Iridium Complex Red Phosphor for OLED Efficiency
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Solution Overview
Problem
Phenyl(iso)quinoline-based and phenylquinazoline-based red-phosphorescent materials used in organic electroluminescent elements have low luminescent quantum yields, resulting in low luminescent efficiency in display devices and illuminators.
Innovation Solution
An iridium complex compound with a phenyl(iso)quinoline or phenylquinazoline ligand and a phenylazole ligand is developed, which emits red light with a high luminescent quantum yield, improving the luminescent efficiency of organic electroluminescent elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phenyl(iso)quinoline-based or phenylquinazoline-based red-phosphorescent materials are used in organic electroluminescent elements, then the device can emit red light, but the luminescent quantum yield is low resulting in low luminescent efficiency
Solution Approach 1:
The patent changes the chemical parameters of the phosphorescent material by introducing specific ligand combinations (phenylazole ligands with phenyl(iso)quinoline or phenylquinazoline ligands coordinated to iridium). This chemical parameter change transforms the material's photophysical properties, achieving high luminescent quantum yield (60% or higher) and high luminescent efficiency while maintaining red light emission.
2Ease of manufacture
If conventional red-phosphorescent materials are used, then the organic electroluminescent element can be manufactured, but the luminescent efficiency remains low
Solution Approach 1:
The patent creates a composite phosphorescent material by combining specific ligands (phenylazole with phenyl(iso)quinoline or phenylquinazoline) coordinated to an iridium center. This composite structure leverages the synergistic effects of different molecular components to achieve both manufacturability through conventional processes and high luminescent efficiency (60% or higher quantum yield).
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 luminescent efficiency of organic electroluminescent elements, making them suitable for high-performance display devices and illuminators.
Implementation Method 1
an iridium complex compound which emits phosphorescent red light with a high luminescent quantum yield
Data Source
Figure 1
AI summary
The object of the invention is to provide an iridium complex compound which emits red light with a high luminescent quantum yield, a process for producing the compound, an organic electroluminescent element which employs the iridium complex compound and has a high luminescent efficiency, a display device, and an illuminator. The present invention relates to an iridium complex compound represented by the following formula (1), which contains a phenyl(iso)quinoline or phenylquinazoline ligand and a phenylazole ligand: