Organic Electroluminescent Device High Solubility Host
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Solution Overview
Problem
Current organic electroluminescent devices face challenges in achieving high solubility of materials in solvents, leading to limitations in light emitting efficiency, luminance, power efficiency, thermal stability, and lifespan, especially when manufacturing large-sized displays using solvent-based processes.
Innovation Solution
An organic electroluminescent device is developed using an organic electroluminescent material with high solubility in solvents, comprising a host compound represented by a specific formula, which improves luminous efficiency and reduces driving voltage, allowing for efficient manufacturing through both deposition and solution processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a deposition process is used to manufacture large-sized displays, then the material can be deposited on the substrate, but the production yield decreases and investment cost increases due to the increase in substrate size
Solution Approach 1:
The patent replaces the mechanical vacuum deposition process with a solution-based coating process. The organic electroluminescent material is dissolved in a solvent to form a solution, which is then coated on the substrate using solution processing techniques. This substitution eliminates the need for expensive vacuum deposition equipment and enables large-area substrate processing, thereby improving productivity and reducing investment costs for large-sized display manufacturing.
2Ease of manufacture
If the organic electroluminescent material has low solubility in the solvent, then the solution process can be used, but the light emitting efficiency, luminance, power efficiency, thermal stability, and lifespan characteristics deteriorate
Solution Approach 1:
The patent modifies the chemical structure of the organic electroluminescent material by introducing specific molecular groups and adjusting molecular weight to enhance solubility in common solvents. This parameter change allows the material to be processed via solution methods while maintaining or improving device performance characteristics such as light emitting efficiency, luminance, power efficiency, thermal stability, and lifespan.
Solution Approach 2:
The patent uses composite material systems where the organic electroluminescent material is combined with specific solvents and additives to form optimized solutions. This composite approach ensures high solubility and uniform film formation while preserving the electroluminescent properties, thereby achieving both ease of manufacture through solution processing and high device reliability.
3Ease of manufacture
If a deposition process is used, then the material can be evaporated under vacuum conditions, but materials with high glass transition temperature cannot be used because decomposition occurs at high evaporation temperature
Solution Approach 1:
The patent replaces thermal evaporation under vacuum with solution-based coating processes. This substitution eliminates the high-temperature evaporation step that causes decomposition of materials with high glass transition temperature. The solution process allows these materials to be applied at lower temperatures, expanding material selection versatility while maintaining manufacturing effectiveness.
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 device exhibits enhanced luminous efficiency and reduced driving voltage, enabling improved performance and cost-effectiveness in large-sized display production while maintaining thermal stability and lifespan characteristics.
Implementation Method 1
the organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy by using an organic material
Implementation Method 2
the organic electroluminescence material has high solubility with respect to the solvent
Data Source
AI summary
An organic electroluminescent device according to the present invention is an organic electroluminescent device comprising a first electrode, a second electrode, and an organic material layer formed between the first electrode and the second electrode, wherein the organic material layer is formed using a composition having an organic electroluminescence material and a solvent, the organic electroluminescence material has a host, and the organic electroluminescence device has excellent operation properties such as luminous efficiency and driving voltage by using an organic electroluminescence material having high solubility in a solvent.