Organic Light-Emitting Device Carrier Balance via Composite Materials
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Solution Overview
Problem
Current organic light-emitting devices face challenges in achieving high carrier balance and efficiency in the emission layer, leading to reduced lifespan and performance.
Innovation Solution
Incorporating an organic layer with specific materials represented by Formulas 1 and 2, which include arylene and heteroarylene groups, and alkylene and silylene groups, to balance hole and electron transport, enhancing carrier recombination and light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic layer materials are used, then device structure is simple, but carrier balance and emission efficiency are insufficient
Solution Approach 1:
The patent employs composite materials by combining multiple organic compounds with specific chemical structures (Formulas 1 and 2) in the organic layer. These compounds contain particular functional groups and molecular arrangements that work synergistically to improve hole and electron transport balance, thereby enhancing emission efficiency while managing the complexity through structured material selection.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical composition parameters of the organic layer, specifically incorporating materials with defined molecular structures (Formulas 1 and 2) that have optimized electronic properties. This changes the electrical and optical parameters of the layer to achieve better carrier balance and emission efficiency.
2Productivity
If conventional organic layer composition is used, then manufacturing process is simple, but carrier recombination efficiency is reduced
Solution Approach 1:
The patent modifies the chemical composition parameters of the organic layer by incorporating specific materials defined in Formulas 1 and 2. These parameter changes optimize carrier recombination efficiency while the materials are designed to be compatible with existing fabrication processes, balancing manufacturing ease with performance improvement.
Solution Approach 2:
The patent applies local quality by introducing specific organic compounds with tailored molecular structures at particular positions within the organic layer. This localized optimization of material properties enhances carrier recombination efficiency in the emission zone without requiring complete redesign of the entire device structure.
3Duration of action of stationary object
If standard organic materials are used, then device lifespan is limited, but material selection and optimization are simplified
Solution Approach 1:
The patent uses composite materials in the organic layer, combining compounds from Formulas 1 and 2 that provide both improved device lifespan and enhanced performance. The synergistic interaction between these materials extends device operational life while the structured approach to material selection manages the complexity of the composition.
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 proposed solution results in improved carrier balance, increased efficiency, and extended lifespan of the organic light-emitting device by optimizing the organic layer composition.
Implementation Method 1
Holes provided from the first electrode may move toward the emission layer through the hole transport region, and electrons provided from the second electrode may move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, are recombined in the emission layer to produce excitons. These excitons change from an excited state to a ground state, thereby generating light.
Data Source
AI summary
An organic light-emitting device including a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode, wherein the organic layer includes at least one first material and at least one second material, the first material being represented by Formula 1 and the second material being represented by Formula 2: