In the embodiments of the present invention, the hole injection layer and the hole transportation layer can be formed using inkjet method, by which the material utilization can be improved.
"For example, as shown in , forming the second functional layer in S includes forming an electron transportation layer above the quantum dot layer using the inkjet printing method.
Wherein material for the electron transportation layer can be metal oxide.
For example, as shown in , an electron injection layer can be further formed above the electron transportation layer using the inkjet printing method. For example, a hole blocking layer can also be formed using the inkjet printing method after forming the quantum dot layer and before forming the electron transportation layer .
In the embodiments of the present invention, the material utilization can be improved by using the inkjet printing method to form the electron transportation layer and so on.
For example, in S, the buffer layer can also be formed using the inkjet printing method."


Where would they get the inkjet printing tech from ?? hmm