Diels-Alder Crosslinkable Polymer for OLED Device Lifetime
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Solution Overview
Problem
Current crosslinkable polymer optoelectronic materials for solution-processed OLEDs have limitations in device lifetime and performance, necessitating the development of new high-performance charge transporting materials.
Innovation Solution
A crosslinkable polymer mixture based on a Diels-Alder reaction, comprising a conjugated polymer with conjugated diene and dienophile functional groups, which forms a three-dimensional insoluble and infusible network upon heating or acid catalysis, offering excellent solvent resistance and enabling efficient solution processing for multilayer optoelectronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional crosslinking methods (heating, illumination) are used to improve solvent resistance, then device lifetime is improved, but processing time and temperature increase
Solution Approach 1:
The patent changes the chemical parameters of the crosslinking reaction by introducing Diels-Alder reactive groups (conjugated diene and dienophile) that react at lower temperatures and shorter times compared to conventional crosslinking methods, thereby reducing processing time while maintaining device lifetime
Solution Approach 2:
The patent uses a composite polymer structure combining conjugated diene units and dienophile units in the same polymer chain, enabling intramolecular crosslinking that proceeds faster and at lower temperatures than conventional intermolecular crosslinking methods
2Ease of manufacture
If solution processing method is used to prepare multilayer devices, then manufacturing cost is reduced and large-area application is enabled, but interface miscibility and interface corrosion occur
Solution Approach 1:
The patent applies preliminary crosslinking action to the first layer before applying subsequent layers. The crosslinking groups in the first layer react to form a solvent-resistant network structure before the second layer is deposited, preventing solvent from the second layer from dissolving or corroding the first layer interface
Solution Approach 2:
The patent inverts the conventional sequence by crosslinking the first layer in situ before depositing the second layer, rather than crosslinking after complete device assembly. This reversal prevents interface corrosion by establishing solvent resistance before subsequent solvent processing steps
3Stability of the object's composition
If crosslinking groups are introduced to improve solvent resistance, then interface miscibility is prevented, but device lifetime is limited
Solution Approach 1:
The patent creates a composite polymer structure with conjugated diene and dienophile units that enable Diels-Alder crosslinking, forming a three-dimensional network that provides both excellent solvent resistance and enhanced device lifetime through improved interfacial stability
Solution Approach 2:
The patent changes the chemical reactivity parameters by using Diels-Alder crosslinking groups that form stable crosslinked structures at lower temperatures and shorter times, improving both solvent resistance and device lifetime without the degradation issues associated with conventional high-temperature crosslinking
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 Diels-Alder reaction allows for the formation of a polymer film with enhanced optical and electrical properties, improved solvent resistance, and reduced processing time and temperature, facilitating the production of high-performance multilayer polymer optoelectronic devices with extended device lifetime.
Implementation Method 1
a crosslinkable mixture constructed based on a Diels-Alder reaction... the conjugated diene functional group and the dienophile functional group can undergo a Diels-Alder reaction
Implementation Method 2
undergo a Diels-Alder reaction to crosslink... under heating or acid catalysis
Data Source
AI summary
Provided is a mixture which can be subjected to a Diels-Alder reaction, comprising polymer (I) and polymer (II), wherein the structures of the polymer (I) and the polymer (II) are as shown in (I),wherein x1, y1, x2, y2, z1 and z2 are percentage molar contents; said x1 is >0, x2 is >0, y1 is >0, y2 is >0, z1 is ≥0, and z2 is ≥0; x1+y1+z1=1, and x2+y2+z2=1; Ar1, Ar2, Ar2-1, Ar3, Ar4 and Ar4-1 are each independently selected from: an aryl, or heteroaryl group containing 5-40 ring atoms; R1 and R2 are each independently a linking group; D is a conjugated diene functional group, and A is a dienophilic functional group; and n1 is greater than 0, and n2 is greater than 0. The mixture for a Diels-Alder reaction has a very good optical performance.