| Summary: | 碩士 === 輔仁大學 === 化學系 === 94 === Europium complexes are promising candidates for organic electro- luminescent (EL) material due to their sharp emission band. We have demonstrated red-light electrophosphorescent organic light-emitting diodes (PHOLEDs) doped with a Europium complex. The devices consisted of a monolayer structure of ITO / PVK: Eu(dbm)3(phen):PBD /LiF/Al. Firstly, we studied how the spin speed of spin coating affects the thickness of the emitting layer . We found the optimal dopant concentration for the Eu(dbm)3(phen) is 2.6%. Secondly, we employed a blend host in a PHOLEDs, which comprises poly (n-vinylcarbazole) PVK and small-molecule 4,4 -N,N’ - dicarbazole- biphenyl CBP, and the maximum red light emission of the PHOLEDs was measured at 612 nm. In addition, the external quantum efficiency and the power efficiency of the PHOLEDs are 0.01% and 0.0027 lm/W, respectively.
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