Ligand-Metal OLED Materials for Efficient, Stable Emission
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Solution Overview
Problem
Existing opto-electronic devices using organic materials face challenges in achieving high-performance, cost-effective, and flexible solutions for applications such as displays and illumination.
Innovation Solution
The development of organic electroluminescent materials and devices, specifically compounds with a first ligand LA comprising a structure of Formula I, which can be coordinated to a metal M to form a ligand-metal complex. These complexes are integrated into organic layers of OLEDs, enhancing their performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic materials are used in OLEDs, then cost-effectiveness is improved, but device performance (efficiency, brightness, stability) deteriorates
Solution Approach 1:
The patent modifies the chemical structure of organic ligands by introducing specific functional groups and molecular arrangements (Formulas I-IV) to change the electronic and optical parameters of the materials, thereby improving device performance while maintaining cost-effectiveness of organic materials
Solution Approach 2:
The patent creates composite ligand-metal complexes combining organic ligands with metal centers (Ir, Pt, Os, Rh, Ru, Cu, Ag, Au) to achieve enhanced performance characteristics that neither component alone could provide, resolving the contradiction between material simplicity and performance
2Adaptability or versatility
If organic materials are used for flexibility, then adaptability is improved, but device performance deteriorates
Solution Approach 1:
The patent designs organic ligand structures with specific molecular geometries and flexibility parameters that allow the material to maintain both mechanical flexibility and optimal electronic properties for high-performance opto-electronic devices
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 use of these compounds in OLEDs leads to improved efficiency, brightness, and stability of the devices, making them suitable for various consumer products, including full color displays and lighting applications.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Provided are organometallic compounds comprising one central metal atom and at least one at least bidentate ligand comprising at least two moieties which are independently a monocyclic ring or a polycyclic fused ring system, wherein the monocyclic ring or each ring of the polycyclic fused ring system is independently a 5-membered to 10-membered carbocyclic or heterocyclic ring. Also provided are formulations comprising these organometallic compounds. Further provided are organic light emitting devices (OLEDs) and related consumer products that utilize these organometallic compounds.