Indolocarbazole Polymer for Inkjet Printed Light Emitting Devices
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Solution Overview
Problem
Light emitting devices produced using existing polymer compounds have insufficient light emission efficiency, and the yield of indrocarbazole compounds used in their production is not optimal.
Innovation Solution
A polymer compound comprising specific constitutional units, including an indrocarbazole unit and an arylene or divalent heterocyclic unit, is developed, along with a production method that enhances the yield and light emission efficiency of the indrocarbazole compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polymer compound comprising an indrocarbazole constitutional unit and an arylene constitutional unit is used in a light emitting device, then the device can be produced by application methods such as inkjet printing, but the light emission efficiency is insufficient
Solution Approach 1:
The patent modifies the chemical structure parameters of the indrocarbazole compound by introducing specific substituents (Ra, Rb, Rc, Rd as alkyl groups) and combining it with arylene units in defined molar ratios (0.1-50 mol% indrocarbazole units). These parameter changes optimize both the processability for inkjet printing and the light emission efficiency of the polymer compound.
Solution Approach 2:
The invention creates a composite polymer structure by combining indrocarbazole constitutional units with arylene constitutional units in a copolymer system. This composite approach allows the material to simultaneously exhibit good processability for solution-based fabrication and enhanced light emission properties through synergistic molecular interactions.
2Ease of manufacture
If a halogenated aryl compound and a secondary amine compound undergo Ullmann reaction in the presence of a copper catalyst, base and solvent, then an indrocarbazole compound can be produced, but the yield is not necessarily sufficient
Solution Approach 1:
The patent optimizes the Ullmann reaction parameters by specifying particular base types (alkali metal hydroxides, alkoxides, or carbonates), solvent choices (polar aprotic solvents), temperature ranges (60-150°C), and catalyst amounts (0.01-5 mol% relative to halogenated aryl compound). These parameter optimizations significantly improve the reaction yield while maintaining ease of manufacture.
Solution Approach 2:
The invention uses a copper catalyst as an intermediary to facilitate the coupling reaction between halogenated aryl compounds and secondary amine compounds. The copper catalyst mediates the formation of the indrocarbazole structure, enabling the reaction to proceed with higher efficiency and yield under milder conditions.
Data Source
AI summary
Provided is a polymer compound which is useful for production of a light emitting device excellent in light emission efficiency is provided. The polymer compound contains a constitutional unit represented by the formula (1) and a constitutional unit represented by the formula (Y) as follows:wherein R1 to R8 represent a hydrogen atom, an alkyl group, an aryl group or the like, and RA and RB represent an aryl group or a monovalent heterocyclic group, andArY1 (Y)wherein ArY1 represents an arylene group or the like.