OLED Phosphorescent Emitter Complexes for Saturated RGB Color
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Solution Overview
Problem
Existing organic light-emitting diodes (OLEDs) face challenges in achieving saturated red, green, and blue colors for full-color displays, and conventional methods for producing these colors are inefficient or costly.
Innovation Solution
A metal coordination complex with a specific structure, comprising a metal M bonded to aromatic or heteroaromatic rings, is used in the organic layer of OLEDs to enhance color emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional absorption filters are used to produce saturated colors from white backlight, then color saturation can be achieved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the color generation function from the optical filtering approach and implements it directly at the emission source through phosphorescent emitters. Each emitter molecule is designed with specific ligands that determine the emitted color, eliminating the need for separate absorption filters and simplifying the device structure while maintaining color saturation.
Solution Approach 2:
The patent introduces phosphorescent emitter molecules as intermediaries between the electrical input and the light output. These emitters convert electrical energy directly into colored light through phosphorescence, serving as a mediating mechanism that eliminates the need for white backlight and absorption filters, thereby reducing device complexity while achieving saturated colors.
2Illumination intensity
If phosphorescent emitters are used to produce saturated colors, then color purity improves, but material synthesis complexity increases
Solution Approach 1:
The patent achieves different colors by systematically changing the ligand parameters in the phosphorescent emitters. By modifying the ligand structure (e.g., different aromatic hydrocarbons, heterocycles, or their combinations), the emission color can be tuned across the visible spectrum. This parameter-based approach allows for controlled color variation while maintaining a consistent emitter molecular framework, simplifying the overall synthesis process.
Solution Approach 2:
The patent employs a universal emitter molecular structure (Formula I) that can produce multiple colors through ligand variation. The core emitter framework remains constant while only the ligand components need to be changed to achieve different colors, making the synthesis process more standardized and easier to manufacture across different color requirements.
3Ease of operation
If multiple separate emissive layers are used for different colors, then color control is improved, but device structure complexity increases
Solution Approach 1:
The patent merges the color control function into the molecular structure of single-emitter devices. Instead of using multiple separate emissive layers, the color is controlled at the molecular level through ligand selection in the phosphorescent emitter. This consolidation reduces the number of layers and simplifies the device structure while maintaining precise color control capability.
Solution Approach 2:
The patent implements color control through local molecular design rather than global layer structure. Each phosphorescent emitter is locally optimized with specific ligands to produce the desired color, allowing for precise color control within a unified device architecture without requiring multiple separate emissive layers.
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 metal coordination complex improves the color purity and efficiency of OLEDs, enabling the production of saturated red, green, and blue pixels, enhancing display performance.
Implementation Method 1
One application for phosphorescent emissive molecules is a full color display
Implementation Method 2
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Provided are Platinum and Iridium complexes with spiro[4.4]nonane and analogs-including ligands. Also provided are formulations including these Platinum and Iridium complexes with spiro[4.4]nonane and analogs-including ligands. Further provided are OLEDs and related consumer products that utilize these Platinum and Iridium complexes with spiro[4.4]nonane and analogs-including ligands.