Composite Host Materials for OLED Driving Voltage and Efficiency
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Solution Overview
Problem
Current organic electroluminescent devices face challenges in achieving low driving voltage, high luminous efficiency, and long lifespan, particularly for medium and large-sized OLED panels, due to limitations in host material selection and performance.
Innovation Solution
A combination of at least one first host compound and one second host compound, represented by specific chemical formulas, is used to form a plurality of host materials that enhance the performance of organic electroluminescent devices by optimizing the light-emitting layer, which can include a third host compound for further improvement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional single host material is used, then device structure is simple, but driving voltage is high and luminous efficiency is low
Solution Approach 1:
The patent uses a composite host material system comprising a first host compound (Formula 1) and a second host compound (Formula 2) in specific weight ratios (1:99 to 99:1). This composite approach combines materials with complementary properties to achieve low driving voltage and high luminous efficiency, resolving the contradiction between performance improvement and material complexity.
Solution Approach 2:
The patent optimizes the weight ratio parameters of the two host compounds to achieve optimal device performance. By adjusting the composition ratio within the specified range, the system achieves minimum driving voltage and maximum luminous efficiency, demonstrating parameter optimization to resolve the technical contradiction.
2Productivity
If conventional host material is used, then device manufacturing is simple, but luminous efficiency is low
Solution Approach 1:
The light-emitting layer uses a composite formulation with the first host compound (Formula 1) and second host compound (Formula 2) combined with a dopant compound. This composite light-emitting material achieves high luminous efficiency while maintaining manufacturability through established doping processes.
Solution Approach 2:
The patent introduces a dopant compound as an intermediary material that interacts with the host compounds to generate high-efficiency light emission. The dopant serves as a mediator that enables efficient energy transfer and light emission, resolving the contradiction between manufacturing simplicity and luminous efficiency.
3Duration of action of stationary object
If conventional host material is used, then device structure is simple, but lifespan is short
Solution Approach 1:
The composite host material system comprising Formula 1 and Formula 2 compounds provides enhanced device lifespan through synergistic effects. The specific combination of host materials improves operational stability and longevity, resolving the contradiction between extended lifespan and increased material system complexity.
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 use of these host materials results in organic electroluminescent devices with reduced driving voltage, increased luminous efficiency, and extended lifespan, as demonstrated by improved performance metrics in OLED devices compared to conventional single-host material devices.
Implementation Method 1
An organic electroluminescent device (OLED) was first developed by Eastman Kodak in 1987, by using small aromatic diamine molecules and aluminum complexes as materials for forming a light-emitting layer
Data Source
AI summary
The present disclosure relates to a plurality of host materials comprising at least one first host compound and at least one second host compound and an organic electroluminescent device comprising the same. By comprising the specific combination of the compound according to the present disclosure as host materials, an organic electroluminescent device having low driving voltage, high luminous efficiency and long lifespan characteristics can be provided.