Organic Electroluminescent Device with Multidentate Metal Complex Polymer
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Solution Overview
Problem
Existing organic electroluminescent devices face challenges in achieving high luminance efficiency and durability while being susceptible to performance variations due to manufacturing conditions, particularly when using phosphorescent polymer materials.
Innovation Solution
The development of an organic electroluminescent device incorporating a polymer with a metal complex containing a tri- or higher-dentate ligand, which includes specific metal ions like iridium and platinum, and nitrogen-containing heterocycles, enhancing emission efficiency and driving durability while minimizing performance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phosphorescent polymer materials are used to achieve high luminescence efficiency and large area, then luminescence efficiency is improved, but driving durability is insufficient
Solution Approach 1:
The patent changes the coordination number parameter of the metal complex from traditional 4-coordinate to 5-coordinate or 6-coordinate structures. This parameter change in the molecular structure leads to both improved luminescence efficiency and enhanced driving durability, resolving the contradiction between these two properties.
Solution Approach 2:
The patent uses composite polymer materials incorporating metal complexes with specific coordination structures (5-coordinate or 6-coordinate). The composite structure combines the advantages of polymer materials (processability, large area) with the improved stability and efficiency of specifically structured metal complexes, achieving both high luminescence efficiency and good driving durability.
2Ease of manufacture
If polymers are used by dissolving in solvent for manufacturing, then ease of manufacture is improved, but performance variation occurs due to storage condition changes
Solution Approach 1:
The patent changes the physical state parameter of the polymer material from solution form to solid powder form. This parameter change eliminates the problems associated with solvent storage and handling, allowing the material to be stored and transported as a stable powder while maintaining ease of manufacture through simple dissolution and processing.
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 solution provides organic electroluminescent devices with superior emission characteristics and improved driving durability at low driving voltage, maintaining performance consistency across varying manufacturing conditions.
Implementation Method 1
organic electroluminescent device which can emit light by the conversion of electric energy to light
Implementation Method 2
phosphorescent polymer materials are necessary
Data Source
AI summary
The invention provides an organic electroluminescent device having at least an organic compound layer provided between a pair of electrodes. The organic electroluminescent device has at least a polymer comprising a metal complex containing a tri- or higher-dentate ligand in the polymer molecule. The metal complex preferably contains a tetra- or higher-dentate ligand in the polymer molecule. At least one of the ligands is preferably a chain. The metal complex preferably contains a transition metal ion or a rare earth metal ion. The metal complex preferably contains a nitrogen atom in its complex structure. Further, the polymer preferably contains the metal complex in its main chain or its side chain.