Thin film organic electroluminescent devices are described which emplo
y a blue-emitting species as a layer sandwiched between the hole trans
porter bis(triphenyl)diamine and the light emitting electron transport
er tris(8 -hydroxyquinoline) aluminum to obtain bright (> 4700 cd/m(2)
) efficient (0.5 lm/W) white emission. (C) 1996 American Institute of
Physics.