Solution-Processed Charge-Generating Layer for OLED Manufacturing
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Solution Overview
Problem
Existing methods for manufacturing high-performance organic and quantum dot light-emitting diodes using charge-generating layers are limited by the need for vacuum deposition processes, which restrict large-area and low-temperature processing, and are sensitive to substrate work functions.
Innovation Solution
A light-emitting element with a charge-generating layer formed through a solution process, comprising a p-type organic semiconductor and an n-type oxide semiconductor in a layer-by-layer structure, using materials like PEDOT:PSS and zinc oxide, allowing for reduced processing times and substrate independence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum deposition process is used to form charge-generating layer, then manufacturing precision and reliability are improved, but productivity is reduced due to long process time (full hour including preheating, deposition, cooling)
Solution Approach 1:
The patent changes the fundamental process parameter from vacuum deposition to solution process, enabling charge-generating layer formation at room temperature without vacuum equipment. This reduces process time from one hour to minutes while maintaining layer quality through controlled solution deposition and drying
Solution Approach 2:
The patent replaces the mechanical vacuum deposition system with a chemical solution process, eliminating the need for ultra-vacuum equipment, preheating, and cooling steps. The charge-generating layer is formed through solution deposition and ambient drying, dramatically reducing process time and equipment complexity
2Manufacturing precision
If vacuum deposition process is used for large-area processing, then manufacturing precision is maintained, but substrate bending occurs reducing reliability
Solution Approach 1:
The patent changes the processing temperature parameter from high temperature vacuum deposition to room temperature solution process. This eliminates thermal stress on substrates during large-area processing, preventing substrate bending while maintaining layer uniformity through solution-based deposition
Solution Approach 2:
The patent replaces the vacuum deposition mechanical system with a solution process that can be applied to large-area substrates without requiring vacuum sealing. The solution can be deposited uniformly across large areas and dried at room temperature, maintaining both layer quality and substrate integrity
3Device complexity
If charge-generating layer is formed by vacuum deposition, then device complexity is reduced, but ease of manufacture is worsened due to requirement of ultra-vacuum equipment
Solution Approach 1:
The patent replaces the complex vacuum deposition mechanical system with a simple solution process that can be performed in ambient atmosphere. The charge-generating layer is formed by depositing solution and allowing it to dry, eliminating the need for ultra-vacuum equipment, preheating chambers, and complex control systems
Solution Approach 2:
The patent employs a self-drying mechanism where the solvent in the charge-generating layer solution evaporates naturally at room temperature to form the functional layer. This eliminates the need for external heating, vacuum pumping, and complex process control equipment, significantly simplifying the manufacturing system
Data Source
AI summary
The present invention provides a light emitting element using a charge generating layer formed through a solution process and a method for manufacturing the same. The present invention provides a light emitting element comprising a positive electrode, a negative electrode, a light emitting layer, and a charge generating layer, the light emitting element being characterized in that the charge generating layer has a p-type layer, which comprises an organic semiconductor, and an n-type layer, which comprises an oxide semiconductor, formed in a layer-by-layer structure through a solution process.