| 초록 |
Although researches in the use of organic materials as the active semiconductors in light-emitting diodes have advanced rapidly and prototype devices now meet realistic specification for application, their performance is ultimately limited by the theoretically attainable maximum quantum efficiency, only 25%. But if the electron-hole binding energy is sufficiently weak, the ratio of the maximum quantum efficiencies for electroluminescence (EL) can theoretically approach unity. In this study, to improve the ability for electron and hole injection, the oxadiazole moiety was synthesized and ter-polymerized with methylmethacrylate (MMA) and N-vinylcarbazole by dispersion polymerization. Then, an organic EL material, Alq3, was encapsulated into the ter-polymer particles by solute co-diffusion method (SCM), and the devices for the EL measurements were fabricated in the thin sandwich configuration: Ca anode/polymer/ITO cathode. Several characteristics of the EL capsules were investigated FT-IR, NMR, GC-Mass, GPC, photoelectron spectroscopy and luminescence spectroscopy. |
