Anthracene Derivative Host-Dopant System for OLED Efficiency

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Solution Overview

Problem

Current organic electronic devices face inefficiencies due to the lack of stable and efficient materials for their organic material layers, particularly in organic light emitting devices, which affects their performance in terms of efficiency, driving voltage, and stability.

Innovation Solution

A novel anthracene derivative is synthesized, capable of functioning as a hole injecting, transporting, electron injecting, and emitting material, and can be used alone or as a host/dopant in a host/dopant system, enhancing the performance of organic electronic devices by improving efficiency, reducing driving voltage, and increasing stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic materials are used in organic electronic devices, then the device structure can be established, but the efficiency is lowered and driving voltage is high due to material instability and inefficiency

Engineering Contradiction:

Improvedevice efficiencyVSAvoidmaterial stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The anthracene derivative is designed to perform multiple functions simultaneously: it serves as a host material for light emission, a charge transporting material, and stabilizes the organic layer. This multi-functionality resolves the contradiction by eliminating the need for separate specialized materials, thereby improving overall device efficiency while maintaining structural stability through the single compound's inherent properties.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention uses a composite molecular structure combining anthracene core with specific substituents (carbazole, triphenylamine, or dibenzofuran groups) to create a material with enhanced stability and efficiency. The composite structure integrates electron-donating groups with the anthracene acceptor, creating a balanced material that simultaneously achieves high efficiency and stability.

Inventive Principle:

Principle #40Composite materials

2Power

If conventional organic materials are used in organic electronic devices, then the device can operate, but the driving voltage remains high due to material inefficiency

Engineering Contradiction:

Improvedriving voltageVSAvoidmaterial efficiency

Core Design Contradiction:

PowerVSProductivity

Solution Approach 1:

The anthracene derivative modifies key material parameters including HOMO-LUMO energy levels, charge mobility, and excited state lifetimes. By optimizing these parameters through molecular design, the material enables lower driving voltage operation while maintaining or improving device efficiency, directly resolving the contradiction between power consumption and productivity.

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If conventional organic materials are used in organic electronic devices, then the device structure is maintained, but the lifespan and stability are reduced

Engineering Contradiction:

Improvedevice lifespanVSAvoidorganic layer stability

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The anthracene derivative provides prior cushioning against degradation by its stable molecular structure that resists oxidation and other degradation mechanisms. The material's inherent stability acts as a protective buffer, preventing premature failure of the organic electronic device and extending its operational lifespan while maintaining layer integrity.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 anthracene derivative enhances the efficiency, reduces driving voltage, and improves the stability and lifespan of organic electronic devices, particularly in organic light emitting devices, by effectively serving multiple material functions within the device.

Implementation Method 1

a dopant having an energy band interval lower than that of a host constituting the light emitting layer is mixed with the light emitting layer in a small amount, an exciton that is generated from the light emitting layer is transported to the dopant to emit light at high efficiency

Methodology Applied

Scientific EffectEnergy transfer:

Implementation Method 2

organic light emission means that electric energy is converted into light energy by using an organic material

Methodology Applied

Scientific EffectOrganic light emission: Electroluminescence

Implementation Method 3

When the hole meets the electron, an exciton is generated, and light is generated when the exciton is converted into a bottom state

Methodology Applied

Scientific EffectLight emission from exciton transition: Luminescence

Data Source

PatentUS7973306B2Anthracene derivatives, organic electronic devices using anthracene derivatives, and electronic apparatuses comprising organic electronic device

Publication Date: 2011.07.05 LG CHEM LTD

AI summary

Disclosed in an anthracene derivative, an organic electronic device using the anthracene derivative, and an electronic apparatus including the organic electronic device. The anthracene derivative is capable of being used as a hole injecting material, a hole transporting material, an electron injecting material, an electron transporting material, and a light emitting material in an organic electronic device including an organic light emitting device. In particular, the anthracene derivative is capable of being used alone as a light emitting material and a host or a dopant in a host/dopant system. The organic electronic device is excellent in views of efficiency, driving voltage, life time, and stability.