Naphthalene-Based Host Materials for OLED Driving Voltage Reduction

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Solution Overview

Problem

There is a need for organic electroluminescent compounds and host materials that can produce OLEDs with low driving voltage, high luminous efficiency, and long lifespan characteristics, which are not adequately met by existing materials.

Innovation Solution

An organic electroluminescent compound represented by a specific formula, comprising a naphthalene ring with various substituents, is used to create host materials that improve the efficiency and lifespan of OLEDs by forming a light-emitting layer with dopants.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional light-emitting materials are used in OLEDs, then the device structure can be maintained, but the luminous efficiency and lifespan are insufficient

Engineering Contradiction:

Improveluminous efficiencyVSAvoidlifespan

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the molecular structure parameters of host materials by introducing specific substituents (R1-R6) on the naphthalene core, changing electronic properties such as HOMO-LUMO energy levels and charge mobility. These parameter changes enable more efficient charge transport and exciton management, simultaneously improving luminous efficiency and device lifespan

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates composite light-emitting systems by combining specially designed host materials with dopant materials. The host material provides structural framework and charge transport pathways, while the dopant emits light, creating a synergistic composite system that achieves both high efficiency and long lifespan

Inventive Principle:

Principle #40Composite materials

2Power

If existing host materials are used, then the device can operate, but the driving voltage remains high

Engineering Contradiction:

Improvedriving voltageVSAvoidluminous efficiency

Core Design Contradiction:

PowerVSProductivity

Solution Approach 1:

The patent optimizes key parameters including HOMO/LUMO energy levels, charge mobility, and molecular packing density through systematic substitution patterns. These changes reduce the energy barrier for charge injection and transport, lowering driving voltage while maintaining or enhancing luminous efficiency

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 use of this compound and host materials results in OLEDs with reduced driving voltage and enhanced luminous efficiency and lifespan, addressing the limitations of conventional materials.

Implementation Method 1

An organic electroluminescent device (OLED) was first developed by Eastman Kodak in 1987, by using small aromatic diamine molecules and aluminum complexes as materials for forming a light-emitting layer

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20230165142A1Organic electroluminescent compound, a plurality of host materials comprising the same, and organic electroluminescent device

Publication Date: 2023.05.25 DUPONT SPECIALTY MATERIALS KOREA LTD

AI summary

The present disclosure relates to an organic electroluminescent compound, a plurality of host materials comprising the same, and an organic electroluminescent device. By comprising an organic electroluminescent compound according to the present disclosure and a plurality of host materials comprising the same, an organic electroluminescent device having a low driving voltage and/or a high luminous efficiency and/or a long lifespan can be prepared.