We have fabricated spark-processed silicon so as to produce electrolum
inescence which is readily visible in semidark conditions. There are t
hree emission peaks at around 1.3, 1.6, and 1.9 eV The photoluminescen
ce spectrum shows only one peak at around 1.9 eV. The electroluminesce
nce is polarity dependent. Although the average efficiency over areas
of several mm(2) is low, the emission is concentrated at various spots
which are bright and have a much higher efficiency. (C) 1995 American
Institute of Physics.