OLED Electron Transport Layer Nitrogen-Rich Compound Design
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Solution Overview
Problem
The lifetime and efficiency of organic light emitting display devices are limited by the materials used and their stacked structure, requiring improvements to enhance performance and reduce operating voltage.
Innovation Solution
Incorporating an organic layer with a compound that includes a functional group with three or more nitrogen atoms, a bridge connected to the functional group, and a substituent at the meta position of the bridge, which maximizes triplet-triplet annihilation and improves electron mobility, reducing the energy bandgap and operating voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic materials are used in the electron transport layer, then the device structure is simple, but the efficiency and lifetime are limited
Solution Approach 1:
The patent changes the chemical parameters of the organic material by introducing a functional group with three or more nitrogen atoms and a substituent at the meta position of the bridge. This parameter change in molecular structure increases electron mobility and maximizes triplet-triplet annihilation, thereby improving device efficiency and lifetime without complicating the overall device architecture
Solution Approach 2:
The patent employs a composite organic material combining a functional group with multiple nitrogen atoms, a bridge structure, and a substituent at the meta position. This composite molecular design achieves high electron mobility and optimized triplet-triplet annihilation, improving device performance while maintaining structural simplicity
2Productivity
If conventional organic materials are used in the electron transport layer, then the material structure is simple, but the efficiency is limited
Solution Approach 1:
The patent modifies the molecular parameters by incorporating a functional group with three or more nitrogen atoms and positioning a substituent at the meta position of the bridge. These parameter changes enhance electron mobility and optimize triplet-triplet annihilation, significantly improving device efficiency while keeping the material structure relatively simple
Solution Approach 2:
The patent introduces a specific local structural feature - the substituent at the meta position of the bridge connected to the multi-nitrogen functional group. This local structural optimization maximizes triplet-triplet annihilation and electron mobility, improving overall device efficiency without requiring complex global structural changes
3Power
If conventional organic materials are used in the electron transport layer, then the operating voltage is higher, but the material selection is broader
Solution Approach 1:
The patent changes the electronic parameters of the organic material by introducing a functional group with three or more nitrogen atoms and a meta-positioned substituent on the bridge. These parameter changes reduce the energy bandgap, thereby lowering the operating voltage while maintaining reasonable material selection flexibility
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 configuration enhances the efficiency and lifetime of the organic light emitting display devices, reduces operating voltage, and lowers manufacturing costs by using a single material for the electron transport layer, while maintaining high electron mobility and aromaticity.
Implementation Method 1
The substituent maximizes the effect of triplet-triplet annihilation by breaking a conjugation of the compound
Implementation Method 2
the at least one organic layer comprises a compound that includes a functional group having at least three or more nitrogen atoms that has high electron mobility
Implementation Method 3
An exciton is formed by the recombination of electrons and holes injected from the two electrodes, causing luminescent materials to emit fluorescent or phosphorescent light
Implementation Method 4
Ar includes a substituted or unsubstituted heteroaromatic group having 1 to 3 nitrogen atoms that has a molecular weight of 400 or less
Data Source
AI summary
An organic light emitting display device is disclosed. The organic light emitting display device comprising at least one light emitting part between an anode and a cathode and comprising at least one organic layer and a light emitting layer, wherein the at least one organic layer comprises a compound that includes a functional group having at least three or more nitrogen atoms and has high electron mobility, a bridge connected to the functional group, and a substituent substituted at a meta position of the bridge.