White-light OLED Single-layer Solution Coating
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Solution Overview
Problem
Current methods for fabricating white-light OLEDs face challenges in achieving improved performance and simpler manufacturing processes, particularly with single emitting layers and micro-molecular materials, as they suffer from poor color rendering, brightness, and efficiency due to difficulties in controlling dye evaporation and carrier overlap variations with voltage changes.
Innovation Solution
A method involving a solution manufacturing process to form a white-light OLED by mixing organic light-emitting dyes of white light combinations, such as red, green, and blue dyes, with micro-molecular substrate materials, including the preparation of a solution, addition of organic solvents, coating, and curing, which allows for efficient layer formation and improved control over dye concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum evaporation method is used to form white emitting layer with micro-molecular substrate materials, then film forming quality is improved, but manufacturing complexity and cost increase due to limited equipment availability for large-sized panels
Solution Approach 1:
The patent replaces the vacuum evaporation mechanical system with a solution-based coating system. Instead of using vacuum evaporation equipment to deposit micro-molecular materials, the invention dissolves materials in solutions and applies them through coating methods, substituting complex vacuum mechanical systems with simpler solution processing equipment.
Solution Approach 2:
The patent changes the physical state parameter of the organic materials from solid (requiring vacuum evaporation) to dissolved state (enabling solution processing). By dissolving micro-molecular substrate materials and dyes in solvents to form solutions, the invention enables coating-based fabrication that is suitable for large-sized panels while maintaining material quality.
2Ease of manufacture
If solution manufacturing process is used to form white emitting layer with micro-molecular substrate materials, then manufacturing simplicity and cost are improved, but film forming quality deteriorates compared to vacuum evaporation
Solution Approach 1:
The patent creates composite solution systems by combining micro-molecular substrate materials with specific solvents and dyes. This composite approach allows the solution to maintain the beneficial properties of micro-molecular materials (good film quality) while enabling solution processing (manufacturing simplicity). The composite solution formulation resolves the contradiction between processing ease and film quality.
Solution Approach 2:
The patent optimizes solution parameters including solvent selection, concentration, and drying conditions to achieve film quality comparable to vacuum evaporation. By carefully controlling these parameters in the solution process, the invention maintains high manufacturing precision while achieving ease of manufacture through solution coating methods.
3Illumination intensity
If multiple dyes are mixed into micro-molecular substrate materials via vacuum evaporation to achieve white light emission, then color rendering is improved, but control precision deteriorates due to difficulty in synchronously controlling evaporation percentage of multiple components
Solution Approach 1:
The patent merges multiple dye components and substrate materials into a single homogeneous solution before application. Instead of separately controlling the evaporation of multiple solid materials (which is difficult), the invention combines all components in solution form, allowing them to be applied simultaneously as one layer. This eliminates the control precision problems associated with synchronous evaporation of multiple components.
Solution Approach 2:
The patent changes the delivery state of multiple components from separate solid phases (requiring separate evaporation control) to a unified liquid solution phase. By controlling solution concentration and composition rather than individual evaporation rates, the invention achieves precise control over the final dye mixture ratios, improving manufacturing precision while maintaining good color rendering.
4Ease of manufacture
If red, green and blue dyes are mixed into high-molecular substrate materials via solution manufacturing process, then manufacturing simplicity is improved, but brightness and emitting efficiency deteriorate
Solution Approach 1:
The patent changes the substrate material parameter from high-molecular to micro-molecular type. Micro-molecular materials in solution form provide better brightness and emitting efficiency while maintaining the manufacturing simplicity of solution processing. This parameter change resolves the contradiction by selecting materials that perform well in solution-based fabrication.
Solution Approach 2:
The patent creates optimized composite solutions using micro-molecular substrate materials combined with specific dye molecules. This composite formulation achieves both solution manufacturing simplicity and high brightness/efficiency performance, as the micro-molecular components work effectively in solution form to produce bright, efficient white light emission.
5Device complexity
If white emitting layer is formed with single-layer structure, then device structure is simplified, but color stability deteriorates due to carrier overlap area displacement with voltage changes
Solution Approach 1:
The patent creates a homogeneous single-layer emitting structure where all components (substrate material and dyes) are uniformly distributed in solution form. This homogeneity ensures that carrier injection and recombination occur uniformly across the layer, preventing the carrier overlap area displacement that causes color instability in multi-layer structures. The uniform single layer maintains color stability while achieving structural simplicity.
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 approach results in enhanced brightness, efficiency, and color rendering of white-light OLEDs, with improved stability and flexibility in adjusting white light color, overcoming previous limitations in carrier overlap and voltage-dependent deviations, and enabling simpler, cost-effective large-scale production.
Implementation Method 1
When a forward bias voltage is charged on this structure, an electric hole 141 and electron 171 will be separately injected from the cathode and anode into a hole transport layer 140 and Electron transport layer 170, and then transmitted to the organic light-emitting layer 150, where they are overlapped for emitting light.
Implementation Method 2
the organic light-emitting layer of white-light OLED is formed by mixing organic light-emitting dyes of white light combinations into micro-molecular substrate materials via a solution manufacturing process
Data Source
AI summary
The present invention has provided a method for fabricating a white-light organic light-emitting diode (OLED) which allows single emitting layers and micro-molecular materials to be formed on the substrate. The white-light OLED includes a white organic emitting layer, a first electrode nearby the first surface of white organic emitting layer, and a second electrode nearby the second surface of white organic emitting layer. The white organic emitting layer is formed by mixing organic light-emitting dyes of white light combination with a micro-molecular substrate via a solution manufacturing process.