Organometallic Emission Layer Composition for Faster Low-Voltage OLEDs

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Solution Overview

Problem

Existing organic light-emitting devices face challenges in enhancing their performance in terms of luminance, driving voltage, and response speed while maintaining wide viewing angles and high contrast ratios.

Innovation Solution

Incorporation of a novel organometallic compound represented by Formula 1, which includes specific metal elements and organic groups, into the interlayer or emission layer of the light-emitting device, along with a thermally activated delayed fluorescence material as a dopant, to improve carrier recombination and emission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional organic light-emitting devices are used, then they provide wide viewing angles and high contrast ratios, but they suffer from insufficient luminance, high driving voltage, and slow response speed

Engineering Contradiction:

ImproveluminanceVSAvoiddriving voltage

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the emission layer by introducing specific organometallic compounds with defined molecular structures (Formula 1) containing metal centers (Ir, Pt, Os, etc.) and organic ligands. This compositional parameter change enables simultaneous improvement in luminance efficiency and reduction in driving voltage requirements

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material strategy by combining organometallic compounds (emissive dopants) with host materials in the emission layer. This composite structure leverages the complementary properties of both components: the organometallic compound provides high quantum efficiency and the host material facilitates charge transport, achieving enhanced luminance at lower driving voltages

Inventive Principle:

Principle #40Composite materials

2Speed

Engineering Contradiction:

Improveresponse speedVSAvoiddriving voltage

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent modifies the molecular structure parameters of the emissive materials by selecting organometallic compounds with specific coordination geometries and ligand types (cyclometal ligands, N^C ligands). These structural parameter changes optimize the radiative decay rates and charge carrier dynamics, enabling faster response speeds while maintaining low operating voltages

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the organometallic compound is incorporated into the emission layer, then carrier recombination efficiency and emission efficiency are improved, but the device structure and material selection become more complex

Engineering Contradiction:

Improvecarrier recombination efficiencyVSAvoidmaterial selection complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent systematically varies molecular parameters of the organometallic compounds (metal center type, ligand substitution patterns, steric hindrance groups) to optimize carrier recombination efficiency. By establishing structure-performance relationships, the patent provides design rules that simplify material selection while achieving high recombination efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality principle by introducing specific functional groups and substituents at particular positions in the molecular structure (e.g., bulky groups at specific locations to prevent aggregation). This localized structural modification optimizes recombination efficiency without requiring complete redesign of the entire molecular structure, thereby managing complexity

Inventive Principle:

Principle #3Local quality

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 compound enhances the luminance, reduces driving voltage, and increases response speed, thereby improving the overall performance of the light-emitting device.

Implementation Method 1

Holes provided from the first electrode move toward the emission layer through the hole transport region, and electrons provided from the second electrode move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons may transition from an excited state to a ground state, thereby generating light.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

Methodology Applied

Scientific EffectThermally activated delayed fluorescence: Phosphorescence

Data Source

PatentUS20260040815A1Organometallic compound, light-emitting device including the same, electronic apparatus, and electronic equipment

Publication Date: 2026.02.05 SAMSUNG DISPLAY CO LTD

AI summary

Embodiments provide an organometallic compound, a light-emitting device including the organometallic compound, an electronic apparatus including the light-emitting device, and electronic equipment including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an emission layer, and the organometallic compound. The organometallic compound is represented by Formula 1, which is explained in the specification: