Method and device for transferring anisotropic crystal film from donor to receptor, and the donor
A method of forming an anisotropic crystal film, comprising providing a donor which comprises a base and an anisotropic crystal film bounded to the base, and a receptor. At least a portion of the anisotropic crystal film is placed in contact with the receptor. A loading is applied to at least a portion of the base, whereby providing shear and compressive stresses onto the donor and receptor, and transferring at least a portion of the anisotropic crystal film onto the receptor and delaminating the at least portion of the anisotropic crystal film from the base.
1. A method of forming an anisotropic crystal film, comprising:
providing a donor comprising a base and at least one anisotropic crystal film;
providing a receptor,
placing at least a portion of the anisotropic crystal film in contact with the receptor; and
applying a loading to at least a portion of the base, whereby providing distribution of shear and compressive stresses onto the donor and receptor, and transferring at least a portion of the anisotropic crystal film onto the receptor and delaminating the at least portion of the anisotropic crystal film from the base wherein the loading is applied by a knife with a round blade which is provided with a pre-determined gap on the edge of the rounded blade, whereby the portion of anisotropic crystal film between the gap and the receptor is not applied with loading and is not transferred to the receptor.
2. The method of claim 1 wherein the applied loading is controlled so that the crystalline structure of the anisotropic crystal film transferred from the donor to the receptor is undisrupted.
3. The method of claim 1 wherein the anisotropic crystal film is formed by rodlike supramolecules comprising at least one polycyclic organic compound with conjugated π-systems.
4. The method of claim 3 wherein the polycyclic organic compound contains heterocycles.
5. The method of claim 3 wherein the anisotropic crystal film possesses dichroism.
6. The method of claim 1 wherein the anisotropic crystal film has an intermolecular spacing of 3.4±0.3 Å in the direction of one of main optical axes.
7. The method of claim 1 wherein the anisotropic crystal film is made of a material capable of forming a lyotropic liquid crystal.
8. The method of claim 1 wherein the receptor is made of a material selected from the group consisting of polymers, semiconductors, glasses, ceramics, metals, dielectrics, and any combinations thereof.
9. The method of claim 1 comprising a step of pre-treating at least a portion of the surface of the receptor before the placing step.
10. The method of claim 9 wherein said pre-treating step is performed by a method selected from the group consisting of ion bombardment, corona discharge, vacuum cleaning, heating, mechanical treatment, electromagnetic irradiation, chemical modification, and any combination thereof.
11. The method of claim 10 wherein the pretreatment ensures condition that adhesion of the crystal film to the receptor is greater than adhesion of the crystal film to the base film.
12. The method of claim 1 wherein the donor further comprises an adhesive layer situated on top of the anisotropic crystal film.
13. The method of claim 12 wherein the adhesive layer comprises a pressure sensitive material.
14. The method of claim 1 wherein the receptor further comprises an adhesive layer on at least a portion of the receptor.
15. The method of claim 14 wherein the adhesive layer comprises a pressure sensitive adhesive material.
16. The method of claim 1 wherein the donor further comprises interference multilayer structure.
17. The method of claim 1 wherein the donor further comprises a layer selected from a group consisting of protective layers, adhesive layers, fluorescent layers, planarization layers, diffusive layers, light-scattering layers, reflective layers, alignment layers, electrical isolation layers, conducting electrode layers, substrate layers, liquid crystal layers, and any combination thereof.
18. The method of claim 1 wherein the receptor comprises a flat surface.
19. The method of claim 1 wherein the receptor comprises a curved surface.
20. The method of claim 1 wherein the loading is applied to provide the shear stress along the interface of the donor and the receptor.
21. The method of claim 1 wherein the loading is applied to provide the shear stress along the main optical axis of the anisotropic crystal film.
22. The method of claim 1 wherein the anisotropic crystal film comprises at least two fragments and the optical axes of the two fragments form an angle in the range of about 0 to 90 degree.
23. The method of claim 1 wherein the anisotropic crystal film comprises at least two fragments of different colors.
24. The method of claim 1 wherein the loading is applied to the entire base, whereby transferring the entire anisotropic crystal film onto the receptor.
25. The method of claim 1 wherein the placing and loading step are performed substantially simultaneously.