Blue OLED Emission Layer Using Organometallic Compound

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Solution Overview

Problem

Existing light-emitting devices, particularly organic light-emitting devices, face challenges in achieving optimal performance in terms of luminance, driving voltage, and response speed, especially in producing blue light with high color purity and efficiency.

Innovation Solution

Incorporation of an organometallic compound represented by Formula 1 into the emission layer of a light-emitting device, which can emit blue light with a maximum wavelength between 430 nm to 480 nm, and optionally combined with other compounds to enhance luminescence efficiency and lifespan characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional emission layers are used, then device structure is simple, but luminance and color purity are insufficient

Engineering Contradiction:

ImproveluminanceVSAvoidemission layer composition

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The emission layer employs a composite material system consisting of a host compound and a guest organometallic compound (Formula 1). This composite structure enables the host to provide structural framework and charge transport while the guest compound delivers high-efficiency blue light emission with superior color purity, thereby achieving enhanced luminance without excessive complexity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent introduces specific functional groups (carbazole, pyrimidine, triazine) at strategic positions within the molecular structure of the organometallic compound. These local structural modifications create regions of high electron density and optimized HOMO-LUMO energy levels, enabling precise control over emission wavelength and color purity while maintaining overall device simplicity.

Inventive Principle:

Principle #3Local quality

2Power

If conventional emission layers are used, then manufacturing is easier, but driving voltage and response speed are suboptimal

Engineering Contradiction:

Improvedriving voltageVSAvoidemission layer fabrication

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The patent systematically adjusts key parameters including the molecular weight of the host and guest compounds, the ratio of host to guest material in the emission layer, and the molecular structure of the organometallic compound. These parameter optimizations enable fine-tuning of charge carrier concentrations and recombination dynamics, achieving optimal driving voltage and response speed while maintaining manufacturability through standard vacuum deposition processes.

Inventive Principle:

Principle #35Parameter changes

3Speed

If conventional emission layers are used, then device structure is simpler, but response speed and luminance efficiency are reduced

Engineering Contradiction:

Improveresponse speedVSAvoidemission layer composition

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent replaces conventional fluorescent emission mechanisms with phosphorescent emission using organometallic compounds containing heavy metals (iridium, platinum, palladium). This substitution exploits spin-orbit coupling effects to enable triplet state utilization, dramatically improving response speed by eliminating the 90° rule limitation of fluorescent materials while maintaining relatively simple device structure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Manufacturing precision

If conventional emission layers are used, then manufacturing is easier, but color purity and luminescence efficiency are insufficient

Engineering Contradiction:

Improvecolor purityVSAvoidemission layer fabrication

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

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 improves the luminance, driving voltage, and response speed of the light-emitting device, particularly in emitting blue light with high color purity and efficiency, enhancing overall device performance.

Implementation Method 1

Holes provided by the first electrode move toward the emission layer through the hole transport region, while electrons provided by the second electrode move toward the emission layer through the electron transport region. These carriers, namely the holes and electrons, recombine in the emission layer to produce excitons. The excitons transition and decay from an excited state to a ground state, thereby generating light.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20260026185A1Light-emitting device including organometallic compound, electronic apparatus and electronic equipment including the light-emitting device, and the organometallic compound

Publication Date: 2026.01.22 SAMSUNG DISPLAY CO LTD

AI summary

A light-emitting device includes a first electrode, a second electrode opposite to the first electrode, an interlayer between the first electrode and the second electrode, and an organometallic compound represented by Formula 1. In addition, there are provided an electronic apparatus and electronic equipment each including the light-emitting device, and the organometallic compound represented by Formula 1.