Iridium OLED Emitters for Saturated Color in Simpler White OLEDs

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Solution Overview

Problem

Existing organic light-emitting diodes (OLEDs) face challenges in achieving saturated red, green, and blue colors for full color displays, and conventional methods for producing white light often require complex stack structures or absorption filters, which can be inefficient.

Innovation Solution

The development of a compound with the formula Ir(LA)(LB)(LC), where LA, LB, and LC are specific ligands, each comprising monocyclic or polycyclic structures with defined substituents, which can be used in an OLED to enhance color emission and simplify the device structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If conventional methods are used to produce saturated red, green, and blue colors for full color displays, then color saturation is achieved, but device complexity increases due to requiring complex stack structures or absorption filters

Engineering Contradiction:

Improvecolor saturationVSAvoiddevice structure

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent combines multiple color emission capabilities into a single emissive layer by using a host-guest molecular complex where the host material and guest dopant work together to emit saturated red, green, and blue colors simultaneously, eliminating the need for separate emissive layers or absorption filters

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The host material in the molecular complex serves multiple functions: it acts as the emission center, facilitates energy transfer to the guest dopant, and enables saturated color emission across the visible spectrum, replacing what would traditionally require multiple specialized components

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Illumination intensity

If conventional methods are used to produce white light in OLEDs, then white light emission is achieved, but manufacturing complexity increases

Engineering Contradiction:

Improvewhite light emissionVSAvoidmanufacturing complexity

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent merges white light emission functionality into a single emissive layer by combining host and guest materials that together produce saturated red, green, and blue emissions that blend to form white light, simplifying the manufacturing process compared to conventional multi-layer approaches

Inventive Principle:

Principle #5Merging (Combining)

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 improved color saturation and simplifies the OLED structure, potentially reducing manufacturing complexity and enhancing performance in organic light-emitting devices.

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

PatentUS12534485B2Organic electroluminescent materials and devices

Publication Date: 2026.01.27 UNIVERSAL DISPLAY CORP

AI summary

Provided are organometallic compounds having a formula Ir(LA)(LB)(LC), wherein:ligand LA is ligand LB is andligand LC isAlso provided are formulations including these organometallic compounds. Further provided are OLEDs and related consumer products that utilize these organometallic compounds.