METHOD AND MATERIALS FOR PATTERNING OF AN AMORPHOUS, NON-POLYMERIC, ORGANIC MATRIX WITH ELECTRICALLY ACTIVE MATERIAL DISPOSED THEREIN
In one method of making an organic electroluminescent device, a transfer layer is solution coated on a donor substrate. The transfer layer includes an amorphous, non-polymeric, organic matrix with a light emitting material disposed in the matrix. The transfer layer is then selectively patterned on a receptor. Examples of patterning methods include laser thermal transfer or thermal head transfer. The method and associated materials can be used to form, for example, organic electroluminescent devices.
1 . A donor sheet, comprising:
a substrate;
a light-to-heat conversion layer disposed on the substrate for converting incident imaging radiation into heat;
a first transfer layer disposed on the light-to-heat conversion layer, wherein the first transfer layer comprises an amorphous non-polymeric electroactive material soluble in a solvent; and
at least one additional electroactive transfer layer disposed on the light-to-heat conversion layer, wherein the at least one additional transfer layer is susceptible to the solvent and comprises a light emitting material.
2 . The donor sheet of claim 1 , wherein the electroactive material of the first transfer layer comprises a hole blocking material.
3 . The donor sheet of claim 1 , wherein the electroactive material of the first transfer layer comprises an electron transport material.
4 . The donor sheet of claim 1 , wherein the at least one additional transfer layer comprises a light emitting material.
5 . The donor sheet of claim 1 , wherein the at least one additional transfer layer comprises a hole transport layer.
6 . The donor sheet of claim 5 , wherein the at least one additional transfer layer comprises a hole injection layer.