An electroluminescent device comprising: a first charge carrier injecting layer
for injecting positive charge carriers; a second charge carrier injecting layer
for injecting negative charge carriers; and a light-emissive layer located between
the charge carrier injecting layers and comprising a mixture of: a first component
for accepting positive charge carriers from the first charge carrier injecting
layer; a second component for accepting negative charge carriers from the second
charge carrier injecting layer; and a third, organic light-emissive component for
generating light as a result of combination of charge carriers from the first and
second components; at least one of the first, second and third components forming
a type II semiconductor interface with another of the first, second and third components.
