Organic Electronic Hole Transport Composition for Thermal Degradation
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Solution Overview
Problem
Existing organic electric elements face issues with high power consumption, increased driving voltage, and reduced lifespan due to thermal degradation at the interfaces between the hole injection layer and hole transport layer, as well as the hole transport layer and emitting layer, particularly in blue organic electric elements.
Innovation Solution
The use of a hole transport layer composed of a mixture of two compounds with different structures, as represented by Formula 1, to control charge injection efficiently and reduce thermal degradation, thereby enhancing luminous efficiency and extending the life span of the organic electric element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single hole transport material is used in the hole transport layer, then the device structure is simple, but thermal degradation occurs at interfaces reducing life span
Solution Approach 1:
The patent applies composite materials by combining two different hole transport materials (compound A and compound B) in the hole transport layer. Compound A has higher hole transport capability while compound B has higher thermal stability. This composite structure reduces thermal degradation at interfaces between the hole injection layer and hole transport layer, and between the hole transport layer and emitting layer, thereby extending the device life span while maintaining reasonable structural complexity.
2Power
If a material with high hole transport capability is used, then driving voltage is reduced, but excessive charge injection occurs reducing efficiency and life span
Solution Approach 1:
The patent applies local quality by assigning different functional characteristics to different regions of the hole transport layer through spatial distribution of compound A and compound B. Compound A dominates in regions requiring high hole transport capability (near the hole injection layer), while compound B dominates in regions requiring thermal stability and controlled charge transport (near the emitting layer). This localized functional distribution optimizes both driving voltage reduction and efficiency maintenance.
Solution Approach 2:
The patent applies parameter changes by varying the hole transport capability and thermal stability parameters across the hole transport layer through the composite material system. By adjusting the ratio and distribution of compound A and compound B, the patent optimizes the balance between hole transport capability (for low driving voltage) and thermal stability (for preventing excessive charge injection and maintaining efficiency).
3Illumination intensity
If blue organic electric elements are used, then display quality is improved, but progressive driving voltage increase occurs increasing power consumption and shortening life span
Solution Approach 1:
The patent applies composite materials specifically to address the blue OLED problem by using a composite hole transport layer with compound A (high hole transport capability) and compound B (high thermal stability). This composite structure prevents thermal degradation at interfaces, maintains stable driving voltage over time, and reduces progressive power consumption, thereby extending the life span of blue organic electric elements while maintaining display quality.
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 significantly improves luminous efficiency and extends the life span of the organic electric element by optimizing charge injection and reducing thermal degradation at critical interfaces, leading to improved performance and reduced power consumption.
Implementation Method 1
The organic electric element using the organic luminescence phenomenon is, by applying current, self-luminous element using luminescence principle of luminescent material by recombination energy of holes injected from the anode and electron injected from the cathode
Implementation Method 2
life span and driving voltage problem are very relevant to thermal degradation problems of a hole injection material and a hole transport material
Data Source
AI summary
Provided are an organic electric element and a display device using the same as a hole transport layer comprising a composition composed of two or more compounds having similar structures to improve luminous efficiency, stability and life span of an electric element, and an electronic device including the same.