Cyano-Containing Aromatic Electron Transport Material for Organic EL Devices
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Solution Overview
Problem
Existing organic electroluminescence (EL) devices face challenges in improving drive voltage, luminous efficiency, and durability, particularly when attempting to combine multiple materials for electron-injecting/transporting layers, which complicates the production process and may not achieve optimal performance.
Innovation Solution
An organic EL device structure incorporating an electron-transporting material with a cyano group and an aromatic ring group, specifically designed to include a monocyclic or fused aromatic ring, which serves as a single material for the electron-transporting layer, reducing the need for multiple components and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple materials are combined for electron-injecting/transporting layers, then device performance is improved, but production process complexity increases
Solution Approach 1:
The patent combines electron-injecting and electron-transporting functions into a single material by incorporating both nitrogen-containing heterocyclic groups (for electron injection) and aromatic hydrocarbon groups (for electron transport and hole resistance) into one molecular structure. This eliminates the need for separate layers or multiple materials, simplifying the production process while maintaining improved device performance.
Solution Approach 2:
The electron-transporting material of the invention performs multiple functions simultaneously: it provides electron injection capability through nitrogen-containing heterocyclic groups, electron transport through aromatic hydrocarbon groups, and adequate hole resistance. This multi-functional material replaces what would traditionally require multiple separate materials and layers.
2Power
If metal complex is used in combination with aromatic hydrocarbon compound, then drive voltage is reduced, but production process becomes complex
Solution Approach 1:
The patent merges the functions of metal complexes (which reduce drive voltage) and aromatic hydrocarbon compounds (which provide electron transport) into a single organic compound. The molecular structure incorporates both the electron-transporting aromatic hydrocarbon framework and the electron-injecting nitrogen-containing heterocyclic groups, eliminating the need for separate metal complex layers and simplifying production.
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 use of a cyano-containing aromatic ring group electron-transporting material allows for a low drive voltage, high efficiency, and extended lifetime in organic EL devices, simplifying the layer formation process and improving overall device performance.
Implementation Method 1
an electron-transporting region (30), the electron-transporting region including an electron-transporting material that includes a cyano group and an aromatic ring group
Implementation Method 2
The electrons and the holes recombine in the emitting layer to produce an excited state, and the energy is emitted as light when the excited state returns to the ground state
Data Source
AI summary
An organic electroluminescence device sequentially includes an anode, an emitting layer, an electron-transporting region, and a cathode, the electron-transporting region including an electron-transporting material that includes a cyano group and an aromatic ring group.