OLED Host Compound for Lower Voltage and Longer Emission Life
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Solution Overview
Problem
Current organic electronic elements face challenges in achieving high thermal stability and efficient charge balance in light-emitting layers, leading to limitations in luminous efficiency and lifespan, particularly due to the lack of a stable and efficient host material for the light-emitting layer.
Innovation Solution
A compound represented by a specific formula is used as a host material in the light-emitting layer, which improves the luminous efficiency and lifespan of organic electronic elements by lowering the driving voltage and enhancing thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional host materials are used in the light-emitting layer, then the organic electronic element can operate, but the luminous efficiency and lifespan are limited due to insufficient thermal stability and charge balance
Solution Approach 1:
The patent modifies the molecular structure of host materials by introducing specific functional groups and adjusting molecular weight parameters. This creates host materials with optimized energy levels, mobility, and thermal stability that simultaneously improve luminous efficiency and lifespan through enhanced charge balance and reduced Joule heating effects
Solution Approach 2:
The patent develops composite host materials combining multiple functional components with complementary properties. These composite structures achieve optimal energy level alignment, improved charge transport, and enhanced thermal stability, resolving the contradiction between efficiency and reliability
2Loss of energy
If the driving voltage is increased to improve luminous efficiency, then more light is produced, but Joule heating increases causing crystallization of organic material and reduced lifespan
Solution Approach 1:
The patent optimizes material parameters including mobility and energy levels to achieve efficient charge transport at lower voltages. This reduces Joule heating while maintaining luminous efficiency, preventing thermal degradation and crystallization of organic materials
3Device complexity
If only one material is used as light emitting material, then the structure is simple, but the maximum luminescence wavelength shifts to longer wavelength and color purity deteriorates
Solution Approach 1:
The patent employs a host/dopant system where the dopant material is distributed locally within the host matrix. This allows the host material to provide structural stability and charge transport while the dopant emits light at specific wavelengths, maintaining color purity without complicating the overall layer 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 compound significantly improves the luminous efficiency and lifespan of organic electronic elements while reducing the driving voltage, demonstrating enhanced thermal stability and charge balance properties.
Implementation Method 1
excitons generated in the light emitting layer are transported to the dopant, thus emitting light with high efficiency
Implementation Method 2
An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy of an organic material
Data Source
AI summary
The present invention provides the compound represented by Formula 1, an organic electric element comprising a first electrode, a second electrode, and an organic material layer formed between the first electrode and the second electrode, and electronic device thereof, and by comprising the compound represented by Formula 1 in the organic material layer, the driving voltage of the organic electric element can be lowered, and the luminous efficiency and life time of the organic electric element can be improved.