Organometallic Ligand Compounds for Saturated OLED Emission

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Solution Overview

Problem

Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated colors, particularly in red, green, and blue emissions, which are essential for full-color displays, and often rely on complex layer structures and materials that are costly and less flexible.

Innovation Solution

A novel compound comprising a ligand of Formula I, complexed with metals like Ru, Os, Ir, Pd, Pt, Cu, Ag, or Au, is introduced, which can be used in OLEDs to enhance color emission by forming tridentate, tetradentate, pentadentate, or hexadentate ligands, offering improved photoactive properties and flexibility in device design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional materials and complex layer structures are used to achieve saturated colors in OLEDs, then color saturation is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvecolor saturationVSAvoidlayer structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent changes the chemical parameters of the emissive materials by introducing specific ligand structures (Formula I) with varied substituents (RA, RB, RC, RD) that can be tuned to achieve different color emissions. This allows achieving saturated colors through material composition rather than complex layer structures

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops a universal ligand platform (Formula I) that can achieve multiple functions: it can produce saturated red, green, and blue emissions, and can be used in both single-layer and multi-layer OLED structures. The ligand system replaces the need for different complex structures for different color requirements

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If conventional materials are used in OLEDs, then device performance is acceptable, but flexibility and cost-effectiveness are reduced

Engineering Contradiction:

Improvedevice performanceVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent modifies molecular parameters of the organic compounds by introducing deuterium substitution and varied substituents (alkyl, cycloalkyl, heteroalkyl, aryl, etc.) that enhance material stability and performance while maintaining flexibility in device design and application

Inventive Principle:

Principle #35Parameter changes

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 the production of OLEDs with enhanced color accuracy and flexibility, potentially reducing production costs and enabling more efficient, flexible display technologies.

Implementation Method 1

OLEDs make use of thin organic films that emit light when voltage is applied across the device

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

One application for phosphorescent emissive molecules is a full color display

Methodology Applied

Scientific EffectPhosphorescence: Phosphorescence

Data Source

PatentUS11647667B2Organic electroluminescent compounds and organic light emitting devices using the same

Publication Date: 2023.05.09 UNIVERSAL DISPLAY CORP

AI summary

Provided are organometallic compounds. Also provided are formulations comprising these organometallic compounds. Further provided are OLEDs and related consumer products that utilize these organometallic compounds.