Quantum Dot Luminescent Material With Graphene Oxide Hole Injection Layer
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Solution Overview
Problem
The existing solution methods for producing quantum dot films, which involve organic ligands to stabilize quantum dots, hinder charge transfer and reduce carrier mobility, making the materials less conductive.
Innovation Solution
A quantum dot luminescent material structure comprising a hole injection layer with uniformly distributed nickel oxide and graphene oxide, a hole transport layer, a quantum dot light emitting layer with perovskite nanodots, an electron transport layer, and an electron injection layer, where graphene oxide enhances carrier mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If organic ligands are used to stabilize quantum dots in solution, then stability of quantum dots is improved, but carrier mobility is reduced
Solution Approach 1:
The patent removes organic ligands from the quantum dot structure by using a ligand-free synthesis approach. Quantum dots are synthesized in an organic solvent and then transferred to an aqueous environment where they stabilize without organic ligands, extracting the harmful component while maintaining stability.
Solution Approach 2:
The patent changes the stabilization mechanism from organic ligand-based to inorganic/electrostatic-based stabilization. By adjusting parameters such as pH, ionic strength, and surface charge density, quantum dots achieve stability without organic ligands, enabling high carrier mobility while maintaining colloidal stability.
2Stability of the object's composition
If organic ligands are used to maintain quantum dot stability, then quantum dot stability is improved, but conductivity is reduced
Solution Approach 1:
The patent extracts organic ligands from the quantum dot surface by synthesizing quantum dots in organic solvents and then transferring them to aqueous environments. This removal eliminates the insulating organic layer while maintaining quantum dot stability through alternative stabilization mechanisms.
Solution Approach 2:
The patent creates a composite structure where quantum dots are stabilized by inorganic ions or electrostatic interactions in aqueous solution. This composite approach combines the optical properties of quantum dots with the conductivity of ligand-free surfaces, achieving both stability and high conductivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The addition of graphene oxide to the hole injection layer significantly improves carrier mobility and conductivity of the quantum dot luminescent material.
Implementation Method 1
graphene oxide greatly hinders the transfer of charge between quantum dots, which seriously reduces the mobility of carriers in quantum dot materials and makes them less conductive
Implementation Method 2
a quantum dot light emitting layer disposed on the hole transport layer, wherein the quantum dot light emitting layer comprises uniformly distributed perovskite nanodots
Data Source
AI summary
A quantum dot luminescent material and a method of producing thereof. The quantum dot luminescent material includes a hole injection layer, a hole transport layer, a quantum dot light emitting layer, an electron transport layer, and an electron injection layer. The quantum dot luminescent layer is located on the hole transport layer, and the quantum dot luminescent layer includes uniformly distributed perovskite nanodots.