Methods and articles including nanomaterial
View Patent ↗A method of depositing a nanomaterial onto a donor surface comprises depositing a composition comprising nanomaterial onto a donor surface from a micro-dispenser. In another aspect of the invention there is provided a method of depositing a nanomaterial onto a substrate. Methods of making a device including nanomaterial are disclosed. An article of manufacture comprising nanomaterial and a material capable of transporting charge disposed on a backing member is disclosed.
1. A method of depositing semiconductor nanocrystals and a charge transport material onto a substrate comprising:
depositing a composition comprising inorganic light emissive semiconductor nanocrystals that emit light having a predetermined wavelength, a non-polymeric material capable of transporting charge that has a triplet energy which is at least greater than the bandgap of the semiconductor nanocrystals, and liquid onto a surface of a donor film from a micro-dispenser, wherein the semiconductor nanocrystals are individually dispersed in the composition, and depositing at least a portion of the composition disposed on the donor film surface onto the substrate by contacting the composition deposited on the donor film surface to the surface of the substrate under conditions to cause the composition to deposit onto the substrate, and removing the donor film from the deposited composition.
2. A method in accordance with claim 1 further comprising removing liquid from the composition disposed on the donor film before depositing at least a portion of substantially liquid-free composition onto the substrate.
3. A method for making a light-emitting device comprising:
providing a substrate including an electrode;
providing a film including a layer comprising a composition including a light-emitting nanomaterial and a non-polymeric material capable of transporting charge disposed on a side thereof, wherein the light-emitting nanomaterial comprises inorganic light emissive semiconductor nanocrystals that emit light having a predetermined wavelength and wherein the semiconductor nanocrystals are individually dispersed in the composition, and wherein the material capable of transporting charge has a triplet energy which is at least greater than the bandgap of the semiconductor nanocrystals;
contacting the film including the layer to a surface of the substrate including the electrode under conditions to cause the layer to be deposited on the substrate; removing the film from the layer deposited on the surface; and
disposing a second electrode over the layer.
4. A method in accordance with claim 3 , wherein the substrate further includes a hole transport material, an electron transport material, a hole injection material, an electron injection material, or a combination thereof.
5. A method in accordance with claim 3 wherein the semiconductor nanocrystals comprise a core/shell structure.
6. A method in accordance with claim 5 wherein the core comprises a Group IV element, a Group II-VI compound, a Group II-V compound, a Group III-VI compound, a Group III-V compound, a Group IV-VI compound, a Group I-III-VI compound, a Group II-IV-VI compound, a Group II-IV-V compound, an alloy including any of the foregoing, or a mixture including any of the foregoing.
7. A method in accordance with claim 6 wherein the shell comprises a Group IV element, a Group II-VI compound, a Group II-V compound, a Group III-VI compound, a Group III-V compound, a Group IV-VI compound, a Group I-III-VI compound, a Group II-IV-VI compound, a Group II-IV-V compound, an alloy including any of the foregoing, or a mixture including any of the foregoing.
8. A method in accordance with claim 1 wherein the donor film comprises a sheet, a film, a tape, or a web.