OLED Host Materials for Driving Voltage and Lifetime

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Solution Overview

Problem

Current organic electroluminescent devices (OLEDs) face challenges with high driving voltage, short lifetime, and low luminous efficiency, particularly as luminance increases, necessitating the development of host materials that can enhance these properties.

Innovation Solution

A plurality of host materials comprising specific compounds represented by Formulas 1 and 2 are used in the organic electroluminescent device, which can be combined in various ratios and deposited in light-emitting layers to achieve low driving voltage, high luminous efficiency, and extended lifetime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional host materials are used in OLEDs, then the device can operate, but the driving voltage is high and lifetime is short

Engineering Contradiction:

ImproveOLED lifetimeVSAvoiddriving voltage

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent employs composite host materials comprising multiple organic compounds with specific molecular structures (Formulas 1 and 2) that work synergistically to reduce driving voltage and extend OLED lifetime while maintaining high luminous efficiency

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If luminance of OLED is increased, then display quality improves, but lifetime becomes shorter

Engineering Contradiction:

ImproveluminanceVSAvoidOLED lifetime

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent modifies the chemical and physical parameters of the host materials through specific molecular designs (Formulas 1 and 2) to optimize the balance between luminance and lifetime, enabling high luminance operation without significant lifetime degradation

Inventive Principle:

Principle #35Parameter changes

3Productivity

If conventional host materials are used, then device fabrication is simple, but luminous efficiency is low

Engineering Contradiction:

Improveluminous efficiencyVSAvoidhost material structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent introduces local structural features at specific positions within the host material molecules (as defined in Formulas 1 and 2) to enhance luminous efficiency without requiring complex overall material structures or additional device components

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 use of these host materials results in OLEDs with improved driving voltage, luminous efficiency, and extended lifespan, comparable to or exceeding conventional host combinations, while maintaining efficient light emission.

Implementation Method 1

an organic electroluminescent device comprising an anode; a cathode; and at least one light-emitting layer between the anode and the cathode

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20250017106A1Plurality of host materials and organic electroluminescent device comprising the same

Publication Date: 2025.01.09 DUPONT SPECIALTY MATERIALS KOREA LTD

AI summary

The present disclosure relates to a plurality of host materials, and an organic electroluminescent device comprising the same. By comprising a specific combination of compounds according to the present disclosure as a plurality of host materials, it is possible to provide an organic electroluminescent device having improved luminous efficiency, and/or lifetime properties compared to conventional organic electroluminescent devices.