Organic Light Emitting Device High Glass Transition Material
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Solution Overview
Problem
Organic light emitting devices with on-chip color filters face issues of photodeterioration and thermal deterioration due to high-energy light irradiation and annealing during the patterning process, leading to reduced efficiency, higher voltage, and lower durability.
Innovation Solution
Incorporating an organic compound layer with a weight ratio of 50% or more of materials having a glass transition temperature of 130° C. or more, and excluding a specific vinylene group structure to prevent morphological changes and intermolecular reactions, ensuring stability during the color filter formation step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If on-chip color filters are formed by photolithography and annealing, then alignment accuracy and resolution are improved, but photodeterioration and thermal deterioration of organic compounds occur
Solution Approach 1:
The patent changes the glass transition temperature parameter of the organic compound from below 100°C to 130°C or higher. This parameter change enables the organic compound to withstand the annealing process (thermal stress) without undergoing morphological changes or deterioration, while maintaining the benefits of on-chip color filter formation for alignment accuracy.
Solution Approach 2:
The patent uses a composite organic compound consisting of a host compound and a guest compound, where the host compound provides structural stability with high glass transition temperature (130°C or higher) and the guest compound provides light-emitting functionality. This composite structure allows the material to resist both photodeterioration and thermal deterioration while maintaining light-emitting properties.
2Manufacturing precision
If high-energy light irradiation is used for photolithography patterning, then color filter formation precision is improved, but photodeterioration of organic compounds increases
Solution Approach 1:
The patent selects organic compounds with inherently high glass transition temperatures (130°C or higher) and stable chemical structures before the photolithography process. This beforehand selection cushions the organic compound against photodeterioration effects during high-energy light irradiation, preventing molecular degradation and maintaining compound integrity throughout the patterning process.
3Manufacturing precision
If annealing is performed during color filter film formation, then film quality is improved, but thermal deterioration of organic compounds occurs
Solution Approach 1:
The patent raises the glass transition temperature parameter of the organic compound to 130°C or higher, which allows the material to maintain its amorphous state and molecular structure during the annealing process. This parameter change enables the organic compound to withstand the thermal stress of annealing without undergoing detrimental morphological changes or chemical decomposition.
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 solution maintains the stability and performance of the organic light emitting device by preventing crystallization and maintaining amorphous films, resulting in improved heat resistance, light emitting characteristics, and operational durability.
Implementation Method 1
the organic compound layer contains, in a weight ratio of 50 wt % or more, an organic compound having a glass transition temperature of 130° C. or more
Implementation Method 2
annealing during the step of forming color filter films may cause thermal deterioration of the organic compounds
Data Source
AI summary
An organic light emitting device including a pair of electrodes and an organic compound layer disposed between the pair of electrodes, wherein the organic compound layer contains, in a weight ratio of 50 wt % or more, an organic compound having a glass transition temperature of 130° C. or more, and the organic compound does not have a moiety represented by formula [1] below,where, in formula [1], *'s represent bonding positions.