Metal-Ligand OLED Emitters for Saturated Color and Efficiency
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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
Development of a compound comprising a ligand LA of Formula I, which includes a monocyclic or polycyclic ring structure coordinated to a metal M, with specific substituents and configurations, used in an OLED to enhance color emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional methods are used to produce saturated red, green, and blue colors in OLEDs, then color saturation can be achieved, but the efficiency is poor and the device structure becomes complex
Solution Approach 1:
The patent develops novel organic electroluminescent compounds with specific molecular structures and compositions that directly emit saturated red, green, and blue colors. By changing the chemical parameters and molecular design of the emissive materials, the patent achieves both high color saturation and high emission efficiency simultaneously, eliminating the need for inefficient conventional filtering methods
Solution Approach 2:
The patent employs composite organic electroluminescent materials comprising specific compounds and formulations that combine multiple functional properties. These composite materials integrate color emission and high efficiency into a single emissive layer, avoiding the complex stack structures required by conventional approaches while maintaining saturated color output
2Illumination intensity
If conventional methods are used to produce saturated red, green, and blue colors in OLEDs, then color saturation can be achieved, but the device structure becomes complex
Solution Approach 1:
The patent merges the functions of color filtering and light emission into a single emissive layer by using organic electroluminescent compounds that directly emit saturated red, green, and blue colors. This consolidation eliminates the need for separate filtering layers and complex stack structures, achieving both color saturation and structural simplification
Solution Approach 2:
The patent develops universal organic electroluminescent compound formulations that can produce saturated red, green, and blue emissions depending on the specific compound used. This multi-functionality allows a single emissive layer design to achieve all three primary colors with high saturation, eliminating the need for separate color generation mechanisms and reducing overall device complexity
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 produce saturated colors, improving display performance and efficiency.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Disclosed is a compound including a ligand LA of Formula I,In Formula I, moiety B is a monocyclic or polycyclic ring structure comprising 5- and/or 6-membered rings; Y is selected from O, S, NR, and CRR′; Z is carbon or nitrogen; each R, R′, RA, and RB is independently hydrogen or a substituent; LA is coordinated to a metal M; and any two adjacent R, R′, RA, and RB can be joined or fused together to form a ring. Formulations, organic light emitting diodes, and consumer products including the compound are also disclosed.