| 초록 |
This investigation demonstrates the importance of the miscibility between phosphorescent Ir complexes and the polymer matrices on photo- and electroluminescence properties. The polymeric matrices examined are poly[2-(5´-cyano-5´-methyl-hexyloxy)-1,4-phenylene](PCHP), poly[2-(5´-cyano-5´-methyl-hexyloxy)-1,4-phenylene-co-pyridine] P(CHP-CO-Py), and poly(vinylcarbazole) (PVK), and poly [2-(9H-carbazole-9-yloctyloxy)-1,4-phenylene] (PCOP), poly [di-2,5-(di-9H-carbazole-9-yloctyloxy)-1,4-phenylene] (PDCOP) and Iridium(III) bis(4,6-di-fluorophenyl)-pyridinato-N,C2]picolinate(Firpic), Iridium (III)bis[2-(2´-benzothienyl)-pyridinato-N,C3´] acetylacetonatecarbazole (Btp2Ir(acaccz), was the phosphorescent complexes studied in this work. Photoluminescence behavior of the mixture containing from 0.5 to 3 mol % of FIrpic implies that PVK is most miscible with the Ir complex revealing the highest efficiency in energy transfer, while PCHP is least miscible. Electroluminescence(EL) spectra of the immiscible blends were much different from their corresponding photoluminescence spectra. In general, the EL spectra were significantly broader over the wavelength of 450-650nm. The EL spectra of PVK hybrids, however, are very similar to their PL spectra. The maximum EL efficiencies of the blends were rather low (0.1-10-3 %) and, with the exception of PVK and PCHP mixtures blending with Firpic increased the efficiency. |
