We present a recently developed numerical code for OLED simulation. This co
de contains a detailed description of contacts, charge transport and recomb
ination. Its efficiency is briefly shown through examples of single- and bi
layer devices and discussed in more detail through the investigation of the
action of a LiF thin film on injection. In particular, we show how the cod
e can help to discriminate between several possible explanations for this p
henomenon. (C) 2001 Elsevier Science B.V. All rights reserved.