Core-Shell Electron Transport Particles for Light-Emitting Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current light-emitting devices face challenges in achieving high emission efficiency and lifespan due to limitations in the structure and materials used in their electron transport layers, particularly in the interaction between the emission layer and the second electrode.
Innovation Solution
A light-emitting device structure is developed with an interlayer that includes an emission layer and an electron transport layer, where the electron transport layer is formed using electron transport particles with a core and shell structure, the core comprising an oxide or chalcogenide, and the shell being a chalcogenide, enhancing electron transport and reducing chemical degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electron transport materials are used in the electron transport layer, then the device structure is simple, but the emission efficiency and lifespan are insufficient
Solution Approach 1:
The electron transport layer uses composite quantum dot particles with core-shell structure. The core contains oxide or chalcogenide materials while the shell contains chalcogenide materials, creating a composite structure that improves electron transport performance and device lifespan without excessive complexity
Solution Approach 2:
Different regions of the quantum dot particle have different compositions optimized for specific functions: the core provides electron transport capability while the shell provides protection and surface passivation. This local differentiation of material properties enhances overall performance
2Speed
If conventional electron transport materials are used, then the manufacturing process is simple, but the electron mobility is insufficient
Solution Approach 1:
The patent changes the material parameters by using quantum dots with specific size ranges (2-20 nm diameter) and specific compositional parameters (core containing oxide/chalcogenide, shell containing chalcogenide). These parameter changes improve electron mobility while maintaining compatibility with solution-based manufacturing processes
Solution Approach 2:
The quantum dot particles act as intermediary structures between the emission layer and electrode, providing enhanced electron transport pathways. The core-shell structure serves as an intermediate configuration that bridges the gap between simple materials and complex structures
3Use of energy by moving object
If the electron transport layer uses simple materials, then the device is easy to manufacture, but the external light extraction efficiency is low
Solution Approach 1:
The composite quantum dot structure with core and shell of different materials (oxide/chalcogenide core, chalcogenide shell) enhances light extraction efficiency by improving electron transport and reducing non-radiative recombination, while the nanoscale dimensions keep the overall structure relatively simple
4Productivity
If conventional materials are used in the electron transport layer, then the device structure is simple, but the emission efficiency is insufficient
Solution Approach 1:
The electron transport layer is segmented into quantum dot particles with internal core-shell segmentation. This segmentation at the nanoscale allows for optimized electron transport pathways and improved emission efficiency while maintaining a relatively simple overall layer structure
Solution Approach 2:
The patent transitions from conventional bulk or molecular materials to nanoscale quantum dot particles, adding a dimensional aspect (nanoscale size control) that enables improved emission efficiency through quantum confinement effects and enhanced surface-to-volume ratio
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
This configuration improves electron mobility and external light extraction efficiency, leading to enhanced emission efficiency and extended lifespan of the light-emitting device.
Implementation Method 1
the electron transport layer includes an electron transport particle... the core includes an oxide, a chalcogenide, or any combination thereof, and the shell includes a chalcogenide
Implementation Method 2
forming the electron transport layer including the electron transport particle by removing at least some of the organic solvent in the first composition provided on the emission layer
Data Source
AI summary
Provided are a light-emitting device, an electronic apparatus including the same, and a method of manufacturing the light-emitting device, wherein the light-emitting device includes: a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode, wherein the interlayer includes an emission layer and an electron transport layer, the electron transport layer is between the emission layer and the second electrode, and the electron transport layer includes an electron transport particle, the electron transport particle includes a core and a shell covering the core, the core includes an oxide, a chalcogenide, or any combination thereof, and the shell includes a chalcogenide, the chalcogenide of the core being the same as or different from the chalcogenide of the shell.