Composite electron transport material and preparation method therefor, and light-emitting diode
AssigneeTcl Technology Group Corporation
InventorWei Xu
Life of this patent
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Abstract
Disclosed are a composite electron transport material and a preparation method therefor, and a light-emitting diode. The composite electron transport material includes a core and at least one shell coating the core. The core is made of an inorganic electron transport material; the shell is made of a material including a metal oxide; and a band gap of the metal oxide is wider than that of the inorganic electron transport material. In the composite electron transport material, by covering modification of the core by the shell, the band gap, the conduction band energy level, and the electrical conductivity of the inorganic electron transport material are improved.
Claims18
A composite electron transport material, comprising:
- a core and a shell covering on the core;
- wherein
- the core is made of an inorganic electron transport material,
- the shell is made of a material comprising a metal oxide,
- a band gap of the metal oxide is wider than a band gap of the inorganic electron transport material, and
- a doped layer is formed at an interface between the core and the shell.
A preparation method of a composite electron transport material, comprising the steps of:
- respectively providing an inorganic electron transport material particle and a first precursor solution containing a first metal oxide precursor, and preparing the inorganic electron transport material particle into a core dispersion solution;
- and
- mixing the core dispersion solution with the first precursor solution and subjecting a resulting first mixed solution to a first heat treatment to enable the first metal oxide precursor to undergo a redox reaction and a first metal oxide shell layer to grow in situ on a surface of the inorganic electron transport material particle whereby obtaining a composite particle;
- wherein, a band gap of a first metal oxide in the first metal oxide shell layer is wider than a band gap of the inorganic electron transport material particle;
- wherein the preparation method further comprises steps of:
- providing a second precursor solution containing a second metal oxide precursor;
- preparing the composite particle into a composite particle dispersion solution;
- and
- mixing the composite particle dispersion solution with the second precursor solution and subjecting a resulting second mixed solution to a second heat treatment, to enable the second metal oxide precursor to undergo a redox reaction, and a second metal oxide shell to grow in situ on a surface of the composite particle;
- wherein, a band gap of a second metal oxide in the second metal oxide shell layer is wider than a band gap of the first metal oxide.
Dependencies are inferred from the claim text.