We review some recent results from novel light emitting heterostructur
es made from vacuum deposited organic semiconductors. The ability to g
row these materials in amorphous or quasi epitaxial thin films on a va
riety of substrates, and their unique optoelectronic properties, creat
e device applications unobtainable with conventional inorganic materia
ls. (C) 1998 Published by Elsevier Science S.A. All rights reserved.