Abstract
A novel blue luminescent chelate complex Bepp 2 (pp = 2-(2-hydroxyphenyl)pyridine) was synthesized as an electroluminescent material. The single-crystal X-ray diffraction study showed that there are intermolecular π...π interactions in the solid state of Bepp 2 . This structural character can facilitate charge transport ability. The photoluminescence and electroluminescence properties of Bepp 2 were characterized. Bepp 2 exhibits very strong photoluminescence at 440 nm in chloroform solution. Its PL quantum yield is 80% higher than that of Alq 3 in solution. In this paper we report that Bepp 2 can be used as an emitting material to fabricate blue light electroluminescent devices. The devices with the configuration of [ITO/Cu-Pc/TPD/Bepp 2 /LiF/Al] show electroluminescent efficiency up to 0.55 lm/W. Bepp 2 shows blue EL emission centered at 450 nm. We also demonstrated that Bepp 2 can be used as host material to prepare orange-red EL devices. For the devices of [ITO/TPD/DCM (2wt %) doped Bepp 2 /Al], orange-red color light was observed.
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