Composite material, quantum dot light-emitting diode and preparation method thereof

A quantum dot light-emitting diode, comprising:

• a cathode, an anode, a quantum dot light-emitting layer arranged between the cathode and the anode, and an electron transport layer arranged between the cathode and the quantum dot light-emitting layer, wherein the electron transport layer comprises a composite material prepared by a preparation method comprising:
• providing a ZnO nanoparticle and an Au source;
• the Au source includes at least one of a bulk Au or an Au particle;
• mixing the ZnO nanoparticle, the Au source, and an S source with a first organic solvent, and performing a hydrothermal reaction, before obtaining the composite material;
• and/or the electron transport layer comprises a composite material comprising:
• a core and a shell formed on a surface of the core;
• the core material is a ZnO nanoparticle, the shell material is ZnS and Au;
• wherein the shell comprises a ZnS layer and a plurality of Au atoms or Au microclusters loaded on a surface of the ZnS layer and in an isolated distribution, while the ZnS layer is coated on a surface of the core.

A preparation method for a quantum dot light-emitting diode, comprising:

• providing an anode;
• preparing a quantum dot light-emitting layer on the anode;
• preparing an electron transport layer on the quantum light-emitting layer, the electron transport layer comprising a composite material prepared by a preparation method comprising:
• providing a ZnO nanoparticle and an Au source, and the Au source includes at least one of a bulk Au or an Au particle;
• mixing the ZnO nanoparticle, the Au source, and an S source with a first organic solvent, and performing a hydrothermal reaction, before obtaining the composite material;
• and/or the electron transport layer comprising a composite material comprising:
• a core and a shell formed on a surface of the core;
• the core material is a ZnO nanoparticle, the shell material is ZnS and Au;
• wherein the shell comprises a ZnS layer and a plurality of Au atoms or Au microclusters loaded on a surface of the ZnS layer and in an isolated distribution, while the ZnS layer is coated on a surface of the core;
• preparing a cathode on the electron transport layer;
• or
• providing a cathode;
• preparing an electron transport layer on the cathode, the electron transport layer comprising the composite material prepared by the preparation method comprising:
• providing a ZnO nanoparticle and an Au source;
• the Au source includes at least one of a bulk Au or an Au particle;
• mixing the ZnO nanoparticle, the Au source, an S source with a first organic solvent, and performing a hydrothermal reaction, before obtaining the composite material;
• and/or the electron transport layer comprising the composite material comprising:
• a core and a shell formed on a surface of the core;
• the core material is a ZnO nanoparticle, the shell material is ZnS and Au;
• wherein the shell comprises a ZnS layer and a plurality of Au atoms or Au microclusters loaded on a surface of the ZnS layer and in an isolated distribution, while the ZnS layer is coated on a surface of the core;
• preparing a quantum dot light-emitting layer on the electron transport layer;
• and
• preparing an anode on the quantum dot light-emitting layer.