Metal-Coordinated OLED Ligand Compounds for Saturated Color Emission
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face challenges in achieving saturated red, green, and blue pixel emissions required for full color displays, and conventional methods for producing white light often require complex stack structures or absorption filters.
Innovation Solution
A compound with a first ligand LA comprising a structure of Formula I, coordinated to a metal M, is used in the organic layer of OLEDs, allowing for direct emission of saturated colors or white light without the need for complex stack structures or filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional methods are used to produce white light in OLEDs, then white light emission is achieved, but complex stack structures or absorption filters are required
Solution Approach 1:
The patent extracts and eliminates the need for complex stack structures and absorption filters by using a single emissive layer with specific organic compounds that can directly emit white light or saturated colors, thereby simplifying the overall device structure while maintaining the desired light emission properties
Solution Approach 2:
The patent employs parameter changes by selecting specific organic compounds with tailored photophysical properties (such as host-guest systems, thermally activated delayed fluorescence compounds, or phosphorescent compounds) that enable direct emission of white light or saturated colors through controlled energy transfer and emission mechanisms, eliminating the need for additional filtering layers
2Manufacturing precision
If saturated red, green, and blue pixel emissions are required for full color displays, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by developing a single emissive layer system that can produce multiple saturated colors (red, green, and blue) through appropriate selection of organic compounds and energy transfer mechanisms, allowing one layer to perform the function that traditionally required separate pixel structures for each color
Solution Approach 2:
The patent utilizes color changes by employing organic compounds with specific photophysical properties that enable direct emission of saturated colors through controlled energy transfer, host-guest interactions, or thermally activated delayed fluorescence mechanisms, achieving color accuracy without requiring complex multi-layer stack structures for each pixel
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 efficient and direct emission of saturated colors or white light in OLEDs, simplifying the manufacturing process and improving color accuracy in displays.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
A compound having a first ligand LA comprising a structure of Formula I,is provided. In Formula I, moiety C is a monocyclic ring or a polycyclic fused ring system; ring D is a carbocyclic or heterocyclic ring; each of X1 and X2 is C or N; K is a direct bond or a linking group; R1 and R2 are H, D, or T; each Rα, Rβ, RA, RC, and RD is hydrogen or a General Substituent defined herein; and LA is coordinated to a metal M. Formulations, OLEDs, and consumer products comprising the compound are also provided.