Tetradentate Phosphorescent Compound for OLED Efficiency and Durability
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Solution Overview
Problem
Current organic electroluminescence devices face challenges in achieving high luminous quantum efficiency, low driving voltage, and durability using phosphorescent materials.
Innovation Solution
Incorporating a specific compound represented by formula (I) in an organic layer, which includes a divalent metal such as platinum, palladium, nickel, or copper, with a tetradentate ligand structure, to enhance luminous quantum efficiency, reduce driving voltage, and improve durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phosphorescent materials such as iridium complexes or platinum complexes are used to improve luminous quantum efficiency, then the device efficiency is enhanced, but the durability and driving voltage characteristics remain insufficient
Solution Approach 1:
The patent modifies the chemical structure of phosphorescent materials by introducing specific ligand configurations (formula I with divalent metal centers coordinated to organic ligands containing nitrogen atoms). This structural parameter change optimizes both the photophysical properties for high quantum efficiency and the chemical stability for improved durability, resolving the contradiction between efficiency and reliability
Solution Approach 2:
The invention employs composite phosphorescent materials combining divalent metal centers (Pt, Pd, Ni, Cu) with specifically designed organic ligands containing azine and azole rings. This composite approach creates materials that simultaneously achieve high luminous quantum efficiency through phosphorescence while maintaining enhanced durability through stable coordination structures
2Productivity
If conventional phosphorescent materials are used to achieve high efficiency, then luminous quantum efficiency is improved, but driving voltage remains too high
Solution Approach 1:
The patent optimizes the energy level parameters of phosphorescent materials by designing ligands with specific HOMO-LUMO gaps and energy levels. The divalent metal complexes in formula (I) are engineered to have appropriate energy alignment with charge transport materials, reducing energy barriers for charge injection and transport, thereby lowering driving voltage while maintaining high quantum efficiency
3Productivity
If existing phosphorescent materials are used, then some level of efficiency is achieved, but all three parameters (luminous quantum efficiency, driving voltage, and durability) cannot be optimized simultaneously
Solution Approach 1:
The patent segments the phosphorescent material into distinct functional components: a divalent metal center (Pt, Pd, Ni, or Cu) coordinated to organic ligands with specific functional groups (azine and azole rings). This segmentation allows independent optimization of each component's properties while maintaining overall molecular stability, achieving high efficiency without excessive structural complexity
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 compound significantly enhances luminous quantum efficiency, lowers driving voltage, and extends the lifespan of organic electroluminescence devices, addressing the limitations of existing devices.
Implementation Method 1
In recent years, high efficiency of the device is being advanced by using a phosphorescent material. Iridium complexes, platinum complexes and so on are known as the phosphorescent light emitting material
Data Source
AI summary
An organic electroluminescence device, includes: a pair of electrodes; and at least one organic layer including a light emitting layer, the light emitting layer being provided between the pair of electrodes, wherein at least one layer of the at least one organic layer contains a compound represented by formula (I) as defined in the specification.