Organic Light Emitting Diode Host Material Composite
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Solution Overview
Problem
The development of stable and efficient host materials for phosphorescent organic electric elements is hindered by challenges in controlling energy transfer from host to dopant materials, affecting charge balance, efficiency, and lifespan.
Innovation Solution
A combination of a first and second host material is used in the emitting layer, with specific compounds represented by Formulas 1 and 2, to reduce energy barriers and maximize charge balance, enhancing efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single host material is used in the emitting layer, then the device structure is simple, but the efficiency and lifespan are limited due to insufficient control over energy transfer and charge balance
Solution Approach 1:
The patent employs a composite host material system consisting of a first host material and a second host material with different functional characteristics. The first host material (Formula 1) provides charge transport functionality while the second host material (Formula 2) provides energy transfer functionality, creating a synergistic composite system that achieves both high luminous efficiency and extended device lifespan through optimized material composition rather than structural complexity
Solution Approach 2:
The patent assigns different functional qualities to different regions of the host material system. The first host material is optimized for charge transport properties with specific HOMO/LUMO levels, while the second host material is optimized for energy transfer properties, creating local functional differentiation that enables precise control over energy transfer pathways and charge balance in the emitting layer
2Reliability
If energy transfer from host to dopant is not optimized, then the device structure remains simple, but charge balance and efficiency are compromised
Solution Approach 1:
The patent systematically adjusts key parameters of the host materials including HOMO levels, LUMO levels, and energy gap values to optimize energy transfer characteristics. By varying these parameters between the first and second host materials, the patent achieves precise control over energy transfer efficiency and charge balance without requiring complex device architecture
Solution Approach 2:
The patent introduces a second host material as an intermediary between the first host material and the phosphorescent dopant. This intermediate material facilitates optimized energy transfer from the first host to the dopant while maintaining charge balance, acting as a mediating layer that improves reliability without significantly increasing structural complexity
3Duration of action of moving object
If conventional host materials are used, then material development is straightforward, but efficiency and lifespan are insufficient
Solution Approach 1:
The patent extends device lifespan by developing a composite host material system where the first host material and second host material work synergistically. This composite approach enables simultaneous optimization of charge transport and energy transfer functions, achieving extended operational duration while maintaining feasibility in material synthesis and device manufacturing through established organic chemistry methodologies
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
This approach achieves high luminous efficiency and extended lifespan of organic electric elements by optimizing charge injection and balance in the emitting layer.
Implementation Method 1
many studies have been carried out to identify the energy transfer method from the host material to the dopant material
Implementation Method 2
In a phosphorescent organic electric element using a phosphorescent dopant material
Implementation Method 3
The TRTP (Time Resolved Transient PL) measurement method is a method of observing a decay time after irradiating a pulsed light source onto a host thin film
Implementation Method 4
In general, organic light emitting phenomenon refers to a phenomenon that converts electric energy into light energy by using an organic material
Data Source
AI summary
Provided are an organic electric element having a first electrode, a second electrode, and at least an organic material layer formed between the first electrode and the second electrode, the organic material layer comprising an emitting layer and the emitting layer comprising a mixture of host materials which improves luminous efficiency, stability, and lifespan of the element; and an organic electronic device comprising the element.