OLED Organic Material Layer Composition for Low-Voltage Emission
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Solution Overview
Problem
There is a continuous need for developing new materials to improve the efficiency and stability of organic light emitting devices.
Innovation Solution
The organic light emitting device comprises a first and second electrode with an organic material layer containing compounds of specific Formulae 1 and 2, which include substituted or unsubstituted arylene or heteroarylene groups, aryl or heteroaryl groups, and specific substituents, enhancing the device's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic materials are used in the organic material layer, then the device structure can be maintained, but the driving voltage remains high and efficiency is limited
Solution Approach 1:
The patent changes the chemical structure parameters of the organic materials by introducing specific compounds with Formula 1 and Formula 2, which have optimized molecular structures including arylene groups, heteroarylene groups, and specific substituent patterns. These parameter changes in molecular structure lead to improved charge transport properties and lower driving voltage while maintaining device reliability
Solution Approach 2:
The patent uses composite organic material systems comprising multiple layers with different functional compounds (Formula 1 and Formula 2 compounds in different layers), creating a composite material structure that optimizes both voltage characteristics and overall device performance through synergistic effects of different materials
2Productivity
If the organic material layer uses standard multi-layer structure, then device stability is maintained, but efficiency is insufficient
Solution Approach 1:
The patent applies local quality by assigning different functional compounds to different layers within the organic material structure. Formula 1 compounds are used in specific layers while Formula 2 compounds are used in other layers, with each layer optimized for its specific function (hole injection, electron injection, light emission), thereby improving overall efficiency while maintaining structural stability
Solution Approach 2:
The organic material layer is segmented into multiple functional layers, each containing specific compounds (Formula 1 or Formula 2). This segmentation allows independent optimization of each layer's properties for its specific function, improving overall device efficiency while maintaining the stability of the multi-layer composition structure
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 achieves low driving voltage, high efficiency, and extended service life.
Implementation Method 1
An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy by using an organic material
Data Source
AI summary
Provided is an organic light-emitting element comprising: a first electrode; a second electrode provided to face the first electrode; and an organic material layer provided between the first electrode and the second electrode, in which the organic material layer comprises a layer comprising a compound of Formula 1:wherein: L1 is a direct bond, or a substituted or unsubstituted arylene or heteroarylene group; Ar1 is a substituted or unsubstituted aryl or heteroaryl group; R1 to R12 are each independently hydrogen, a nitrile group, a halogen, or a substituted or unsubstituted alkyl, silyl, aryl or heteroaryl group, or adjacent groups bond together to form a ring; and any two adjacent R1 to R4 bond together to form a substituted or unsubstituted aromatic ring,and a layer comprising a compound of Formula 2:wherein: Ar2 to Ar4 are each independently a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, or -L2-Z.