Fluorene-Amine Compound for OLED Hole Transfer and Electron Blocking

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Solution Overview

Problem

Current organic light emitting devices face challenges in enhancing performance, lifetime, and efficiency due to limitations in materials used for the organic thin film, particularly in hole injection, hole transfer, electron blocking, and light emission functions.

Innovation Solution

A compound represented by Chemical Formula 1 is introduced, which can function as a hole injection material, hole transfer material, electron transfer material, or electron blocking material, optimizing the fluorene skeleton's band gap and T1 values to improve efficiency and driving properties, and incorporating amine derivatives to enhance hole transfer ability and thermal stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic thin film materials are used, then device structure is simple, but performance, lifetime and efficiency are insufficient

Engineering Contradiction:

Improvedevice lifetimeVSAvoidmaterial structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs composite material design by combining fluorene skeleton with amine derivative groups (such as carbazole, triphenylamine) to create compound materials that exhibit superior hole injection, hole transfer, electron blocking, and light emission properties simultaneously, resolving the contradiction between device lifetime improvement and material structure complexity

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes molecular parameters of the organic compound including HOMO/LUMO energy levels, band gap, and T1 values by modifying the fluorene skeleton substitution patterns and amine derivative configurations, thereby achieving enhanced device performance without excessive structural complexity

Inventive Principle:

Principle #35Parameter changes

2Productivity

If hole transfer ability is enhanced using amine derivatives, then hole transfer efficiency improves, but thermal stability may be compromised

Engineering Contradiction:

Improvehole transfer efficiencyVSAvoidthermal stability

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The patent applies local quality principle by strategically positioning amine derivative groups (carbazole, triphenylamine) at specific locations on the fluorene skeleton and using substituted alkyl groups (such as tert-butyl) at other positions to provide thermal stability, achieving both high hole transfer efficiency and thermal stability through spatially differentiated functional groups

Inventive Principle:

Principle #3Local quality

3Use of energy by moving object

If driving voltage is reduced, then energy consumption decreases, but light emission efficiency may be affected

Engineering Contradiction:

Improveenergy consumptionVSAvoidlight emission efficiency

Core Design Contradiction:

Use of energy by moving objectVSLoss of energy

Solution Approach 1:

The patent optimizes the energy level parameters (HOMO/LUMO levels) and optical parameters (band gap, T1 values) of the compound by adjusting fluorene skeleton substitution patterns and amine derivative configurations, achieving a balance that enables low driving voltage operation while maintaining high light emission efficiency through proper energy level alignment

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 compound lowers driving voltage, enhances light emission efficiency, and improves the lifetime of organic light emitting devices by optimizing hole transfer and electron blocking capabilities, while maintaining thermal stability and preventing electron invasion.

Implementation Method 1

An organic light emitting device has a structure disposing an organic thin film between two electrodes. When a voltage is applied to an organic light emitting device having such a structure, electrons and holes injected from the two electrodes bind and pair in the organic thin film, and light emits as these annihilate.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

when using an amine derivative as a hole transfer layer, the unshared electron pair of the amine improves the flow of holes enhancing a hole transfer ability of the hole transfer layer

Methodology Applied

Scientific EffectCharge transfer:

Implementation Method 3

when used as an electron blocking layer, deterioration of a hole transfer material caused by electrons invading the hole transfer layer can be suppressed

Methodology Applied

Scientific EffectElectron blocking:

Data Source

PatentUS20230320201A1Compound and organic light-emitting device including same

Publication Date: 2023.10.05 LT MATERIALS CO LTD

AI summary

The present specification relates to a compound represented by Chemical Formula 1, and an organic light emitting device including the same.