Polymer Compound for Organic EL Film Formation and Efficiency
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Solution Overview
Problem
Current polymer organic electroluminescence devices have low emission efficiency and short lifetime compared to those using low molecular weight compounds, and there is a need for a polymer compound that can form a uniform thin film with high charge transporting ability.
Innovation Solution
A polymer compound comprising specific repeating units, such as those represented by formulas (1-1) or (1-2), which can be used as a hole transporting material to form a uniform thin film, enhancing the efficiency and lifetime of organic electroluminescence devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polymer compound is used as a light emitting organic compound in an organic electroluminescence device, then the device can be formed by coating or printing method and is advantageous for producing large-sized TV panels and flexible sheet displays, but the emission efficiency is low compared to devices employing low molecular weight compounds
Solution Approach 1:
The patent modifies the chemical structure parameters of the polymer compound by introducing specific repeating units with formula (1-1) or (1-2) containing aryl groups (Ar1-Ar4) and various substituent groups (R1-R6). This structural parameter change improves charge transporting ability while maintaining the polymer's processability by coating or printing methods, thereby resolving the contradiction between ease of manufacture and emission efficiency.
2Adaptability or versatility
If a polymer compound is used as a light emitting organic compound in an organic electroluminescence device, then patterning by printing method is enabled and is advantageous for producing large-sized TV panels and flexible sheet displays, but the lifetime is short compared to devices employing low molecular weight compounds
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer by incorporating specific repeating units with formula (1-1) or (1-2) that enhance charge transporting ability. This structural modification improves both the patterning capability through printing methods and the device lifetime by reducing degradation, thus resolving the contradiction between adaptability and duration of action.
3Manufacturing precision
If a low molecular weight compound is used as a light emitting organic compound, then the thin film can be formed by vacuum vapor deposition method, but the production efficiency is not high and large-sized substrate is difficult to use and the mechanical strength and heat stability of the thin film are poor
Solution Approach 1:
The patent extracts the light emitting function from the polymer backbone and places it in side chains or pendant groups, while the polymer backbone provides mechanical strength and processability. This separation allows the use of coating or printing methods for high-efficiency production on large substrates while maintaining thin film formation quality, resolving the contradiction between manufacturing precision and productivity.
Data Source
AI summary
A polymer compound which includes repeating units represented by formula (1-1) or (1-2) and an organic EL device including the polymer compound as an organic layer are provided:wherein each of R1 to R6 independently represents a linear or branched alkyl group having 1 to 20 carbon atoms, a linear or branched alkoxy group having 1 to 20 carbon atoms, a linear or branched alkylthio group having 1 to 20 carbon atoms, a linear or branched alkenyl group having 2 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 30 ring carbon atoms, or a heteroaryl group having 5 to 30 ring atoms; each of a and b independently represents an integer of 0 to 4; each of c and d independently represents an integer of 0 to 3; and each of Ar1, Ar2, Ar3, and Ar4 independently represents a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms.