Iridium Complex Copolymer for Large-Area Organic EL Devices
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Solution Overview
Problem
Current organic electroluminescence (EL) devices face challenges in achieving high luminance brightness and durability for red to orange light emission, particularly in large-area devices, and the manufacturing process is complex due to the need for vacuum vapor deposition and potential non-uniform film thickness.
Innovation Solution
A light-emitting polymer material comprising a copolymer with a structural unit derived from an iridium complex, specifically designed for high luminance brightness and efficiency, which can be formed using a simpler coating method, allowing for large-area devices with improved durability and simplified manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum vapor deposition method is used to form light emitting layer, then film can be formed, but vacuum unit is required and film thickness becomes non-uniform in large-area devices
Solution Approach 1:
The patent replaces the mechanical vacuum vapor deposition system with a chemical solution coating method. The light emitting layer is formed by coating a solution containing the iridium complex and polymer onto the substrate, then drying it. This substitution eliminates the need for vacuum equipment and achieves uniform film thickness in large-area devices through solution processing.
2Reliability
If small light-emitting molecule is used, then phase separation or segregation occurs, but polymer material is needed to prevent this
Solution Approach 1:
The patent creates a composite material system where the iridium complex is combined with a polymer through coordination bonding. The iridium complex contains ligands with coordinating groups that bind to metal atoms in the polymer chain, forming a stable composite structure. This composite approach prevents phase separation while maintaining the light-emitting properties of the iridium complex.
Solution Approach 2:
The patent uses coordinating groups (such as beta-diketonate or pyridine ligands) as intermediaries between the iridium complex and the polymer chain. These intermediary groups facilitate stable binding between the small light-emitting molecule and the polymer matrix, preventing segregation while maintaining molecular integrity.
3Loss of energy
If copolymerization of light emitting compound with hole transport compound and electron transport compound is performed, then luminous efficiency improves, but manufacturing process becomes more complex
Solution Approach 1:
The patent merges multiple functions into a single copolymer structure. The copolymer contains structural units derived from the light emitting iridium complex, hole transport compounds, and electron transport compounds. This merging allows all three components to be incorporated into one material that can be processed as a single solution, simplifying manufacturing while maintaining high luminous efficiency through improved charge recombination.
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 polymer material achieves high luminance brightness and efficiency in red to orange light emission, enabling the production of durable, large-area organic EL devices with a simplified manufacturing process, overcoming the limitations of existing technologies.
Implementation Method 1
light emitting polymer material comprising a (co) polymer comprising a structural unit derived from an iridium complex, which is capable of highly efficiently emitting red to orange light with a high luminance brightness
Data Source
Figure 1
AI summary
Disclosed is a light emitting polymer material comprising a (co)polymer comprising a structural unit derived from an iridium complex represented by the following formula (1): wherein R1 and R2 each independently represents an atom or a substituent selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, an alkyl group of 1 to 10 carbon atoms, an aryl group of 6 to 10 carbon atoms, an amino group which may be substituted with an alkyl group of 1 to 10 carbon atoms, an alkoxy group of 1 to 10 carbon atoms, and a silyl group; X1 represents a polymerizable functional group-containing substituent; and A1 to A3 each independently represents a divalent substituent having a cyclic structure.