多層型有機EL素子の光放射スペクトル

概要

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The emission spectra of organic light-emitting device (OLED) with multi-layers structure were experimentally observed. In the OLED (Type-III) with the three layers structure, α-NPD (4, 4'-bis (N-(1-naphthyl)-N-phenyl-amino)biphenyl), Alq3(tris(8-hydroxyquinoline) aluminum) and BCP(2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline) were used as hole-transporting layer, emissive layer and electron-transporting layer, respectively. The efficiency of the Type-III from electrical input to optical output was ten times higher than that of the Type-II (α-NPD was used as hole-transporting layer and Alq3 as emissive and electron-transporting layer). In the Type-III, the wavelength at the peak intensity in the emission spectrum shifted to longer wavelength as the drive-voltage was going up, but this dependence was not observed in the Type-II. The wavelength at the spectral peak intensity to the direction of the emission angle of 30 degrees was shorter than that of 90 degrees.
近畿大学の論文
2006-12-20