Arylene Metal Complex Emitters for OLED Light Outcoupling
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Solution Overview
Problem
Existing triplet emitters in phosphorescent organic electroluminescent devices (OLEDs) lack oriented emission and exhibit suboptimal efficiency, operating voltage, and lifetime performance.
Innovation Solution
Development of iridium and platinum complexes with arylene and heteroarylene groups and aliphatic bi- and oligocyclic groups to enhance oriented emission and improve efficiency, operating voltage, and lifetime in organic electroluminescent devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional triplet emitters (ortho-metallated iridium or platinum complexes with aromatic ligands) are used in phosphorescent OLEDs, then the devices can operate with established materials and synthesis methods, but the quantum efficiency is limited and light outcoupling is suboptimal
Solution Approach 1:
The patent modifies the ligand structure parameters by introducing specific arylene and heteroarylene groups with defined substitution patterns (R radicals at positions 2, 6, or 7), changing the electronic and steric properties of the complex to achieve improved quantum efficiency and light outcoupling while maintaining manufacturability through established coordination chemistry
2Ease of operation
If conventional triplet emitters are used in phosphorescent OLEDs, then the device structure and operation are simple and established, but the lifetime and operating voltage performance are suboptimal
Solution Approach 1:
The patent optimizes the ligand parameters (Ar groups with specific R radical substitutions) to change the photophysical properties of the emitter, resulting in improved device lifetime and operating voltage characteristics while maintaining the simplicity of device operation and structure
3Loss of energy
If conventional triplet emitters are used in phosphorescent OLEDs, then the light outcoupling is limited by standard optical pathways, but the quantum efficiency cannot be improved beyond conventional limits
Solution Approach 1:
The patent changes the molecular parameters of the emitter (introducing specific Ar groups with R radicals at positions 2, 6, or 7) to modify the emission characteristics and improve light outcoupling efficiency, thereby increasing quantum efficiency by reducing energy loss
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 new complexes achieve higher quantum efficiency through improved light outcoupling, allowing for lower current operation and increased device lifetime.
Implementation Method 1
triplet emitters used in phosphorescent organic electroluminescent devices (OLEDs)
Implementation Method 2
organic electroluminescent devices
Data Source
AI summary
The present invention relates to metal complexes which are substituted by aromatic and icylic aliphatic substituents and are suitable for use as emitters in organic electroluminescent devices. The electronic devices of the invention, especially organic electroluminescent devices, are notable for advantages that are not accompanied by a deterioration in the further electronic properties. The invention provides a compound of the following formula (1):wherein B is a group of the following formula (2):