Semiconducting Compound for OLED Lifetime and Efficiency

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

There is a need to improve the performance of organic electroluminescent devices, particularly in terms of lifetime without impairing operational voltage and device efficiency.

Innovation Solution

A compound of the formula E-A1-A2-A3 is used, where E is a charge transport structural moiety selected from heteroaryl, aryl, and aromatic rings, and A1, A2, and A3 are specifically bonded to each other, forming a semiconducting material that can be used in the electron transport layer of OLEDs to enhance electron transport and balance hole and electron injection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If conventional electron transport materials are used in OLEDs, then device efficiency and operational voltage are maintained, but device lifetime is limited

Engineering Contradiction:

Improvedevice lifetimeVSAvoidoperational stability

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent modifies the molecular structure of electron transport materials by introducing specific substituents (such as fluorine atoms, alkyl groups, or aryl groups) at defined positions on the core heterocyclic structure. These parameter changes in molecular composition and structure optimize the material's electronic properties, including LUMO energy levels and electron mobility, thereby extending device lifetime while maintaining operational stability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite electron transport materials that combine multiple functional groups and heterocyclic units (such as triazine, pyrimidine, or pyridine rings with specific substituents) to create materials with synergistic properties. This composite approach allows the material to simultaneously provide long-term stability and reliable operational characteristics

Inventive Principle:

Principle #40Composite materials

2Duration of action of stationary object

If electron transport materials are optimized for lifetime, then device lifetime improves, but device efficiency may be compromised

Engineering Contradiction:

Improvedevice lifetimeVSAvoiddevice efficiency

Core Design Contradiction:

Duration of action of stationary objectVSProductivity

Solution Approach 1:

The patent carefully adjusts molecular parameters such as substituent types, positions, and concentrations to optimize the balance between lifetime and efficiency. By modifying electronic structure parameters (HOMO/LUMO levels, band gap) through controlled substitution, the material achieves both extended lifetime and maintained or improved efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces functional groups with specific local properties at strategic positions on the molecular structure. For example, electron-withdrawing groups are placed at positions that enhance stability without significantly impacting charge transport pathways, thereby locally optimizing properties to achieve both lifetime extension and efficiency preservation

Inventive Principle:

Principle #3Local quality

3Productivity

If electron transport materials are optimized for efficiency, then device efficiency improves, but operational voltage may increase

Engineering Contradiction:

Improvedevice efficiencyVSAvoidoperational voltage

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent modifies molecular energy level parameters (particularly LUMO levels) through substituent selection and positioning. By adjusting these energy parameters, the material achieves improved electron transport efficiency while maintaining favorable voltage characteristics through optimized energy alignment with adjacent layers

Inventive Principle:

Principle #35Parameter changes

4Productivity

If balanced charge injection is achieved, then device efficiency improves, but device complexity increases

Engineering Contradiction:

Improvedevice efficiencyVSAvoidmaterial structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent designs electron transport materials that simultaneously perform multiple functions: electron transport, hole blocking, and interface stabilization. This multi-functionality is achieved through molecular structures that combine electron-accepting heterocyclic cores with functional groups that provide additional properties, thereby achieving balanced charge injection without proportionally increasing complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges multiple functional groups and heterocyclic units into a single integrated molecular structure. By combining electron transport functionality with stability-enhancing and charge-balancing groups in one molecule, the patent achieves balanced charge injection while avoiding the need for multiple separate layers or materials

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP4198026A1Compounds for use in semiconductiong materials suitable for electronic devices

Publication Date: 2023.06.21 NOVALED GMBH

Figure 1
Figure 2
Figure 3

AI summary

Compound having the formula (I): E-A1-A2-A3 (I), and to a semiconducting material and to an electronic device comprising the same.