Phenyl Pyridine Polymers for OLED Stability
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Solution Overview
Problem
Current Organic Light Emitting Devices (OLEDs) face stability and feasibility issues, limiting their popularity, and there is a need for more suitable materials to enhance their performance.
Innovation Solution
Development of polymers comprising phenyl pyridine units, which are synthesized by polymerizing or copolymerizing phenyl pyridine monomers with other comonomers to create random, block, or graft copolymers, suitable for use in OLEDs as electron transporting, hole transporting, or light emitting layers, utilizing specific reaction conditions and solvents to achieve desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used in OLEDs, then the device structure is established, but stability and feasibility issues arise
Solution Approach 1:
The patent changes the chemical parameters of the materials by introducing specific phenyl pyridine structural units with different substituents (R1, R2, R3, R4 groups) to improve both stability and feasibility of OLED manufacturing
Solution Approach 2:
The patent creates composite polymer materials combining phenyl pyridine units with various functional groups (electron transporting, hole transporting, light emitting) to achieve both improved stability and manufacturing feasibility in OLED devices
2Reliability
If more suitable materials are provided for OLEDs, then efficiency and stability improve, but material synthesis complexity increases
Solution Approach 1:
The patent segments the material design into modular phenyl pyridine units with specific functional groups (electron transporting, hole transporting, light emitting) that can be independently designed and combined to achieve desired device performance
Solution Approach 2:
The phenyl pyridine-based polymers are designed to perform multiple functions simultaneously (electron transport, hole transport, light emission) within a single material system, reducing the need for multiple specialized materials and simplifying device structure
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 resulting polymers improve the efficiency and stability of OLEDs, enabling their use in both multi-layered and single-layered devices, including phosphorescent OLEDs with blue, yellow, orange, or red phosphorescent dyes, enhancing their performance and potential applications.
Implementation Method 1
polymers comprising structural unit of formula I and/or II. The polymers are prepared by polymerizing phenyl pyridine monomers or copolymerizing phenyl pyridine monomers with one or more comonomers
Data Source
AI summary
The invention relates to a polymer comprising structural unit of formula II wherein R1, R2, R3, R4, R5, R6 and R7 are independently at each occurrence a C1-C20 aliphatic radical, a C3-C20 aromatic radical, or a C3-C20 cycloaliphatic radical; a, b, d, e and f are independently at each occurrence 0, or an integer ranging from 1 to 4; c and g are independently at each occurrence 0, or an integer ranging from 1 to 3. In another aspect, the invention relates to monomers for preparing the polymers. In yet another aspect, the invention relates to an optical electronic device comprising a polymer comprising structural unit of formula II.