Zinc oxide ink and method for manufacturing the same, electron transport layer and display device
The present disclosure provides a zinc oxide ink and a method for manufacturing the same, an electron transport layer and a display device. The zinc oxide ink includes zinc oxide nanoparticles loaded with ligands, wherein the ligand is derived from aliphatic compounds having a carbon chain of three or more carbon atoms and the ligand has a cross-linkable group at a site close to a coordination atom. The zinc oxide ink increases the steric hindrance among the zinc oxide nanoparticles, thereby preventing the aggregation between the zinc oxide nanoparticles, and accordingly and further avoiding the formation of black points in the formed layer. Meanwhile, the ligands have self-crosslinking property and thus form a web-like structure to prevent the formation of pores in the layer due to the rapid volatilization of the solvent, and the quality of the formed layer by using the zinc oxide ink is ensured.
1. Zinc oxide ink, comprising zinc oxide nanoparticles loaded with ligands, wherein each ligand is derived from aliphatic compounds having a carbon chain of three or more carbon atoms; each ligand has a cross-linkable group at a carbon atom connected to a coordination atom and has a branched functional group structure at an end opposite to the coordination atom; a cross-linking structure is formed between the ligands by a dimercapto compound; and carbon atoms of the cross-linkable groups in adjacent ligands are connected through at least two “—S—” groups.
2. The zinc oxide ink according to claim 1 , wherein the coordination atom of the ligand forms an ion pair structure.
3. The zinc oxide ink according to claim 1 , wherein the ligand is derived from alcohol amine aliphatic compounds having three to eight carbon atoms.
4. The zinc oxide ink according to claim 1 , wherein the cross-linkable group includes one or more alkenyls and alkynyls.
5. The zinc oxide ink according to claim 1 , further comprising a volatile solvent and a non-volatile solvent.
6. An electron transport layer, wherein the electron transport layer is made by printing the zinc oxide ink according to claim 1 .
7. A display device, comprising the electron transport layer according to claim 6 .