OLED Host Material Design for Low Voltage and Long Lifespan

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Solution Overview

Problem

Existing organic electroluminescent devices face challenges in achieving low driving voltage, high luminous efficiency, and long lifespan.

Innovation Solution

A compound represented by Formula 1 and an organic electroluminescent material comprising this compound, along with another compound represented by Formula 2, are used to create an organic electroluminescent device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional phosphorescent materials are used in organic electroluminescent devices, then excellent luminous efficiency is achieved, but driving voltage remains high and lifespan is limited

Engineering Contradiction:

Improveluminous efficiencyVSAvoiddevice lifespan

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent modifies the molecular structure of host materials by introducing specific substituents (such as triphen胺 and carbazole groups) at defined positions of the phenanthrooxazole or phenanthrothiazole core. This structural parameter change optimizes the material's electronic properties, enabling simultaneous achievement of low driving voltage and extended device lifespan while maintaining high luminous efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention employs composite material design by combining phenanthrooxazole or phenanthrothiazole core structures with specific substituent groups (triphen胺, carbazole). This composite approach creates host materials with synergistic properties that resolve the contradiction between efficiency and durability in OLEDs

Inventive Principle:

Principle #40Composite materials

2Device complexity

If conventional host materials are used, then device structure is simple, but driving voltage is high and performance is insufficient

Engineering Contradiction:

Improvematerial structure complexityVSAvoiddriving voltage

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies local quality modification by introducing specific functional groups (triphen胺, carbazole) at particular positions of the host material molecule. This localized structural optimization improves charge transport properties and reduces driving voltage without requiring complete redesign of the entire device structure

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 device exhibits low driving voltage and high luminous efficiency, while also demonstrating a significantly improved lifespan.

Implementation Method 1

organic electroluminescent device

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20250127041A1Compound, and organic electroluminescent material and organic electroluminescent device comprising the same

Publication Date: 2025.04.17 DUPONT SPECIALTY MATERIALS KOREA LTD

AI summary

The present disclosure relates to a compound, and an organic electroluminescent material and an organic electroluminescent device comprising the same. By comprising a compound and/or an organic electroluminescent material according to the present disclosure, an organic electroluminescent device having low driving voltage, and/or high luminous efficiency, and/or long lifespan characteristic, compared to the conventional organic electroluminescent device can be provided.