Terminal-Modified Polyphenylene Oxide for Organic EL Devices
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Solution Overview
Problem
Organic electroluminescence (EL) devices face challenges in being driven at low voltage and maintaining long life due to issues with hydroxyl groups in polyphenylene oxide, which deteriorate device properties.
Innovation Solution
Incorporating a polymer with a specific formula in at least one organic thin film layer, which includes terminal modification to improve device properties, and using an ink composition comprising this polymer and an organic semiconductor material for the production of organic EL devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyphenylene oxide is used without terminal modification, then the device structure is simple and manufacturing is easier, but hydroxyl groups remain which deteriorate organic EL properties
Solution Approach 1:
The patent applies preliminary action by performing terminal modification on polyphenylene oxide before using it in the organic EL device. The hydroxyl groups at the terminals are modified with organic groups in advance to prevent them from deteriorating the EL properties during device operation, thus resolving the contradiction between ease of manufacture and device reliability.
2Reliability
If terminal modification is conducted on polyphenylene oxide, then organic EL properties are improved and device life is extended, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure parameters of polyphenylene oxide through terminal modification. By changing the terminal groups from hydroxyl to organic groups, the device life and EL properties are improved while maintaining a manageable manufacturing process.
3Device complexity
If conventional organic layers are used, then the device structure is straightforward, but the device requires high driving voltage and has short life
Solution Approach 1:
The patent applies composite materials by using polyphenylene oxide with terminal modification as a hole-transporting layer in combination with other organic layers. This composite structure achieves both straightforward device architecture and improved device life, resolving the contradiction between structural simplicity and reliability.
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 solution enables organic EL devices to be driven at lower voltages and extends their lifespan, while providing a novel ink composition for efficient device production.
Implementation Method 1
An organic electroluminescence (EL) device is a self-emitting device utilizing a principle that a fluorescent substance emits light by recombination energy of holes injected from an anode and electrons injected from a cathode by application of an electrical field.
Data Source
AI summary
An organic electroluminescence device including: an anode and a cathode; and at least one organic thin film layer between the anode and the cathode, wherein one of the organic thin film layer(s) comprises a polymer represented by the following formula (1).