Formula 1 Organic Electroluminescent Compounds for Longer OLED Lifetime

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Solution Overview

Problem

Existing organic light-emitting diodes (OLEDs) face challenges such as low internal quantum efficiency, particularly in fluorescent OLEDs, non-saturated blue color, short device lifetime, and high operating voltage, which hinder their commercialization and performance.

Innovation Solution

Development of novel compounds with a specific structure of Formula 1, incorporating various substituents and aryl groups, which are used in organic electroluminescent devices to enhance device performance, particularly improving device lifetime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If fluorescent OLED structure is used, then device simplicity is maintained, but internal quantum efficiency is limited to 25%

Engineering Contradiction:

Improvedevice structureVSAvoidinternal quantum efficiency

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The patent changes the emission mechanism parameter from fluorescent to phosphorescent by introducing heavy metal complexes (Ir, Pt, Os) as emitters. This parameter change enables triplet state utilization through spin-orbit coupling, transforming the device from 25% IQE fluorescent OLED to potentially 100% IQE phosphorescent OLED while maintaining the basic bilayer structure simplicity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material strategy by combining organic ligands with heavy metal centers (Ir, Pt, Os complexes) to create phosphorescent emitters. These composite materials exhibit both organic processability and heavy metal-induced phosphorescence, enabling high efficiency while maintaining fabrication simplicity through solution processing

Inventive Principle:

Principle #40Composite materials

2Loss of energy

If phosphorescent emitters are used to achieve high efficiency, then internal quantum efficiency reaches 100%, but device lifetime becomes short

Engineering Contradiction:

Improveinternal quantum efficiencyVSAvoiddevice lifetime

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent applies local quality principle by designing specific ligand environments around the heavy metal center. The ligands are engineered with particular functional groups and molecular structures that create favorable local electronic and steric environments, stabilizing the phosphorescent emitter and reducing degradation pathways while maintaining high phosphorescence quantum yield

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses host-guest complex formation as an intermediary mechanism. The organic host material acts as a mediator that protects the sensitive phosphorescent emitter from direct contact with electrodes and environmental factors, while facilitating charge transfer and exciton management. This intermediary layer significantly extends device lifetime while preserving the phosphorescent emission efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If conventional OLED fabrication methods are used, then manufacturing process is established, but efficiency roll-off occurs at high brightness

Engineering Contradiction:

Improvefabrication processVSAvoidbrightness efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent employs dynamic exciton management through thermally activated delayed fluorescence (TADF) mechanisms. The system dynamically transitions between singlet and triplet states via reverse intersystem crossing, allowing efficient utilization of both singlet and triplet excitons across different operating conditions. This dynamic behavior maintains high external quantum efficiency even at high brightness levels where conventional fluorescent OLEDs suffer from efficiency roll-off

Inventive Principle:

Principle #15Dynamics

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 novel compounds with Formula 1 structure enhance the internal quantum efficiency and extend the device lifetime of OLEDs, addressing the limitations of existing technologies.

Implementation Method 1

Recently, Adachi achieved high efficiency through thermally activated delayed fluorescence (TADF) of organic compounds. These emitters have small singlet-triplet gap that makes the transition from triplet back to singlet possible.

Methodology Applied

Scientific EffectThermally activated delayed fluorescence (TADF):

Implementation Method 2

In the TADF device, the triplet excitons can go through reverse intersystem crossing to generate singlet excitons, resulting in high IQE.

Methodology Applied

Scientific EffectReverse intersystem crossing:

Implementation Method 3

Organic light-emitting diodes (OLEDs)... Once a bias is applied to the device, green light was emitted from the device.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12421247B2Organic electroluminescent material and device thereof

Publication Date: 2025.09.23 BEIJING SUMMER SPROUT TECH CO LTD

AI summary

Provided are an organic electroluminescent material and device. The organic electroluminescent material is a compound having a structure of Formula 1. Those novel compounds are applicable to electroluminescent devices and can provide better device performance, such as an increased device lifetime. Further provided are an organic electroluminescent device containing the compound and a compound composition containing the compound.