Organic Light-Emitting Material Vector Optimization

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Solution Overview

Problem

Existing light-emitting devices face challenges in achieving high emission efficiency, reliability, and low driving voltage, which are essential for advanced display and lighting applications.

Innovation Solution

The development of a light-emitting apparatus material containing an organic compound or an organometallic complex, where the inner product of a vector A connecting two most distant atoms in the lowest excited state and a vector B representing the transition dipole moment is greater than or equal to 2.5, optimizing the molecular orientation and transition dipole moment for enhanced light emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic compounds are used in light-emitting devices, then the device structure is simple, but the emission efficiency is insufficient

Engineering Contradiction:

Improveemission efficiencyVSAvoidmolecular structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by optimizing the molecular structure of organic compounds through specific design parameters: ensuring the inner product of vector A (connecting two most distant atoms in lowest excited state) and vector B (transition dipole moment) is ≥2.5, and controlling the angle between these vectors to be ≤90°. These parameter optimizations directly improve emission efficiency while maintaining manageable molecular complexity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by creating organometallic complexes that combine organic ligands with metal centers (such as Ir(III), Pt(II), Os(II)). These composite structures integrate the benefits of organic materials (tunability, processability) with metal centers (high quantum yield, phosphorescence), achieving superior emission efficiency

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If conventional organic compounds are used, then the material selection is easy, but the driving voltage remains high

Engineering Contradiction:

Improvedriving voltageVSAvoidmaterial selection

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The patent uses parameter changes by designing organic compounds with specific electronic structure parameters that facilitate charge injection and transport. By controlling the HOMO-LUMO energy levels, molecular packing arrangements, and dipole moments through systematic molecular design, the patent achieves lower driving voltages while maintaining clear material selection criteria

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional organic compounds are used, then the synthesis process is simple, but the reliability is insufficient

Engineering Contradiction:

Improvedevice reliabilityVSAvoidsynthesis process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies composite materials by developing organometallic complexes with well-defined coordination geometries and stable metal-ligand bonds. These composite structures provide enhanced thermal stability, photochemical stability, and device reliability compared to simple organic compounds, while the modular synthesis approach (ligand synthesis followed by metal coordination) keeps the overall process manageable

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs beforehand cushioning by incorporating stabilizing structural features into the molecular design from the outset: rigidifying molecular cores to prevent degradation, introducing sterically protective groups to shield reactive sites, and designing stable coordination environments for metal centers. These preemptive design choices enhance reliability before device operation begins

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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

This approach results in light-emitting devices with high emission efficiency, reliability, and the ability to operate at low driving voltages, making them suitable for various electronic and lighting applications.

Implementation Method 1

Light-emitting devices (also referred to as organic EL elements) including organic compounds and utilizing electroluminescence (EL)

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

Carriers are injected by application of voltage to the device, and recombination energy of the carriers is used, whereby light emission can be obtained from the emission center substance

Methodology Applied

Scientific EffectRecombination energy conversion:

Data Source

PatentUS20250185498A1Light-emitting apparatus material and light-emitting device

Publication Date: 2025.06.05 SEMICON ENERGY LAB CO LTD

AI summary

A light-emitting device having excellent characteristics is provided. A light-emitting apparatus material contains an organic compound. In the light-emitting apparatus material, the inner product of a vector A connecting two most distant atoms in the lowest excited state of the organic compound and a vector B that is a transition dipole moment relating to light emission from the organic compound is greater than or equal to 2.5. The length of the vector A is represented in nm, and the magnitude of the vector B is represented in debye. The direction of the vector A is set such that an angle formed by the vector A and the vector B is less than or equal to 90°.