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 Im/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). (C) 2004 Elsevier B.V. All rights reserved.