A three-terminal organic electro-luminescent (EL) device is disclosed for achieving
increased efficiency, decreased turn-on voltage, and increased brightness. The
three-terminal organic EL device has a first electrode formed on a substrate, at
least one organic material layer including an organic light-emitting layer formed
on the first electrode, a second electrode formed on the organic material layer;
and at least one third electrode formed on or inside said organic material layer.
The third electrode is formed outside of a region, which is between the first electrode
and the second electrode to prevent a reduction of luminescent area. The luminance
of the organic EL device is controlled by adjusting potential of the third electrode
with respect to the potentials of the first electrode and the second electrode.
