Hexadentate Ir/Os Complexes for Saturated OLED Emission
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Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated colors, particularly in red, green, and blue emissions, which are essential for full-color displays, and there is a need for materials that can efficiently emit light with tunable wavelengths.
Innovation Solution
The development of a compound of Formula I, where M is a metal such as Ir or Os, with specific aromatic rings and substituents, is used in an organic electroluminescent device to create an OLED with improved emission properties, including the ability to emit saturated colors by optimizing the hexadentate ligand structure and substituents for enhanced photoactive performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional OLED materials are used, then device fabrication is simpler, but color saturation is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the emissive material by incorporating specific metal complexes (Ir or Os) with tailored ligand structures. The hexadentate ligand system with specific aromatic rings and substituents modifies the electronic structure and HOMO-LUMO gap, enabling saturated color emission while maintaining manageable device fabrication processes.
Solution Approach 2:
The invention uses composite material structures where metal centers (Ir/Os) are coordinated with complex organic ligands containing multiple aromatic rings and functional groups. This composite approach combines the photoactive metal center with tailored organic frameworks to achieve both color saturation and reasonable device complexity.
2Illumination intensity
If emission wavelength is tuned for saturated colors, then color performance improves, but material design complexity increases
Solution Approach 1:
The patent applies local quality by introducing specific functional groups and substituents at particular positions within the ligand structure. The hexadentate ligand contains specific aromatic rings (rings A-F) with defined substituent patterns that locally modify electron density and HOMO-LUMO gaps, enabling precise wavelength control without requiring complete redesign of the entire molecular structure.
Solution Approach 2:
The invention systematically adjusts emission wavelength by changing ligand parameters such as aromatic ring types, substituent kinds and positions, and linker structures. These parameter modifications allow tuning of the HOMO-LUMO gap to achieve desired emission colors while maintaining a consistent hexadentate ligand framework.
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 enables the production of OLEDs with improved efficiency and color saturation, allowing for the creation of high-performance, cost-effective organic light-emitting devices suitable for various applications, including flexible and transparent displays.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
One application for phosphorescent emissive molecules is a full color display
Data Source
AI summary
A compound of Formula Iwherein M is a metal selected from Ir or Os;rings A, B, C, D, E, and F are independently a 5-membered or 6-membered aromatic ring; Z1 to Z14 are independently selected from C or N; X is selected from a direct bond, or a linker with one to ten backbone member atoms; and Y is selected from a direct bond, a linker with one to ten backbone member atoms, or is absent to provide an open hexadentate ligand. An organic electroluminescent device (OLED) that includes an anode, a cathode, and an organic layer comprising a compound of the Formula I, and a consumer product comprising the OLED.