Cyclic Compound Matrix Materials for Long-Life OLEDs

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Solution Overview

Problem

Existing organic electroluminescent devices face challenges in improving lifetime, efficiency, operating voltage, color purity, and refractive index, particularly in red- and yellow-phosphorescing devices, with a need for better matrix materials.

Innovation Solution

Development of cyclic compounds with specific structures, such as formula (I), which can be used as matrix materials, hole transport materials, or electron blockers, enhancing device performance by improving lifetime, efficiency, and reducing operating voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional matrix materials are used in organic electroluminescent devices, then device operation is achieved, but lifetime and efficiency are insufficient

Engineering Contradiction:

Improvedevice lifetimeVSAvoidenergy efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent modifies the molecular structure of matrix materials by introducing specific cyclic compounds with defined chemical formulas (I), changing physical parameters such as refractive index (0.15-0.30 range) and HOMO/LUMO energy levels to optimize both lifetime and energy efficiency simultaneously

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates composite matrix materials combining cyclic compounds with conventional organic electroluminescent materials, where the cyclic compounds serve as host materials with optimized properties that enhance both lifetime and efficiency of the overall device

Inventive Principle:

Principle #40Composite materials

2Loss of energy

If phosphorescent organometallic complexes are used as emitters, then energy efficiency improves up to four times, but operating voltage and color purity require further improvement

Engineering Contradiction:

Improveenergy efficiencyVSAvoidoperating voltage

Core Design Contradiction:

Loss of energyVSUse of energy by moving object

Solution Approach 1:

The patent optimizes local properties of the matrix material by selecting cyclic compounds with specific HOMO/LUMO energy levels and refractive indices, creating localized energy management zones that reduce operating voltage while maintaining high efficiency

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The cyclic compounds act as intermediary materials between the phosphorescent emitter and the device electrodes, mediating energy transfer and electron/hole transport to reduce operating voltage while preserving the high efficiency benefits of phosphorescent emitters

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If matrix materials are optimized for lifetime, then device durability improves, but refractive index and color purity are compromised

Engineering Contradiction:

Improvedevice lifetimeVSAvoidcolor purity

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The cyclic compounds are designed to perform multiple functions simultaneously: serving as matrix material for lifetime improvement, providing specific refractive index (0.15-0.30) for optical performance, and enabling color purity through controlled energy level alignment, thus resolving the contradiction between durability and optical quality

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250295028A1Cyclic compounds for organic electroluminescent devices

Publication Date: 2025.09.18 MERCK PATENT GMBH

AI summary

The present invention relates to cyclic compounds which are suitable for use in electronic devices, and to electronic devices, in particular organic electroluminescent devices, containing said compounds.