Iridium Complex for Low-Voltage OLED Coating
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Solution Overview
Problem
Current organic electroluminescent elements produced by the coating method using iridium complexes have limitations in terms of high driving voltage and low luminescent efficiency, and there is a lack of discussion on the pot life of compositions containing iridium complexes, which hinders industrial mass production.
Innovation Solution
An iridium complex compound with a specific chemical structure that is highly soluble in organic solvents like toluene or phenylcyclohexane, allowing for long-term storage without precipitation, and enables the production of organic electroluminescent elements with low driving voltage and high luminescent efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a coating method is used to produce organic EL elements, then productivity is improved and large-size panels can be manufactured, but the driving voltage becomes high and luminescent efficiency becomes low
Solution Approach 1:
The patent modifies the chemical structure parameters of the iridium complex by introducing specific substituents (combinations of formulae (1) and (2)) to optimize both solubility for coating processing and electroluminescence performance, thereby achieving low driving voltage and high efficiency while maintaining coating method productivity
2Ease of manufacture
If a coating method is used to produce organic EL elements, then ease of manufacture is improved, but luminescent efficiency becomes low
Solution Approach 1:
The patent optimizes the chemical structure parameters of the iridium complex (formulae (1) and (2)) to achieve both high solubility for easy coating manufacturing and high luminescent efficiency, resolving the contradiction between ease of manufacture and performance reliability
3Ease of manufacture
If an iridium complex is dissolved in organic solvent for coating method, then film formation is improved, but the composition has short pot life due to reprecipitation
Solution Approach 1:
The patent modifies the solubility parameters of the iridium complex through specific structural design (formulae (1) and (2)) to achieve long-term stable dissolution in organic solvents without reprecipitation, thereby extending pot life while maintaining good film formation properties
Solution Approach 2:
The patent creates a stable composite solution by combining the specifically structured iridium complex with organic solvents, where the molecular structure design ensures compatibility and prevents precipitation, achieving both good film formation and extended stability
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 iridium complex compound ensures stable and efficient production of organic electroluminescent elements with reduced driving voltage and improved luminescent performance, suitable for industrial-scale production and application in displays and lighting.
Implementation Method 1
As the phosphorescent material, for example, widely known are ortho-metallized iridium complexes such as typically bis(2-phenylpyridinato-N,C2')iridium acetylacetonate (Irppy 2 (acac)) and tris(2-phenylpyridinato-N,C2')iridium (Ir(ppy) 3 ).
Data Source
Figure 1~2
AI summary
The present invention is to provide an iridium complex compound, which is soluble in an organic solvent, which can be stored for long periods without reprecipitation thereof and which secures a low driving voltage and a high luminescent efficiency of an organic electroluminescent element produced using the compound, to provide an organic electroluminescent element containing the compound and to provide a display and a lighting using the organic electroluminescent element. The present invention relates to the iridium complex compound having a specific chemical structure. Further, the invention also relates to the organic electroluminescent element produced using the compound, which requires a low operating voltage and has a long operating lifetime.