Iridium Complex Compound for Red Light Emission
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Solution Overview
Problem
Conventional red-luminescence phosphorescent materials, such as phenyl(iso)quinoline-based iridium complexes, have low solubility in organic solvents and poor stability during wet film formation, limiting their use in organic electroluminescent elements, while phenylquinazoline-based materials suffer from short working life and low electrical durability.
Innovation Solution
Development of an iridium complex compound incorporating a 2-phenylquinazoline ligand with specific substituents, which emits red light and forms a stable organic electroluminescent element with improved solubility and long working life, utilizing a composition suitable for coating fluid application methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phenyl(iso)quinoline-based iridium complexes are used as phosphorescent materials, then red light emission is achieved, but solubility in organic solvents is low and stability during wet film formation is poor
Solution Approach 1:
The patent modifies the chemical structure of the iridium complex by changing the ligand parameters - specifically using 2-phenylquinazoline-based ligands with controlled substituents instead of conventional phenyl(iso)quinoline ligands. This parameter change in the molecular structure improves solubility in organic solvents while maintaining red light emission properties and enhancing stability during wet film formation processes.
Solution Approach 2:
The invention creates a composite phosphorescent material system by combining iridium center with specifically designed 2-phenylquinazoline-based ligands containing electron-withdrawing groups. This composite structure achieves a balance between solubility, stability, and luminescent properties that neither component could achieve alone.
2Stability of the object's composition
If phenylquinazoline-based phosphorescent materials are used, then solubility in organic solvents is improved, but working life is short and electrical durability is low
Solution Approach 1:
The patent optimizes the ligand structure by selecting specific electron-withdrawing groups (such as fluorine, chlorine, cyano, or carbonyl groups) at defined positions on the 2-phenylquinazoline ring. This parameter optimization enhances the electronic properties and molecular stability, thereby improving working life and electrical durability while preserving good solubility characteristics.
3Reliability
If vacuum deposition method is used to form organic EL element layers, then phosphorescent materials can be deposited, but the deposition process is troublesome and production efficiency is poor
Solution Approach 1:
The invention replaces the mechanical vacuum deposition process with a chemical solution-based coating method. The improved solubility of the iridium complex in organic solvents enables the use of spin coating, dip coating, or spray coating techniques, which are simpler, faster, and more suitable for mass production while maintaining reliable layer formation.
4Reliability
If vacuum deposition method is used, then layers can be formed, but it is extremely difficult to increase the size of the panels
Solution Approach 1:
By substituting vacuum deposition with solution-based coating methods, the invention enables scalable production of large-area organic EL panels. These coating techniques can be applied to large substrates and are compatible with roll-to-roll processing, thereby overcoming the size limitations of vacuum deposition while maintaining layer quality.
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 enhances the solubility and stability of the organic electroluminescent element, leading to a longer working life and higher electrical durability, making it suitable for display and lighting devices.
Implementation Method 1
it has been proposed, for example, to utilize the phenomenon wherein the recombination of holes with electrons yields singlet excitons and triplet excitons in a ratio of 1:3 and to utilize a phosphorescent material in the luminescent layer of an organic EL element
Implementation Method 2
various electronic devices which utilize organic electroluminescent elements
Data Source
AI summary
The object of the present invention is to provide an iridium complex compound emitting red light, a composition comprising the iridium complex compound and a solvent, an organic electroluminescent element which is produced using the compound or the composition and has a long driving life and an excellent electronic durability, and a display device and lighting device using the organic electroluminescent element. The present invention relates to an iridium complex compound solvent having a 2-phenyl quinazoline framework and a specific substituent.