Anthracene-Based Compound for Low-Voltage OLEDs

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Solution Overview

Problem

Conventional organic light emitting devices face issues with high driving voltage and reduced efficiency when operated at high temperatures, and they have limitations in manufacturing high-resolution pixels due to expensive vacuum systems and shadow masks.

Innovation Solution

An anthracene-based compound with a pyridinylquinoline-based or pyridinylisoquinoline-based group is used to form an organic layer, which offers high solubility, thermal stability, and excellent electron injecting and transporting capabilities, enabling low driving voltage and high efficiency in organic light emitting devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional organic light emitting devices are operated at high temperature, then brightness is maintained, but driving voltage increases and efficiency reduces

Engineering Contradiction:

Improveoperating temperatureVSAvoiddriving voltage

Core Design Contradiction:

TemperatureVSUse of energy by moving object

Solution Approach 1:

The patent introduces a novel electron transport material with specific molecular structure (containing electron-transporting groups) that changes the operational parameters of the device, enabling stable operation at high temperature with reduced driving voltage compared to conventional materials

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite material design by combining specific functional groups (electron-transporting groups) with organic compound structures to create a new material class that simultaneously provides thermal stability and efficient electron transport at elevated temperatures

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If vacuum deposition method is used to manufacture organic light emitting devices, then organic layer is formed, but manufacturing cost increases due to expensive vacuum systems

Engineering Contradiction:

Improvemanufacturing methodVSAvoidmanufacturing cost

Core Design Contradiction:

Ease of manufactureVSUse of energy by stationary object

Solution Approach 1:

The patent replaces the mechanical vacuum deposition system with a solution-based coating method, substituting complex vacuum equipment with simpler solution processing techniques that are more cost-effective and easier to manufacture

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs solution-based coating methods (liquid phase deposition) instead of vacuum-based methods, using liquid solutions to deposit organic materials, thereby eliminating the need for expensive vacuum systems

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Manufacturing precision

If shadow mask is used to prepare pixels for natural color display, then color purity is achieved, but manufacturing of high resolution pixels becomes difficult

Engineering Contradiction:

Improvepixel resolutionVSAvoidpixel fabrication

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent replaces the mechanical shadow mask method with solution-based patterning techniques, enabling direct fabrication of high-resolution pixels without the limitations of shadow mask alignment and physical constraints

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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-based compound results in organic light emitting devices with low driving voltage, high efficiency, and improved thermal stability, allowing for stable operation and enhanced color purity, even at elevated temperatures.

Implementation Method 1

excellent electron injecting and transporting capabilities

Methodology Applied

Scientific EffectElectron transport: Conduction (electrical)

Implementation Method 2

emit light by recombination of electrons and holes in a thin layer made of a fluorescent or phosphorescent organic compound (an organic layer) when a current is applied to the organic layer

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

high solubility, thermal stability, and excellent electron injecting and transporting capabilities

Methodology Applied

Scientific EffectThermal stability:

Data Source

PatentUS8367219B2Anthracene-based compound and organic light emitting device employing the same

Publication Date: 2013.02.05 SAMSUNG DISPLAY CO LTD

AI summary

Provided are an anthracene-based compound represented by Formula 1 or 2 and an organic light emitting device employing the same:where R is a hydrogen atom, a halogen atom, a cyano group, a hydroxyl group, a substituted or unsubstituted C1-C20 alkyl group, a substituted or unsubstituted C3-C20 cycloalkyl group, a substituted or unsubstituted C5-C30 heterocycloalkyl group, a substituted or unsubstituted C1-C20 alkoxy group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C6-C30 aralkyl group or a substituted or unsubstituted C2-C30 heteroaryl group, L is a bivalent linking group and a substituted or unsubstituted C6-C30 arylene group or a substituted or unsubstituted C2-C30 heteroarylene group, and m is an integer of 0 to 3.