Abstract
Abstract We describe an improvement of a white organic EL devices using fine mesh as an evaporation mask. The bright white emission was obtained by controlling the ratio of emission area 4,4 ′ -bis(2,2-diphenylvinyl)-1,1 ′ -biphenyl (DPVBi) as a blue emitting layer and 5,6,11,12-tetraphenylnaphthacene (rubrene) as a yellow emitting layer. The device with 2,5-bis(6 ′ -(2 ′ -2 ″ -bipyridyl))-1,1-dimethyl-3,4-diphenylsilole (PyPySPyPy) as an electron transport material showed maximum luminance of 20,200 cd/m 2 , maximum efficiency of 11.7 lm/W and maximum external quantum efficiency of 3%. The white emission of Commission Internationale de l'Eclairage chromaticity coordinates was obtained (0.26,0.33).
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