Organometallic Complex for High Purity OLED Emission

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Solution Overview

Problem

Existing phosphorescent materials for organic light-emitting diodes (OLEDs) suffer from broad luminescence spectra and poor color purity, limiting their performance in high-end displays, and require improved stability.

Innovation Solution

Development of a novel organometallic complex with a specific formula incorporating heteroaromatic and aromatic groups, transition metal elements, and bidentate ligands, which enhances luminescence efficiency, color purity, and adjusts light-emitting wavelengths by introducing fused ring units containing different main group elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If phosphorescent materials are used to improve internal quantum efficiency, then internal quantum efficiency is improved (close to 100%), but luminescence spectrum becomes too broad and color purity deteriorates

Engineering Contradiction:

Improveinternal quantum efficiencyVSAvoidcolor purity

Core Design Contradiction:

Use of energy by moving objectVSManufacturing precision

Solution Approach 1:

The patent changes the chemical and structural parameters of the phosphorescent material by incorporating main group element compounds (Be, Mg, Ca, Sr, Ba) into the OLED device structure. This parameter change modifies the luminescence characteristics to achieve narrower emission spectra and improved color purity while maintaining high internal quantum efficiency through phosphorescent mechanisms

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite system by combining phosphorescent materials with main group element compounds (beryllium, magnesium, calcium, strontium, or barium compounds) in the OLED device. This composite approach allows the phosphorescent material to provide high internal quantum efficiency while the main group element compound contributes to narrowing the luminescence spectrum and improving color purity

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If conventional phosphorescent materials are used, then internal quantum efficiency is improved, but device stability deteriorates

Engineering Contradiction:

Improveinternal quantum efficiencyVSAvoiddevice stability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent develops a composite system combining phosphorescent materials with main group element compounds. The main group element compounds (Be, Mg, Ca, Sr, Ba) form stable complexes or layers that enhance the overall device stability and reliability while the phosphorescent component maintains high internal quantum efficiency through spin-orbit coupling effects

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The main group element compounds act as intermediary materials between the phosphorescent emitter and the surrounding OLED components. These intermediaries facilitate energy transfer, protect the phosphorescent material from degradation, and improve the overall stability of the device while preserving the high efficiency phosphorescent emission

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 organometallic complex increases luminescence efficiency, improves color purity, and adjusts light-emitting wavelengths, addressing the limitations of existing phosphorescent materials and enhancing the performance of organic electronic devices.

Implementation Method 1

The introduction of heavy metals improves the molecular spin orbit coupling, shortens the phosphorescence lifetime and enhances the intersystem crossing of molecules, so that phosphorescence can be successfully emitted

Methodology Applied

Scientific EffectSpin orbit coupling:

Implementation Method 2

The organic light-emitting diodes based on fluorescent materials have high reliability, but their internal electroluminescence quantum efficiency is limited to 25% under electric field excitation... The introduction of heavy metals improves the molecular spin orbit coupling, shortens the phosphorescence lifetime and enhances the intersystem crossing of molecules, so that phosphorescence can be successfully emitted

Methodology Applied

Scientific EffectPhosphorescence: Phosphorescence

Data Source

PatentUS11594690B2Organometallic complex, and polymer, mixture and formulation comprising same, and use thereof in electronic device

Publication Date: 2023.02.28 GUANGZHOU CHINARAY OPTOELECTRONICS MATERIALS LTD

AI summary

The present invention relates to an organometallic complex as shown in general formula (I), and to a polymer, mixture and formulation comprising same, and to use thereof in an electronic device, in particular the use in an organic luminous diode. By providing a new high performance phosphorescent luminous material, in the present the device structure is optimized such that the device achieves the best performance, realizing a high efficiency, high luminance and high stability OLED device, thereby providing a better material option for full-color display and lighting.