Mixed vapor deposited films for electroluminescent devices

An energizable, light emitting structure, comprising:

• a transparent substrate;
• a first layer of substantially transparent, electrically conductive material supported on said substrate;
• a transparent, energizable, light emitting device (LED) supported on said first layer of substantially transparent, electrically conductive material, said LED including an emission layer comprising at least one emitting compound in a matrix of at least one host compound capable of carrying electrons to the emitting compound;
• a second layer of electrically conductive material supported by said LED;
• and
• said LED being operative to produce light and transmit it through said transparent substrate when energized.

A multicolor, energizable, light emitting display comprising:

• a plurality of energizable, light emitting structures;
• each of said structures comprising a plurality of transparent, light emitting devices (LED) that are stacked on each other;
• each of said LEDs in each of said structures being operative to emit a different color light when energized and including an emission layer comprising at least one emitting compound in a matrix of at least one host compound capable of carrying electrons to the emitting compound;
• and
• means for selectively energizing at least one of said LEDs in each of said structures so that the color produced by each of said light emitting structures is determined by which LED or LEDs in each light emitting structure is energized so that light emitted from said structures creates an image having a predetermined shape and color.

A method of fabricating a multicolor, energizable light emitting structure having a top and a bottom in vertical alignment, comprising the steps of:

• providing a transparent substrate between the top and bottom;
• providing a first substantially transparent electrically conductive layer on said transparent substrate;
• providing a first transparent, light emitting diode (LED) on said substrate having an emission layer comprising at least one emitting compound and at least one host compound capable of carrying electrons to the emitting compound, said first LED being operable when energized to emit a light of a first predetermined wavelength in a vertical path through the structure;
• providing a second substantially transparent, electrically conductive layer on said first LED;
• providing a second transparent, light emitting diode (LED) on said second substantially transparent, electrically conductive layer, said second (LED) comprising an emission layer comprising at least one of said emitting compounds and at least one of said host compounds being operable when energized to emit a light of a second predetermined wavelength in a vertical path through the structure, that is longer than said first predetermined wavelength;
• and
• an electrically conductive layer on said second (LED).

A transparent energizable, light emitting device (LED), comprising:

• an emission layer comprising at least one emitting compound and a matrix of at least one host compound capable of carrying electrons to the emitting compound, a hole transporting layer and an electron transporting layer;
• said emission layer being disposed between said hole transporting layer and said electron transporting layer;
• and
• a first layer of substantially transparent electrically conductive material, and a second layer of electrically conductive material, said first layer being on said hole transporting layer, said second layer being on said electron transporting layer.

A multicolor light emitting device (LED) structure, comprising:

• a plurality of at least a first and a second light emitting organic device (LED) stacked one upon the other, to form a layered structure, with each LED separated one from the other by a transparent conductive layer to enable each device to receive a separate bias potential to emit light through the stack, at least one of said LED's comprising an emission layer, said emission layer comprising at least one of
• a) a trivalent metal complex having the formula:
• wherein R is selected from the group consisting of hydrogen, an alkyl group, an aryl group, and a heterocyclic group which may be substituted with at least one substituent selected from the group consisting of aryl, halogen, cyano and alkoxy;
• M is a trivalent metal ion;
• L is a ligand selected from the group consisting of picolylmethylketone;
• substituted and unsubstituted salicylaldehyde;
• a group of the formula R(O)CO— wherein R is as defined above, halogen;
• a group of the formula RO— wherein R is as defined above;
• bistriphenyl siloxides;
• and quinolates and derivatives thereof;
• and
• b) a trivalent metal bridged complex having the formula:
• wherein R, M, A, n1, n2, m1 and m2 are as defined above, with the proviso that each R can not be hydrogen at the same time.