Quantum Dot Emitter Core-Shell Electron Transport Layer
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Solution Overview
Problem
The existing quantum dot (QD) emitting diodes suffer from charge balance issues, leading to decreased emitting efficiency due to easier and faster electron injection compared to hole injection, resulting in emission at the interface between the QD emitting material layer and the hole transporting layer.
Innovation Solution
Incorporating an electron transporting layer with a core of metal oxide and a shell of silica or PVA in the quantum dot emitting diode, which improves charge balance by controlling electron transport and hole blocking properties, thereby enhancing emitting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional electron transporting materials are used, then electron injection is easier and faster, but charge balance is destroyed and emitting efficiency decreases
Solution Approach 1:
The patent modifies the electron transporting material by creating a core-shell structure with metal oxide core and silica shell, changing the physical and chemical parameters of the material to achieve balanced charge transport while maintaining high electron injection efficiency
Solution Approach 2:
The patent uses composite materials consisting of metal oxide core and silica shell to combine the advantages of both materials, achieving both fast electron transport and improved charge balance in the QD emitting diode
2Productivity
If conventional electron transporting materials are used, then electron transport is efficient, but emission occurs at the interface between QD EML and HTL
Solution Approach 1:
The patent changes the energy level parameters and transport properties of the electron transporting material through the core-shell structure, controlling the emission location to be within the QD emitting material layer rather than at the interface
Solution Approach 2:
The silica shell acts as an intermediary layer that mediates between the metal oxide core and the QD emitting material, controlling the interaction and emission location while maintaining efficient electron transport
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 use of a metal oxide-silica or PVA core-shell electron transporting material in the QD emitting diode improves charge balance and emitting efficiency, allowing for more efficient light emission and display performance in quantum dot display devices.
Implementation Method 1
an electron in an unstable state transitions from a conduction band to a valence band such that light is emitted
Implementation Method 2
the electron from the second electrode 80 is transferred into the QD EML 50 through the EIL 70 and the ETL 60
Data Source
AI summary
A quantum dot emitting diode includes first and second electrodes facing each other; a quantum dot emitting material layer between the first and second electrodes; and an electron transporting layer including an electron transporting material and disposed between the quantum dot emitting material layer and the second electrode, wherein the electron transporting material includes a core of metal oxide and a shell of silica.