonstrate that by changing the donor moieties of D-pi-A molecule, the band gap of D-pi-A molecules can be adjusted. Meanwhile the fluorescence quantum efficiency varies significantly with the stereostructure of donor moieties of D-pi-A molecules. Both the PL and EL spectra show that the energy transfer between PVK and D-pi-A molecules occurs effectively. The emission performance of the blend system could be improved with changing the dopant ratio of PVK and D-v-A molecules. The power efficiency of the device is up to 1.75 cd/A at 729.1 cd/m(2), when the dopant mass fraction between PVK and TKD is 6.0%.