Method and materials for patterning of an amorphous, non-polymeric, organic matrix with electrically active material disposed therein
View Patent ↗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 method of making an organic electroluminescent display or device, the method comprising:
providing a donor sheet comprising a substrate and a transfer layer disposed on the substrate, the transfer layer comprising an amorphous, non-polymeric, organic light-emitting dendrimer and an electrically active material;
providing a receptor; and
thermally transferring at least a portion of the transfer layer to the receptor.
2. The method of claim 1 , wherein the donor sheet further comprises a light-to-heat conversion layer disposed between the substrate and the transfer layer.
3. The method of claim 2 , wherein the donor sheet further comprises an interlayer disposed between the light-to-heat conversion layer and the transfer layer.
4. The method of the claim 2 , wherein the donor sheet further comprises an underlayer disposed between the substrate and the light-to-heat conversion layer.
5. The method of claim 1 , wherein the transfer layer comprises more than one layer.
6. The method of claim 1 , wherein the transfer layer is solution coated on the substrate.
7. The method of claim 1 , wherein the donor sheet is directly heated to thermally transfer at least a portion of the transfer layer to the receptor.
8. The method of claim 1 , wherein the donor sheet is exposed to imaging radiation that is converted into heat to thermally transfer at least a portion of the transfer layer to the receptor.
9. The method of claim 8 , wherein the donor sheet further comprises a light-to-heat conversion layer that converts the imaging radiation into heat.
10. The method of claim 9 , wherein the donor sheet is exposed to imaging radiation through a mask.
11. The method of claim 9 , wherein the donor sheet is exposed to imaging radiation generated by a laser.
12. The method of claim 8 , wherein the donor sheet and the receptor are brought into intimate contact during thermal transfer of at least a portion of the transfer layer to the receptor.
13. The method of claim 8 , wherein the donor sheet is spaced from the receptor during thermal transfer of at least a portion of the transfer layer to the receptor.
14. The method of claim 8 , wherein at least a portion of the transfer layer is thermally transferred to the receptor in an imagewise fashion to form a pattern on the receptor.
15. The method of claim 1 , wherein the electrically active material produces, conducts or semi-conducts a charge carrier.
16. The method of claim 1 , wherein the electrically active material comprises a hole transport material.
17. The method of claim 1 , wherein the electrically active material comprises an electron transport material.