Metal-Coordinated Electroluminescent Materials for Saturated Colors
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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 first ligand LA comprising a structure of Formula I, coordinated to a metal M, which can be used in an OLED's organic layer to enhance color specificity and efficiency, potentially replacing the need for absorption filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional white OLEDs use absorption filters to produce saturated colors, then color display capability is achieved, but light efficiency is reduced and device complexity increases
Solution Approach 1:
Instead of using white light emission with absorption filters to achieve saturated colors, the patent inverts the approach by using direct saturated color emission from the OLED materials themselves. This eliminates the need for color filters and reduces energy loss, as the emission is generated directly in the desired color rather than filtering out unwanted wavelengths.
Solution Approach 2:
The patent extracts and removes the absorption filter components from the conventional OLED structure. By developing organic materials that emit saturated colors directly, the unnecessary filtering layers are eliminated, simplifying the device structure and improving overall light efficiency while maintaining color saturation.
2Adaptability or versatility
If absorption filters are used for color conversion in OLEDs, then full color display is achieved, but device complexity increases
Solution Approach 1:
The patent develops organic materials that can emit multiple saturated colors (red, green, blue) directly, making the OLED material itself multi-functional for color display. This eliminates the need for separate color filter layers and complex color conversion structures, as the emission materials provide all necessary color capabilities intrinsically.
Solution Approach 2:
Rather than adding complex filtering layers to a white OLED to achieve color display, the patent inverts the approach by using directly emitting colored materials. This simplifies the device structure by removing unnecessary filter components while maintaining full color display capability through the inherent properties of the organic emission materials.
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 enhances the ability of OLEDs to emit saturated colors directly, improving color accuracy and reducing the complexity of color conversion processes.
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, where at least one of RA and RB is R#, wherein R# with a structure of Formula II,In Formula I, wherein each of moiety A and B is a monocyclic ring or polycyclic system; each of Z1 to Z4 is C or N; each of K1 and K2 is a direct bond or a linking group; L is a direct bond or a linking group; L# is a direct bond or an organic linker; each substituent is hydrogen or a General Substituent defined herein; two of R1 to R5 are joined to form a ring C1, and another two of R1 to R5 are joined to form a ring C2; and LA is coordinated to a metal M. Formulations, OLEDs, and consumer products containing the compound are also provided.