Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating
Reexamination Certificate
2006-08-15
2006-08-15
Cleveland, Michael (Department: 1762)
Coating processes
Electrical product produced
Fluorescent or phosphorescent base coating
C427S066000, C427S272000, C427S273000, C427S282000, C427S335000, C427S336000, C427S352000
Reexamination Certificate
active
07090890
ABSTRACT:
The methods of this invention involve modification of the properties of an organic film after it has been deposited by either adding new components into it from its top or bottom surface, or by causing components to leave the film from its top or bottom surface. In the examples of these methods, the emitting color of light-emitting diodes are modified based on doped polymers by locally introducing dopants causing different color emission into the film by local application of a solution containing the desired dopant to the film surface (by ink jet printing, screen printing, local droplet application, etc.). This overcomes difficulties encountered with the direct patterning of three separately formed organic layers (each which uniformly coats an entire surface when formed) into regions for separate R, G, and B devices due to the sensitivities of the organic materials to chemicals typically used with conventional patterning technologies. Alternatively, dopants may be introduced in an organic film by diffusion from one layer into the film. Alternatively, dopants may be selectively removed from a film with solvents, etc.
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Hebner Thomas R.
Pschenitzka Florian
Sturm James C.
Cleveland Michael
Kenyon & Kenyon LLP
The Trustees of Princeton University
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