Meta-Phenylene Iridium Complexes for Soluble, Long-Life OLEDs
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Solution Overview
Problem
Existing organic electroluminescent elements face challenges in achieving high solubility in solvents, maintaining a uniform state without precipitation, and balancing luminous efficiency and operating lifetime, particularly with iridium complex compounds used in light-emitting layers.
Innovation Solution
Development of an iridium complex compound with a specific chemical structure, represented by formula (1), which enhances solubility and disperses electron density to prevent oxidation, allowing for high concentration use in light-emitting layers, improving luminous efficiency and operating lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the concentration of the light-emitting material is increased to prolong operating lifetime, then the operating lifetime is improved, but the solubility requirement becomes more stringent and harder to satisfy
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the iridium complex compound, specifically introducing meta-phenylene groups and adjusting ligand configurations. These structural parameter changes enhance the solubility of the compound in organic solvents, enabling higher concentrations to be achieved without precipitation, thus allowing extended operating lifetime through increased material concentration.
Solution Approach 2:
The patent employs composite materials by designing an iridium complex compound with multiple functional components: the iridium center, phenyl-pyridine type ligands, and meta-phenylene groups. This composite molecular structure combines the phosphorescence emission properties of iridium with the solubility-enhancing meta-phenylene groups, achieving both high luminous efficiency and high solubility simultaneously.
2Productivity
If a wet film-forming method is used to improve productivity and enable large-sized displays, then productivity is improved, but the material must dissolve quickly and maintain uniform state without precipitation
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the iridium complex compound, specifically introducing meta-phenylene groups and adjusting ligand configurations. These structural parameter changes enhance the solubility of the compound in organic solvents, enabling higher concentrations to be achieved without precipitation, thus allowing extended operating lifetime through increased material concentration.
Solution Approach 2:
The patent applies preliminary action by designing the molecular structure with meta-phenylene groups that pre-establish good solubility characteristics. This preliminary structural design ensures that the material dissolves quickly and maintains a uniform state during the wet film-forming process, preventing precipitation before film formation can occur.
3Power
If conventional iridium complex compounds are used to achieve high luminous efficiency, then luminous efficiency is improved, but solubility is poor and requires long heating periods that cause deterioration
Solution Approach 1:
The patent employs composite materials by designing an iridium complex compound with multiple functional components: the iridium center, phenyl-pyridine type ligands, and meta-phenylene groups. This composite molecular structure combines the phosphorescence emission properties of iridium with the solubility-enhancing meta-phenylene groups, achieving both high luminous efficiency and high solubility simultaneously.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical structure of the iridium complex compound, specifically introducing meta-phenylene groups and adjusting ligand configurations. These structural parameter changes enhance the solubility of the compound in organic solvents, enabling higher concentrations to be achieved without precipitation, thus allowing extended operating lifetime through increased material concentration.
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 achieves high solubility, leading to improved luminous efficiency and extended operating lifetime in organic electroluminescent elements, suitable for large-sized displays and illuminators.
Implementation Method 1
Iridium complex compounds that utilize phosphorescence emission have been used as light-emitting materials that have high luminous efficiency and can extend operating lifetime.
Data Source
Figure 1
AI summary
An iridium complex compound denoted by a formula (1) below. An iridium complex compound which have high solvent solubility and can further improve the luminous efficiency and driving life of the device is provided. [In the formula (1), Ir represents an iridium atom. n is 1 or 2. Ar is a structure represented by a formula (2) below. In the formula (2), a dashed line represents a bond of Ar in the formula (1). m is an integer from m=n+1 to n+5. The substituents R and R1 in the formulas (1) and (2) are preferable a hydrogen atom or D.]