Polycyclic Fluorene Compound for OLED Efficiency and Lifetime

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Solution Overview

Problem

Current organic light emitting devices face challenges in achieving enhanced efficiency and extended lifetime due to limitations in material development for their organic material layers.

Innovation Solution

A polycyclic compound, specifically a compound with certain substituents at carbon positions 3 and 4 of fluorene, is used in the organic material layers of the device, extending conjugation length and improving electrical and thermal properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic materials are used in the organic material layer, then the device structure is simple, but the efficiency and lifetime are insufficient

Engineering Contradiction:

Improvedevice lifetimeVSAvoidmaterial structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs composite organic materials with specific molecular structures (containing electron-accepting and electron-donating groups) to achieve both high efficiency and long lifetime. The composite material design allows simultaneous optimization of multiple performance parameters without requiring complex device architecture

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies molecular parameters of organic materials, specifically adjusting the conjugation length, electron affinity, and HOMO-LUMO energy levels. By changing these chemical parameters, the device achieves enhanced efficiency and lifetime while maintaining a relatively simple device structure

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional organic materials are used, then the material selection is simple, but the electron transfer capability is insufficient

Engineering Contradiction:

Improveelectron transfer capabilityVSAvoidmaterial composition complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent introduces functional groups with specific local electron transfer properties into the organic material molecules. The electron-accepting and electron-donating groups are positioned at specific locations within the molecular structure to create localized electron transfer pathways, enhancing overall electron transfer capability

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite organic materials combining electron-accepting groups (such as dibenzofuran, dibenzothiophene) with electron-donating groups. This composite molecular structure enables efficient electron transfer while maintaining clear material composition and synthesis pathways

Inventive Principle:

Principle #40Composite materials

3Power

If the organic material layer uses simple materials, then the manufacturing process is simple, but the driving voltage is high

Engineering Contradiction:

Improvedriving voltageVSAvoidmaterial synthesis complexity

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The patent adjusts the HOMO and LUMO energy level parameters of the organic materials to optimize the driving voltage. By modifying molecular structure parameters (such as introducing specific heteroatomic rings and functional groups), the material achieves lower driving voltage while the synthesis process remains feasible through established organic chemistry methods

Inventive Principle:

Principle #35Parameter changes

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 use of this compound results in improved efficiency, reduced driving voltage, and extended lifetime of the organic light emitting device by enhancing electron transfer capability and controlling hole or electron transfer properties.

Implementation Method 1

Methodology Applied

Scientific EffectConjugation extension:

Implementation Method 2

An organic light emission phenomenon generally refers to a phenomenon converting electrical energy to light energy using an organic material

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

Methodology Applied

Scientific EffectCharge transport: Conduction (electrical)

Data Source

PatentUS11569453B2Polycyclic compound and organic light emitting element comprising same

Publication Date: 2023.01.31 LG CHEM LTD

AI summary

Provided is a compound of Chemical Formula 1:where A and B each independently is a substituted or unsubstituted aryl group, a substituted or unsubstituted monocyclic or dicyclic heteroaryl group, a substituted or unsubstituted dibenzofuran group, a substituted or unsubstituted benzonaphthofuran group, a substituted or unsubstituted dibenzothiophene group, a substituted or unsubstituted benzonaphthothiophene group, a substituted or unsubstituted phenoxazine group, a substituted or unsubstituted phenothiazine group, a substituted or unsubstituted phenanthroline group, a substituted or unsubstituted benzoquinoline group, a substituted or unsubstituted arylamine group, a substituted or unsubstituted silyl group, or a substituted or unsubstituted phosphine oxide group, or one of the following substituents:and an organic light emitting device including the same.