Carbazole Derivative Compound for OLED Efficiency and Lifetime

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Solution Overview

Problem

There is a need for new materials in organic light emitting devices to enhance efficiency, reduce driving voltage, and improve lifetime characteristics.

Innovation Solution

A novel compound represented by Chemical Formula 1 is introduced, which can be used in various organic material layers such as hole injection, hole transport, light emission, electron transport, or electron injection layers, improving the efficiency and stability of organic light emitting devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic materials are used in organic light emitting devices, then the device structure is simple, but the efficiency is low and lifetime is short

Engineering Contradiction:

Improvedevice efficiencyVSAvoiddevice lifetime

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The patent modifies the molecular structure of organic compounds by introducing specific substituents (methyl groups at positions 2 and 7 of the carbazole ring, and phenyl groups at positions 1 and 8) to optimize electronic properties. This structural parameter change improves both device efficiency and lifetime by enhancing charge transport and stabilizing the material against degradation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite organic materials with specific molecular architectures combining carbazole core structures with aromatic substituents. These composite materials exhibit synergistic effects where the core provides charge transport capability and the substituents provide structural stability, thereby simultaneously improving efficiency and lifetime

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional organic materials are used in organic light emitting devices, then manufacturing is straightforward, but efficiency and stability are insufficient

Engineering Contradiction:

Improvedevice efficiencyVSAvoiddevice stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent optimizes molecular parameters including HOMO/LUMO energy levels, molecular weight, and structural rigidity by selecting specific substituents. These parameter changes enhance material stability while maintaining manufacturability through conventional deposition techniques

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Instead of modifying device structure to accommodate conventional materials, the patent inverts the approach by designing novel organic materials with optimized properties that can be integrated into standard device architectures, thereby improving efficiency and stability without complicating manufacturing

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If new organic compounds are developed to improve efficiency, then device performance increases, but driving voltage increases

Engineering Contradiction:

Improvedevice efficiencyVSAvoiddriving voltage

Core Design Contradiction:

ProductivityVSPower

Solution Approach 1:

The patent carefully balances energy level parameters of the organic compounds. By optimizing HOMO and LUMO levels through substituent selection, the material achieves high efficiency while maintaining appropriate energy offsets with electrodes, preventing excessive driving voltage

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces functional groups with specific local properties at strategic positions on the molecular structure. Electron-donating methyl groups at positions 2 and 7 and electron-withdrawing phenyl groups at positions 1 and 8 create local electronic environments that optimize both efficiency and voltage characteristics

Inventive Principle:

Principle #3Local quality

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 enhances the efficiency, reduces driving voltage, and extends the lifetime of organic light emitting devices when applied, outperforming comparative examples with similar structures lacking methyl groups.

Implementation Method 1

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

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11459290B2Compound and organic light emitting device using the same

Publication Date: 2022.10.04 LG CHEM LTD

AI summary

The present disclosure relates to a novel compound represented by Chemical Formula 1 and an organic light emitting device using the same. The compound is used as a material of an organic material layer of the organic light emitting device.