Organometallic Phosphorescent Compound for Stable Red OLED Emission

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Solution Overview

Problem

Existing organic electroluminescence devices (OLEDs) face challenges in luminous efficiency, driving voltage, and lifetime, particularly with phosphorescent materials that require improvements in thermal stability, color saturation, and electrochemical stability.

Innovation Solution

A novel organometallic compound with a specific structural formula is developed, featuring low sublimation temperature, high electrochemical stability, and high color saturation, which can be used as a phosphorescent material in OLEDs to enhance luminous efficiency and extend device lifetime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If phosphorescent material is used to improve luminous efficiency by utilizing triplet states, then luminous efficiency is improved, but thermal stability and device lifetime need to be improved

Engineering Contradiction:

Improveluminous efficiencyVSAvoidthermal stability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent modifies the molecular structure of phosphorescent materials by changing ligand types and metal centers, adjusting key parameters such as HOMO-LUMO energy gaps, spin-orbit coupling constants, and steric hindrance parameters to achieve both high luminous efficiency and thermal stability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite phosphorescent materials combining organic ligands with heavy metal centers (Ir, Pt, Os) to create materials that exhibit both efficient triplet state utilization for high luminous efficiency and enhanced thermal stability through strong metal-ligand bonding

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If phosphorescent material is used to improve luminous efficiency, then luminous efficiency is improved, but color saturation needs to be improved

Engineering Contradiction:

Improveluminous efficiencyVSAvoidcolor saturation

Core Design Contradiction:

Use of energy by moving objectVSIllumination intensity

Solution Approach 1:

The patent introduces localized functional groups and substituents at specific positions in the ligand structure to independently optimize different properties: electron-withdrawing groups enhance triplet state utilization for luminous efficiency, while aromatic substituents improve color saturation through extended conjugation

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent designs ligands with flexible coordination modes that allow dynamic adjustment of the metal-ligand bond geometry, enabling optimization of both photophysical properties for luminous efficiency and electronic structure for color saturation

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If conventional phosphorescent material is used, then device can operate, but electrochemical stability needs to be improved

Engineering Contradiction:

Improvedevice operationVSAvoidelectrochemical stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent incorporates electrochemically stable ligand structures with high HOMO energy levels and strong metal-ligand bonding from the design stage, providing a protective effect against electrochemical degradation before it occurs, thereby ensuring both operational functionality and long-term stability

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Illumination intensity

If material with high color saturation is pursued, then color quality is improved, but device lifetime needs to be improved

Engineering Contradiction:

Improvecolor saturationVSAvoiddevice lifetime

Core Design Contradiction:

Illumination intensityVSDuration of action of stationary object

Solution Approach 1:

The patent introduces bulky substituent groups as intermediary protective elements that physically shield the chromophore core from degradation while maintaining color saturation, and provide steric protection that enhances device lifetime by preventing aggregation and oxidative degradation

Inventive Principle:

Principle #24Intermediary (Mediator)

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 improves luminous efficiency and reduces energy consumption while offering superior stability and longer device lifetime, making it suitable for OLED applications.

Implementation Method 1

Due to a spin orbit coupling effect caused by heavy atom effects, besides the use of 25% singlet states, the phosphorescent material can also use energy of excitons of 75% triplet states, so that the luminous efficiency can be improved

Methodology Applied

Scientific EffectSpin orbit coupling effect:

Implementation Method 2

The compound improves luminous efficiency and reduces energy consumption while offering superior stability and longer device lifetime... low sublimation temperature

Methodology Applied

Scientific EffectSublimation: Sublimation

Data Source

PatentUS12477942B2Organic metal compound and application thereof

Publication Date: 2025.11.18 GUANGDONG AGLAIA OPTOELECTRONICS MATERIALS

AI summary

The present invention relates to an organic metal compound and application thereof. The organometallic compound has a structure as shown in Formula I. The compound provided by the present invention has the advantages of low sublimation temperature, high light and electricity stability, high luminous efficiency, long lifetime, high color saturation and the like, can be used in an organic light-emitting device, and particularly has a possibility of being applied to an AMOLED industry as a red luminescent phosphorescent material.