| Organic and polymer thin film electroluminescent devices have become a new and fascinating area of reasearch inrecent years. The advantages of organic materials over inorganic materials are high fluorescence efficiency,wide selection of emission colors and the ease in fabrication of large size films. So organic electroluminescent (OEL) device is regarded as "The third generation of flat panel display". In this paper,the history,fundamental theories,application and fabrication of OELD arereviewed briefly.Strong fluorescent dyes are important light-emitting materials of OELDs.8-hydroxylquinoline aluminium(Alq3) is one of the best electroluminescent materials with good film-formation and thermal,excellent electron-transporting ability. But Alqs was used in OELD by vacum evaporation mostly ,because of its poor dissolubility,and easily recrystallized from the OELDs so that the OELD's stability decreased. To overcome the defects of Alqa,five kinds of Alqs derivatives have been designed and synthesized. Their chemical structures were elucidated by IR,'HNMR and element analysis. Their photoluminescence (PL) and electroluminescence (EL) properties have been investigated and the relationships between molecular structures and light- emitting properties have been studied as well.The fabrication of devices is as important as materials in OELD.The study of fabrication of OELDs is also a hot issue. It is important to improve life time,luminescent efficieny and simplify the fabrication processes of EL devices. The dye-dispersed polymer EL devices-are interested due to their simple fabrication andadjusted color. We used PMMA and PC as substrate,doped Alqs derivatives and phenylamine derivatives in it directly and made the dye-dispersed polymer EL devices by spin-coating. Their characterristics were studied. This research is significant for making EL devices more simply. The sealing technology and the driving mode were investigated as well. |
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