Iridium OLED Emitters With Bulky Alkyl Substitution for Longer Lifetime

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing OLEDs face challenges in achieving high external quantum efficiency (EQE) and prolonged lifetime, particularly in applications requiring saturated colors and flexible substrates.

Innovation Solution

The use of cyclometalated iridium complexes with triphenylene or aza triphenylene and bulky alkyl substitution in the emissive layer of OLEDs to enhance alignment and stability, thereby improving EQE and operational lifetime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional OLED materials are used, then device fabrication is simpler, but external quantum efficiency and operational lifetime are insufficient

Engineering Contradiction:

Improveoperational lifetimeVSAvoidmolecular structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent modifies the molecular parameters of OLED emitter compounds by incorporating triphenylene or aza triphenylene cores with bulky alkyl substituents, changing the structural parameters to achieve both improved operational lifetime and maintained manufacturability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates composite molecular structures combining iridium centers with cyclometalated ligands featuring triphenylene or aza triphenylene frameworks, resulting in phosphorescent emitters that simultaneously achieve high efficiency and prolonged device lifetime

Inventive Principle:

Principle #40Composite materials

2Productivity

If cyclometalated iridium complexes with triphenylene or aza triphenylene and bulky alkyl substitution are used, then external quantum efficiency and operational lifetime are improved, but molecular structure complexity increases

Engineering Contradiction:

Improveexternal quantum efficiencyVSAvoidmolecular structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality by introducing bulky alkyl substituents at specific positions on the triphenylene or aza triphenylene framework, creating localized structural features that enhance photophysical properties and device performance without requiring complete molecular redesign

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent systematically varies parameters such as the type of alkyl substituent, its position on the core framework, and the number of substituents to optimize external quantum efficiency while managing molecular complexity

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If advanced emissive materials are used, then operational lifetime is extended, but manufacturing process complexity increases

Engineering Contradiction:

Improveoperational lifetimeVSAvoidfabrication complexity

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The patent develops emissive materials that can be deposited using conventional OLED fabrication techniques, avoiding the need for complex specialized manufacturing processes while achieving extended operational lifetime through improved material stability

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 proposed compounds and structures lead to improved external quantum efficiency and extended operational lifetime of OLEDs, making them suitable for consumer products and flexible displays.

Implementation Method 1

One application for phosphorescent emissive molecules is a full color display

Methodology Applied

Scientific EffectPhosphorescence: Phosphorescence

Data Source

PatentUS12522625B2Organic electroluminescent materials and devices

Publication Date: 2026.01.13 UNIVERSAL DISPLAY CORP

AI summary

Cyclometalated iridium complexes having triphenylene or aza triphenylene and bulky alkyl substitution that can be used as emitters in OLEDs to improve the external quantum efficiency (EQE) and lifetime of OLEDs are disclosed.