Metal-Coordinated Electroluminescent Compounds for Saturated OLED Colors
Find Innovative SolutionsGenerate Solutions
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 white light often require complex stack structures or absorption filters, which can be inefficient.
Innovation Solution
A compound with a first ligand LA comprising a structure of Formula I, where moiety B or C has a structure of Formula II, is coordinated to a metal M, forming a tridentate, tetradentate, or hexadentate ligand, capable of emitting specific colors directly or with color-altering layers to achieve saturated colors without complex stack structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional methods use white OLED with absorption filters to produce saturated colors, then color saturation is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts and eliminates the absorption filter layers from the conventional white OLED structure. By directly incorporating emissive ligands that emit saturated red, green, and blue colors, the invention removes the need for color filtering layers, thereby reducing device complexity while maintaining color saturation.
Solution Approach 2:
The patent changes the emission parameters of the OLED by using specific organic ligands with tailored photophysical properties. By selecting ligands that directly emit saturated colors (Formula I for red, Formula II for green, Formula III for blue), the invention achieves color saturation without requiring absorption filters, thus simplifying the device structure.
2Manufacturing precision
If conventional methods use multiple emissive layers or stack structures to achieve full color, then color accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the color emission function into three distinct ligand types (Formula I, II, and III) that can be used in separate pixels or sub-pixels. Each ligand type is responsible for emitting one primary color (red, green, or blue), enabling full-color display capability through a simplified approach that avoids complex multi-layer stacking.
Solution Approach 2:
The patent creates a universal platform using metal coordination compounds with organic ligands that can be tuned to emit different colors. The same basic compound structure (Formula I-III) serves multiple functions by simply changing the ligand type, eliminating the need for different device architectures for different colors and simplifying manufacturing.
3Device complexity
If conventional OLEDs use white emission with color filters, then device structure is simplified, but color saturation and efficiency are reduced
Solution Approach 1:
The patent changes the fundamental emission parameter from white light to directly emitted saturated colors by selecting specific organic ligands (Formula I, II, or III) with appropriate HOMO-LUMO energy gaps. This parameter change enables the device to maintain structural simplicity while achieving high color saturation and emission efficiency simultaneously.
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 production of saturated red, green, and blue colors in OLEDs, simplifying the manufacturing process and improving color accuracy without the need for additional filters or complex layering.
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 is provided that has a first ligand LA comprising a structure of Formula I,where at least one of a moiety B or moiety C has a structure of Formula II,fused thereto. In Formulas I and II, each of moiety B to moiety D is a monocyclic ring or a polycyclic fused ring system; m is 0, 1, 2, or 3; Z is C or N; K is a direct bond or a linking group; n is 1, 2, or 3; each of Rα, Rβ, RA, RB, RC, RD, and RE is hydrogen or a General Substituent defined herein; and LA is coordinated to a metal M by the dashed lines in Formula I. Formulations, OLEDs, and consumer products containing the compound are also provided.