Abstract
New red light-emitting phosphorescent devices using the mixed host of N,N′-dicarbazolyl-3,5-benzene [mCP] and bis(10-hydroxy-benzo[h]quinolinato)beryllium [Bebq2] doped with 5 vol.% RP411(red phosphorescent dye from SFC Co.) in the emissive layer were fabricated and evaluated according to the mixture ratio of x in a host of mCP(1−x) Bebq2(x). Among the fabricated devices, the maximum quantum efficiency was obtained in the device with in a host of x = 0.75 and the highest luminance at a given voltage was obtained in the device with a in a host of x = 0.25. On the other hand, the product of luminance and quantum efficiency showed the best characteristics in the device with a host of mCP(0.5) Bebq2(0.5). The peak wavelength in the electroluminescence spectra and color coordinates on the Commission Internationale de I’Eclairage(CIE) chart of the fabricated devices with x ≥ 0.25 in a host of mCP(1−x) Bebq2(x) were 627 nm and (0.66, 0.34), respectively.
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