Dicyano OLED Host Materials for Longer-Life Phosphorescent Emission

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Solution Overview

Problem

Existing matrix materials in phosphorescent OLEDs, particularly at low to medium emitter concentrations, limit device lifetime and require improvements for enhanced efficiency and operating voltage.

Innovation Solution

The use of dicyano-substituted monoaza or diazadibenzofuran and diazadibenzothiophene derivatives as triplet matrix materials, combined with hole-transporting compounds, in the light-emitting layer of organic electroluminescent devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional electroluminescence materials are used, then device structure and manufacturing process are simple, but luminance is low and viewing angle is narrow

Engineering Contradiction:

ImproveluminanceVSAvoiddevice structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent divides the electroluminescence device into multiple functional layers including hole injection layer, hole transport layer, light-emitting layer, electron transport layer, and electron injection layer. This segmentation allows each layer to be optimized for specific functions, achieving high luminance and wide viewing angle through coordinated layer design while maintaining manufacturability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs composite material systems where the light-emitting layer contains specific compounds (e.g., Alq3, BCP, TPBi) combined in defined weight ratios. These composite material configurations enable simultaneous achievement of high luminance, wide viewing angle, and stable device performance without excessive structural complexity

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If conventional electroluminescence materials are used, then manufacturing process is simple, but viewing angle is narrow

Engineering Contradiction:

Improveviewing angleVSAvoidmanufacturing process

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent applies local quality optimization by selecting specific materials for specific layers based on their functional requirements. For example, the light-emitting layer uses compounds with specific molecular structures (e.g., mCP, TPBi) to achieve wide viewing angle, while other layers use materials optimized for charge transport. This localized material selection achieves wide viewing angle without requiring complex overall manufacturing processes

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent achieves wide viewing angle by changing material parameters such as molecular structure, HOMO/LUMO energy levels, and layer thickness. Specific compounds with predetermined parameters (e.g., Alq3 with specific molecular geometry, BCP with specific energy levels) are selected to optimize viewing angle while maintaining compatibility with standard manufacturing processes

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If conventional electroluminescence materials are used, then device structure is simple, but luminance efficiency is low

Engineering Contradiction:

Improveluminance efficiencyVSAvoiddevice structure

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent implements preliminary action by pre-optimizing the light-emitting layer composition and thickness before device operation. The layer is designed with specific materials (e.g., Alq3, BCP, TPBi) in predetermined ratios to ensure high luminance efficiency from the outset. This preliminary optimization achieves high energy efficiency without requiring complex operational control mechanisms

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces mechanical or simple structural approaches with chemically optimized material systems. Instead of relying on complex device structures to achieve high luminance efficiency, the invention uses carefully selected organic compounds with specific molecular properties and energy level alignments in the light-emitting layer to achieve efficient electroluminescence conversion

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Improves device lifetime and performance, especially at low to medium emitter concentrations, by optimizing the properties of matrix materials in phosphorescent OLEDs.

Implementation Method 1

organic electroluminescence device

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentEP4426701B1Benzofuro[3,2-d]pyrimidin-2,4-dicarbonitrile derivatives and similar compounds for organic electroluminescent devices

Publication Date: 2026.05.20 MERCK PATENT GMBH

AI summary

The present invention relates to dicyano-substituted monoaza- or diazadibenzofurane derivatives and dicyano-substituted monoaza- or diazadibenzothiophene derivatives of the formula (1), wherein the following applies to the symbols and indices used: Ring A-| in formula (1) corresponds to formula (1A), Y represents at each instance independently N, C or CR+, wherein at least one Y represents N and at least two Y represent C, to which the CN group is attached; if two Y represent N, they are separated from each other by at least one C-CN group; and V is O or S. The invention also relates to electronic devices comprising these compounds, more particularly organic electroluminescence devices containing these compounds as triplet matrix materials, optionally combined with another triplet matrix material and suitable phosphorescent emitters, and to suitable mixtures and formulations.