Quantum Dot Light Emitting Layer With Orthosilicate Electron Auxiliary Coating
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Solution Overview
Problem
Current light emitting devices using quantum dots face challenges in improving luminous efficiency and lifespan due to exciton quenching and hole leakage, which are exacerbated by surface defects and oxygen vacancies in metal oxide nanoparticles.
Innovation Solution
Incorporating an orthosilicate compound with metal oxide nanoparticles in the electron auxiliary layer, which minimizes surface defects, improves surface flatness, and enhances electron injection characteristics by forming a coating layer, thereby suppressing exciton quenching and hole leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal oxide nanoparticles are used in the electron auxiliary layer, then electron injection characteristics are improved, but surface defects and oxygen vacancies cause exciton quenching and hole leakage
Solution Approach 1:
The patent applies local quality by treating only the surface of metal oxide nanoparticles with orthosilicate compounds, rather than changing the bulk material properties. This surface-specific treatment addresses surface defects and oxygen vacancies locally while preserving the excellent electron injection characteristics of the metal oxide nanoparticles in the bulk.
Solution Approach 2:
The orthosilicate compound acts as an intermediary substance that bonds to the surface of metal oxide nanoparticles. This intermediary layer passivates surface defects and oxygen vacancies, reducing exciton quenching and hole leakage while maintaining the electron transport function of the metal oxide nanoparticles.
2Duration of action of stationary object
If the electron auxiliary layer structure is optimized, then device lifespan and stability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent creates a composite electron auxiliary layer by combining metal oxide nanoparticles with orthosilicate compounds. This composite structure integrates the electron injection capabilities of metal oxides with the surface-passivating properties of orthosilicates, achieving improved device lifespan through enhanced structural stability and reduced degradation.
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 solution results in improved luminance, extended lifespan, and enhanced device stability by optimizing the electron auxiliary layer's structure and performance.
Implementation Method 1
at least a portion of the orthosilicate compound may be bound to a surface of the metal oxide nanoparticles
Implementation Method 2
the metal oxide nanoparticles may include a coating layer on a surface, the coating layer including at least a portion of the orthosilicate compound
Implementation Method 3
improving electron injection characteristics
Implementation Method 4
suppressing exciton quenching
Data Source
AI summary
A light emitting device including a first electrode and a second electrode each having a surface opposite the other, a light emitting layer disposed between the first electrode and the second electrode, and an electronic auxiliary layer disposed between the light emitting layer and the second electrode, wherein the electron auxiliary layer includes metal oxide nanoparticles and an orthosilicate compound.