Carbazole-Based Organic Compound for OLED Voltage and Lifetime

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Solution Overview

Problem

There is a continuous need for developing new materials to improve the efficiency and stability of organic light emitting devices, particularly in reducing driving voltage and enhancing light efficiency and lifetime characteristics.

Innovation Solution

A compound represented by Chemical Formula 1 is introduced, which can be used in the organic light emitting device, comprising specific substituents and structural components, and is incorporated into various organic material layers to enhance the device's performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If conventional organic materials are used in organic light emitting devices, then the device structure can be maintained, but the driving voltage remains high and light efficiency and lifetime characteristics are insufficient

Engineering Contradiction:

Improvedriving voltageVSAvoidlight efficiency and lifetime characteristics

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent applies parameter changes by modifying the molecular structure of organic materials through chemical substitution. Specifically, it introduces compounds with carbazole groups combined with electron-withdrawing groups (cyano, carbonyl, ester, or amide groups) at specific positions. This structural parameter change optimizes the HOMO-LUMO energy levels, electron mobility, and thermal stability, thereby reducing driving voltage while improving light efficiency and device lifetime.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by combining carbazole backbone structures with various electron-withdrawing substituent groups. The compound integrates multiple functional groups (carbazole, cyano, carbonyl, ester, or amide) into a single molecular structure, creating a composite organic material that simultaneously achieves low driving voltage, high light efficiency, and improved stability through synergistic effects of the different functional groups.

Inventive Principle:

Principle #40Composite materials

2Productivity

If new organic materials are developed to improve light efficiency and reduce driving voltage, then device performance improves, but material complexity and synthesis difficulty increase

Engineering Contradiction:

Improvelight efficiencyVSAvoidmaterial synthesis difficulty

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent applies segmentation by dividing the complex organic material into modular functional units: a carbazole core structure and separate electron-withdrawing substituent groups. This modular design allows systematic variation of properties by changing individual substituents while maintaining the core structure, simplifying the development process and enabling targeted optimization of light efficiency without proportionally increasing overall complexity.

Inventive Principle:

Principle #1Segmentation

3Duration of action of stationary object

If organic material layers are optimized for better performance, then light efficiency and lifetime improve, but device structure complexity increases

Engineering Contradiction:

Improvedevice lifetimeVSAvoidorganic material layer structure

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The patent applies universality by designing a multi-functional organic compound that simultaneously serves multiple roles: it acts as a host material, charge transport medium, and stability-enhancing component within the organic light emitting device. The carbazole-based compound with electron-withdrawing groups provides both electron transport capability and thermal stability, reducing the need for separate functional layers and thereby improving device lifetime without proportionally increasing structural complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 the driving voltage, improves light efficiency, and extends the lifetime of the organic light emitting device through thermal stability, as demonstrated in various examples of organic light emitting device structures.

Implementation Method 1

An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy by using an organic material

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

The compound lowers the driving voltage of the organic light emitting device, and improves the light efficiency, and lifetime characteristics of the device by thermal stability of the compound

Methodology Applied

Scientific EffectThermal stability:

Data Source

PatentUS10811615B2Compound and organic light emitting element comprising same

Publication Date: 2020.10.20 LG CHEM LTD

AI summary

The present application relates to a compound and an organic light emitting device comprising the same.