Polymer Compound Hydroxyl Reduction for Light-Emitting Device Luminance Life
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Solution Overview
Problem
Light emitting devices produced using polymer compounds from existing methods do not have sufficient luminance life.
Innovation Solution
A method for producing a polymer compound with reduced hydroxyl group content, achieved through Suzuki-polymerization of specific compounds under controlled oxygen conditions, resulting in a polymer compound with improved luminance life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer compounds are produced by conventional condensation polymerization methods, then the polymer compound can be formed with basic functionality, but the hydroxyl group content remains high which reduces luminance life
Solution Approach 1:
The patent applies parameter changes by modifying the polymerization conditions specifically controlling oxygen concentration below 0.2% and adjusting reaction temperature and catalyst selection to minimize hydroxyl group formation during Suzuki polycondensation, thereby achieving hydroxyl group content below 0.02 mol% while maintaining polymer functionality
Solution Approach 2:
The patent implements an inert atmosphere by conducting the polymerization reaction under controlled oxygen conditions with oxygen concentration maintained below 0.2%, creating an oxygen-limited environment that prevents oxidation reactions that would otherwise generate hydroxyl groups, thus improving luminance life
2Manufacturing precision
If oxygen concentration is controlled below 0.2% during polymerization, then hydroxyl group content is reduced to less than 0.02 mol%, but the manufacturing process complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing an oxygen-controlled atmosphere before initiating polymerization and maintaining it throughout the reaction process. This preventive approach ensures hydroxyl group content stays below 0.02 mol% without requiring complex post-processing or monitoring systems during manufacturing
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 method produces a polymer compound that enhances the luminance life of light emitting devices by reducing hydroxyl group content, leading to improved performance and stability.
Implementation Method 1
a method for producing a polymer compound which comprises a constitutional unit represented by formula (1) and a constitutional unit represented by formula (X) and/or a constitutional unit represented by formula (Y)... wherein the content of hydroxyl groups... is less than 0.02 mol%
Data Source
Figure 1
AI summary
A polymer compound comprising a constitutional unit represented by the following formula (1) and a constitutional unit represented by the following formula (X) and/or a constitutional unit represented by the following formula (Y), wherein the content of the hydroxyl groups contained in the polymer compound is less than 0.02 mol%: [wherein, Ar1 represents an arylene group and this group optionally has a substituent.] [wherein, aX1 and aX2 each independently represent an integer of 0 or more. ArX1 and ArX3 each independently represent an arylene group or a divalent heterocyclic group and these groups each optionally have a substituent. ArX2 and ArX4 each independently represent an arylene group, a divalent heterocyclic group or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are bonded directly to each other, and these groups each optionally have a substituent. When there are a plurality of ArX2 and a plurality of ArX4, each of them may be the same or different. RX1, RX2 and RX3 each independently represent an alkyl group, an aryl group or a monovalent heterocyclic group and these groups each optionally have a substituent. When there are a plurality of RX2 and a plurality of RX3, each of them may be the same or different.] [wherein, ArY1 represents an arylene group, a divalent heterocyclic group or a divalent group in which at least one arylene group and at least one divalent heterocyclic group are bonded directly to each other, and these groups each optionally have a substituent.].