Fused-Ring Organometallic OLED Emitters for Filter-Free RGB
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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, with conventional methods relying on absorption filters for white light emission being inefficient and limited in color accuracy.
Innovation Solution
Development of a compound with a specific ligand structure coordinated to a metal, which can be used in an OLED layer to enhance the emission of specific colors, such as red, green, and blue, by directly emitting these colors without the need for additional filtering, utilizing a formulation that includes a tridentate, tetradentate, or hexadentate ligand configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional white OLED with absorption filters is used, then device structure is simpler, but color accuracy and saturation are insufficient
Solution Approach 1:
The patent extracts and removes the absorption filter components from the conventional white OLED structure. Instead of using filters to achieve colors, the invention directly incorporates emissive materials that emit saturated red, green, and blue colors inherently, eliminating the need for filtering components and thereby improving color accuracy while simplifying device structure.
Solution Approach 2:
The patent changes the emission parameters of the OLED by using specific organic electroluminescent materials with tailored molecular structures that emit at specific wavelengths. By modifying the chemical composition and molecular architecture of the emissive layer, the device achieves saturated color emission directly, improving color accuracy without requiring additional filtering layers.
2Ease of manufacture
If absorption filters are used for color emission, then device fabrication is easier, but energy efficiency deteriorates due to light absorption and filtering losses
Solution Approach 1:
The patent removes the energy-losing absorption filter components from the device architecture. By directly emitting saturated colors through specially designed electroluminescent materials, the system eliminates the energy losses associated with absorbing and re-filtering light, thereby improving energy efficiency while maintaining ease of manufacture through direct emission processes.
Solution Approach 2:
The patent converts the inherent property of organic materials to emit specific wavelengths into a benefit. Instead of using filters that waste energy by absorbing light, the invention designs emissive materials whose molecular structures naturally emit at the desired saturated colors, turning what would be a limitation into an energy-efficient advantage.
3Adaptability or versatility
If white light emission with filtering is used, then fewer emissive materials are needed, but color saturation is reduced
Solution Approach 1:
The patent segments the white light emission approach into separate saturated color emission channels. Instead of using a single white emissive material with filters, the invention employs distinct electroluminescent materials for red, green, and blue emissions, each optimized for maximum saturation in its respective color range, thereby achieving superior color saturation while maintaining versatile emission capability.
Solution Approach 2:
The patent applies local quality by using different emissive materials with specific molecular structures optimized for particular color ranges in different regions of the device. Each emissive material is tailored to emit saturated light at specific wavelengths, ensuring high color saturation locally in each color channel while maintaining overall device versatility.
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 improved color accuracy and efficiency in OLEDs by directly emitting saturated colors, reducing the need for additional filtering and enhancing the performance of OLEDs in display 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 a central metal atom and an at least two dentate ligand comprising at least three 6-membered aromatic rings which are fused together. Also provided are formulations comprising these organometallic compounds. Further provided are organic light emitting devices (OLEDs) as well as related consumer products that utilize these organometallic compounds.