Versatile Hole Transporting Matrix for Polychromatic OLEDs
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Solution Overview
Problem
Current OLEDs face inefficiencies in charge carrier balance and quantum efficiency, particularly in polychromatic devices where multiple materials complicate manufacturing and reduce performance, with a need for versatile materials that can be used across various emitters without deteriorating performance parameters.
Innovation Solution
A high-versatility hole transporting matrix compound, represented by formula (1), is developed for use in both phosphorescent and fluorescent OLEDs, capable of functioning as both a hole transporting and electron blocking layer, enhancing operational efficiency and longevity across different emission colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple different materials are used in polychromatic OLEDs to achieve desired chromaticity, then the color performance is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies universality by developing a single hole transporting matrix compound (formula 1) that can be used across multiple OLED types (phosphorescent and fluorescent) and in multiple layers (hole transporting layer and electron blocking layer), eliminating the need for different materials in polychromatic devices while maintaining optimal performance across various emitters
Solution Approach 2:
The patent merges the functions of hole transporting layers and electron blocking layers by using the same matrix compound (formula 1) in both layers, thereby simplifying the material system while achieving both charge transport and electron blocking functions necessary for optimal OLED performance
2Illumination intensity
If multiple different materials are used in polychromatic OLEDs, then the desired chromaticity is achieved, but the manufacturing throughput and cost efficiency decrease
Solution Approach 1:
The universal matrix compound (formula 1) enables simplified manufacturing processes by allowing the same material to be used across different OLED types and layers, reducing the complexity of material handling, storage, and processing while maintaining high manufacturing throughput and color performance
3Reliability
If specialized materials are used for each OLED type (phosphorescent vs fluorescent), then the performance is optimized, but the material versatility and ease of manufacture decrease
Solution Approach 1:
The matrix compound of formula (1) achieves universality by being applicable to both phosphorescent and fluorescent OLEDs, as well as serving dual purposes as both hole transporting and electron blocking materials, thereby maintaining performance optimization while significantly enhancing material versatility
Solution Approach 2:
The patent utilizes parameter changes by adjusting the dopant ratio (92:8 weight ratio with dopant) and molecular structure parameters of the matrix compound to achieve optimal performance across different OLED types and layer functions, demonstrating adaptability through controlled parameter variation
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 (1) achieves comparable performance to state-of-the-art matrices in phosphorescent OLEDs and outperforms them in fluorescent OLEDs, offering improved operational voltage and efficiency while maintaining device longevity, thus enabling high-performance monochromatic and polychromatic devices with simplified manufacturing processes.
Implementation Method 1
hole transporting and/or electron blocking layers... responsible for transport of negative and positive charge carriers into the emission layer
Implementation Method 2
hole transporting and/or electron blocking layers... responsible for transport of negative and positive charge carriers
Implementation Method 3
the electroluminescence (EL) property of certain organic materials is used... Recombination of these charge carriers results in an excited state, which relaxes to the ground state under light emission
Data Source
Figure 1~2b
Figure 3
AI summary
The present invention relates to organic light-emitting diodes (OLEDs) comprising at least one substantially organic layer comprising 1,N,N,N',N'-pentakis(1,1'-biphenyl-4-yl)-phenylene-3,5-diamine matrix compound and to new 1,N,N,N',N'-pentakis(1,1'-biphenyl-4-yl)-phenylene-3,5-diamine compound useful especially as hole-transporting and/or electron-blocking layer matrix in OLEDs.