Monoamine OLED Material for Charge Transport and Recombination
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Solution Overview
Problem
Current organic electroluminescent devices lack compounds that significantly enhance their performance in terms of efficiency, particularly in transporting electrons or holes and facilitating their recombination for improved light emission.
Innovation Solution
A monoamine compound with a 1-dibenzofuranyl or 1-dibenzothiophenyl structure bonded to a central nitrogen atom via a p-phenylene group, which forms the basis of a new material for organic electroluminescent devices, enhancing electron and hole transport and recombination efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hole transporting materials are used, then the device structure is simple, but the efficiency of electron and hole transport and recombination is insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure parameters of hole transporting materials. Specifically, it introduces monoamine compounds with dibenzofuranyl and dibenzothiophenyl groups at defined positions (1-position) to optimize electron mobility, hole mobility, and recombination efficiency parameters while maintaining reasonable structural complexity
Solution Approach 2:
The patent employs composite materials by combining different functional groups (dibenzofuranyl, dibenzothiophenyl, and amine groups) into a single monoamine compound structure. This composite approach allows the material to simultaneously provide hole transporting capability and enhanced electron transport properties, improving overall device efficiency
2Reliability
If compounds with enhanced transport properties are developed, then the light emission efficiency improves, but the synthesis complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the molecular structure into distinct functional segments: the central nitrogen atom (amine group), the dibenzofuranyl/dibenzothiophenyl aromatic cores, and the p-phenylene linking groups. This segmented structure allows for systematic optimization of transport properties while using well-established synthetic building blocks that can be assembled through standard organic synthesis methods
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 new compound significantly improves the efficiency of organic electroluminescent devices by facilitating better electron and hole transport and recombination, leading to enhanced light emission performance.
Implementation Method 1
it is important for obtaining an organic EL device with a high efficiency to develop a compound that transports electrons or holes into the light emitting region efficiently
Implementation Method 2
The injected electrons recombine with the injected holes in the light emitting region to form excited states. When the excited states return to the ground state, energy is released as light
Implementation Method 3
When the excited states return to the ground state, energy is released as light
Data Source
AI summary
Provided are a compound capable of more improving the performance of organic EL devices, an organic electroluminescent device having a more improved device performance, and an electronic device including such an organic electroluminescent device; precisely, a compound represented by the following formula (1) wherein X1, X2, X3, L, R1 to R3, R5 to R8, R11 to R13, R15 to R18, R21 to R24, and R25 to R28 are as defined in the description, an organic electroluminescent device containing the compound, and an electronic device including such an organic electroluminescent device.