Organic Light-Emitting Device Composite Hosts for Efficiency and Lifetime
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Solution Overview
Problem
There is a need for the development of new materials for organic light emitting devices to enhance efficiency and stability.
Innovation Solution
The use of specific compounds represented by Chemical Formulas 1 and 2 as host materials in the light emitting layer of the organic light emitting device, which improve efficiency and reduce driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic materials are used in the light emitting layer, then the device structure is simple, but the efficiency and lifetime are insufficient
Solution Approach 1:
The patent employs composite host materials consisting of a first host material and a second host material in the light emitting layer. The first host material contains specific molecular structures (Formula 1 or 2) that enhance charge transport and exciton management, while the second host material provides complementary properties. This composite approach improves luminous efficiency and device lifetime by synergistically combining the advantages of different materials, resolving the contradiction between performance improvement and material complexity.
Solution Approach 2:
The patent systematically varies key parameters of the host materials including molecular weight, glass transition temperature, HOMO/LUMO energy levels, and charge mobility. By optimizing these parameters within specific ranges, the invention achieves enhanced efficiency and stability without requiring fundamentally new material classes, thus improving productivity while controlling the degree of complexity through parameter optimization rather than structural revolution.
2Duration of action of stationary object
If conventional organic materials are used, then the manufacturing process is simple, but the device lifetime is insufficient
Solution Approach 1:
The patent extends device lifetime by optimizing material parameters such as glass transition temperature (Tg > 80°C for the first host material) and molecular weight (≥10,000 for the first host material). These parameter changes enhance material stability and reduce degradation without fundamentally altering the manufacturing process, thus improving lifetime while maintaining ease of manufacture through conventional solution processing techniques.
Solution Approach 2:
The patent uses commercially available host materials that can be procured through standard chemical suppliers, avoiding the need for complex custom synthesis. The materials are designed to be processable by conventional methods, and while the molecular structures are optimized for performance, they rely on standard chemical building blocks that simplify the overall manufacturing approach.
3Power
If the light emitting layer uses traditional materials, then the driving voltage is high, but the material selection is straightforward
Solution Approach 1:
The patent reduces driving voltage by carefully selecting host materials with optimized energy level parameters. The first host material has HOMO level ≥ -5.5 eV and LUMO level ≥ -2.0 eV, while the second host material has complementary energy levels. This parameter optimization enables better charge injection and transport, reducing the voltage required for device operation while providing flexibility in material selection from multiple compounds that meet these criteria.
Solution Approach 2:
The patent assigns different functional properties to different host materials in the composite system. The first host material is specifically optimized for hole transport with appropriate HOMO levels, while the second host material complements this with its electronic structure. This local optimization of material properties at different positions in the energy landscape enables reduced driving voltage while maintaining straightforward selection criteria for each material component.
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 compounds enhance the efficiency and extend the lifetime of the organic light emitting device by improving the performance of the light emitting layer.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon where electric energy is converted into light energy by using an organic material
Data Source
Figure 1~2
AI summary
The present disclosure provides an organic light emitting device.