A multicolor organic light emitting device employs vertically stacked
layers of double heterostructure devices which are fabricated from
organic compounds. The vertical stacked structure is formed on a glass
base having a transparent coating of ITO or similar metal to provide a
substrate. Deposited on the substrate is the vertical stacked arrangement
of three double heterostructure devices, each fabricated from a suitable
organic material. Stacking is implemented such that the double
heterostructure with the longest wavelength is on the top of the stack.
This constitutes the device emitting red light on the top with the device
having the shortest wavelength, namely, the device emitting blue light,
on the bottom of the stack. Located between the red and blue device
structures is the green device structure. The devices are configured as
stacked to provide a staircase profile whereby each device is separated
from the other by a thin transparent conductive contact layer to enable
light emanating from each of the devices to pass through the
semitransparent contacts and through the lower device structures while
further enabling each of the devices to receive a selective bias. The
devices are substantially transparent when de-energized, making them
useful for heads-up display applications.