Deuterated Anthracene Hosts for OLED Lifetime

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Solution Overview

Problem

There is a continuing need for new host compounds in organic electronic devices that improve electroluminescent performance, particularly in terms of lifetime, quantum efficiency, and color saturation, which existing aryl-substituted anthracene derivatives have not adequately addressed.

Innovation Solution

The development of aryl-substituted anthracene compounds that are at least partially deuterated, which are used as active layers in organic electronic devices, enhancing their electroluminescent properties by increasing the deuterium content to 10% or more, thereby improving device performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing aryl-substituted anthracene derivatives are used as host compounds, then device structure and basic electroluminescent function are maintained, but device lifetime and air tolerance are insufficient

Engineering Contradiction:

Improvedevice lifetimeVSAvoidair tolerance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by substituting hydrogen atoms with deuterium atoms in the anthracene host compound structure. This isotopic substitution modifies the vibrational frequencies and chemical stability parameters of the molecule, resulting in enhanced device lifetime and improved air tolerance without fundamentally changing the device structure or electroluminescent function.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If deuterated compounds are introduced to improve lifetime and air tolerance, then device performance is enhanced, but material processing and purification complexity increases

Engineering Contradiction:

Improvedevice lifetimeVSAvoidmaterial processing

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent utilizes parameter changes through deuterium substitution, which while improving device lifetime and air tolerance, inherently complicates material synthesis and purification processes due to the need for specialized deuterated precursors and handling procedures.

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 deuterated anthracene compounds significantly increase the lifetime of organic electronic devices while maintaining high quantum efficiency and color saturation, and demonstrate greater air tolerance, leading to improved processing and purification of materials.

Implementation Method 1

The organic active layer emits light through the light-transmitting electrical contact layer upon application of electricity across the electrical contact layers

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentEP2401341B1Deuterated compounds for electronic applications

Publication Date: 2017.01.18 EI DU PONT DE NEMOURS & CO

AI summary

This invention relates to deuterated aryl-anthracene compounds that are useful in electronic applications. It also relates to electronic devices in which the active layer includes such a deuterated compound.