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We have investigated a spray method for organic electroluminescent device (OELD) fabrication, which is suitable for simple device fabrication and has the merits of large-area production and short tact time. The mean roughness of the film surface was 50 Å. For polyvinylcarbazole (PVCz)-based devices, current–voltage characteristics of the device depend on the dopant materials, and luminance of 1,910 cd/m 2 was obtained for the single-layered device with coumarin 6 used as the dopant material.
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Echigo et al. (2002) studied this question.
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