Multicolor OLED Electron Transport Layer for Balanced Injection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The efficiency of electron injection from an electron transportation layer to an emissive layer in light emitters varies significantly depending on the type of emissive and electron transportation layers used, making it challenging to optimize electron injection efficiency across multiple light emitters with different emissive layers in display devices.
Innovation Solution
A display device configuration that includes a plurality of light emitters with a common cathode and island-shaped anodes, where the electron transportation layer comprises oxide nanoparticles, a binder resin, and a photo-initiator, allowing for optimized electron injection efficiency across different emissive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a shared electron transportation layer is used among multiple light emitters with different emissive layers, then device complexity is reduced and manufacturing is simplified, but electron injection efficiency cannot be optimized for each specific emissive layer
Solution Approach 1:
The electron transportation layer is segmented into multiple distinct layers, each specifically designed and optimized for a particular emissive layer type. This segmentation allows each electron transportation layer to be tailored with appropriate materials and thickness to maximize electron injection efficiency into its corresponding emissive layer, while maintaining a shared structure that simplifies overall device manufacturing.
Solution Approach 2:
Different regions of the electron transportation layer structure are given different properties - each electron transportation layer has locally optimized material composition and thickness tailored to match its specific emissive layer partner. This local quality optimization ensures maximum electron injection efficiency for each color channel while maintaining a unified shared architecture that simplifies manufacturing processes.
2Reliability
If different electron transportation layers are used for each light emitter with different emissive layers, then electron injection efficiency is optimized for each emissive layer, but device complexity increases
Solution Approach 1:
The shared electrode structure serves multiple functions - it acts as the common electrical connection for all light emitters while also supporting multiple specialized electron transportation layers. This universal structure reduces device complexity by eliminating the need for separate electrodes for each emitter type, while still allowing each electron transportation layer to be optimized for its specific emissive layer partner.
Solution Approach 2:
Instead of increasing horizontal complexity with separate electrodes for each emitter, the solution moves to the vertical dimension by stacking multiple specialized electron transportation layers above the shared electrode. This dimensional transition allows each layer to be optimized for its function while maintaining a compact, integrated structure that doesn't significantly increase overall device complexity.
3Productivity
If electron transportation layer materials are generalized for all light emitters, then manufacturing process is simplified, but electron injection efficiency varies significantly across different emissive layers
Solution Approach 1:
The electron transportation layers utilize parameter changes in material properties - each layer is designed with specific material composition, thickness, and structural parameters optimized for its corresponding emissive layer. These parameter variations enable high electron injection efficiency for each color channel while still using a shared underlying electrode structure that maintains manufacturing efficiency.
Solution Approach 2:
The electron transportation layer structure employs composite material design where each layer combines materials specifically selected for optimal electron injection into its target emissive layer. This composite approach allows tailoring of electron injection efficiency for each color channel while maintaining a unified shared electrode platform that preserves manufacturing efficiency and simplifies the overall fabrication process.
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 facilitates the optimization of electron injection efficiency differences between light emitters, even when the emissive layers are of different types, leading to improved display performance.
Implementation Method 1
The efficiency of electron injection from an electron transportation layer of a light emitter to an emissive layer of the light emitter typically differs depending on what kind of emissive layer and what kind of electron transportation layer are used
Implementation Method 2
The electron transportation layer contains an oxide nanoparticle, a binder resin, and a photo-initiator
Data Source
AI summary
Provided are a support substrate, a thin-film transistor layer, a light emitter layer having a plurality of light emitters that emit mutually different colors of light, and a sealing layer sealing the light emitter layer. Each light emitter includes a first electrode, a hole transportation layer, an emissive layer, an electron transportation layer, and a second electrode. The electron transportation layer contains an oxide nanoparticle, a binder resin, and a photo-initiator.