Triafluorene Aryl Compounds for OLED Electron Transport

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Solution Overview

Problem

There is a need for organic semiconductor materials and layers with improved electron mobility and electrochemical stability to enhance the performance of organic electronic devices, such as OLEDs, particularly for large-size flat panel displays, while maintaining low operating voltage and power consumption.

Innovation Solution

A compound with a specific formula comprising a triazine group, fluorene group, and aryl group is developed, which can be used as a matrix material in organic semiconductor layers, enhancing electron transport and injection properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic semiconductor materials are used, then device structure is simple, but electron mobility is low and electrochemical stability is insufficient

Engineering Contradiction:

Improveelectrochemical stabilityVSAvoidcompound structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies composite materials by combining triazine, fluorene, and aryl groups into a single molecular structure (Formula 1). This composite approach integrates multiple functional moieties that collectively provide both high electron mobility and electrochemical stability, resolving the contradiction between reliability improvement and structural complexity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs parameter changes by modifying molecular structure parameters (introducing specific heteroatoms, adjusting conjugation length, optimizing substituent positions) to achieve optimal balance between electron mobility and electrochemical stability. The systematic variation of structural parameters in Formula 1 allows tuning of electronic properties without proportionally increasing complexity.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If organic semiconductor layers with improved electron mobility are developed, then device efficiency increases, but manufacturing complexity increases

Engineering Contradiction:

Improvedevice efficiencyVSAvoidmanufacturing simplicity

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent applies segmentation by dividing the complex molecular structure into distinct functional segments (triazine core, fluorene units, aryl substituents). Each segment contributes specific properties (electron affinity, mobility, stability), allowing independent optimization while maintaining overall manufacturability through modular synthesis approaches.

Inventive Principle:

Principle #1Segmentation

3Use of energy by moving object

If operating voltage is reduced to lower power consumption, then battery life extends, but device performance may deteriorate

Engineering Contradiction:

Improvepower consumptionVSAvoiddevice performance

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent uses parameter changes by optimizing the HOMO-LUMO energy gap and electron affinity of the organic semiconductor material to achieve low operating voltage. The specific molecular parameters in Formula 1 are tuned to facilitate efficient charge injection and transport at reduced voltage, simultaneously improving power consumption and maintaining performance.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3483154A1Compounds comprising triazine, fluorene and aryl groups and their use in organic electronic devices

Publication Date: 2019.05.15 NOVALED GMBH

Figure 1~3
Figure 4~6

AI summary

The present invention relates to a compound accoprding to formula I: suitable for use as a layer material for electronic devices, and to an organic semiconductor layer comprising at least one compound thereof, as well as to an organic electronic device comprising at least one an organic semiconductor layer thereof, and a method of manufacturing the same.