Benzonaphthofuran OLED Hosts with Selective Deuteration

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Solution Overview

Problem

The lifetime of blue organic electroluminescent devices is insufficient due to low bond dissociation energy in anthracene-based host materials containing a dibenzofuran moiety, leading to poor stability and efficiency issues.

Innovation Solution

A long-lifetime organic electroluminescent compound with a benzonaphthofuran moiety and selective deuteration is used as a host material, enhancing stability by dispersing negative charges and reducing carbon-hydrogen bond vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If anthracene-based host materials containing dibenzofuran moiety are used, then device efficiency is improved, but bond dissociation energy decreases and lifetime shortens

Engineering Contradiction:

Improvedevice efficiencyVSAvoidbond dissociation energy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the chemical structure parameter by replacing dibenzofuran with benzonaphthofuran, which fundamentally alters the bond dissociation energy while maintaining efficiency. This structural parameter change resolves the contradiction by achieving both high efficiency and high stability simultaneously

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite molecular structure combining benzonaphthofuran core with specific substituents (fluorene, carbazole, triphen胺 groups) to achieve optimal balance between efficiency and stability. The composite structure leverages the high BDE of benzonaphthofuran while incorporating functional groups for efficient luminescence

Inventive Principle:

Principle #40Composite materials

2Reliability

If aryl substituents are introduced to improve stability, then lifetime is prolonged, but optical properties change and efficiency decreases

Engineering Contradiction:

Improvedevice lifetimeVSAvoiddevice efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies local quality by selectively placing specific aryl substituents (fluorene, carbazole, triphen胺 groups) at specific positions on the benzonaphthofuran core. This localized substitution approach improves stability through high BDE while maintaining optical properties and efficiency by choosing substituents with appropriate electronic characteristics

Inventive Principle:

Principle #3Local quality

3Reliability

If deuteration is performed to improve stability, then lifetime increases, but cost increases and optical properties may be affected

Engineering Contradiction:

Improvedevice lifetimeVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the isotopic parameter by incorporating deuterium atoms at specific positions in the benzonaphthofuran structure. This parameter change strengthens C-D bonds (higher BDE than C-H) to improve lifetime while the strategic placement of deuterium minimizes impact on optical properties and controls manufacturing cost

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 compound significantly prolongs the lifetime of blue organic electroluminescent devices by improving bond dissociation energy and stability, overcoming efficiency and cost challenges of previous solutions.

Implementation Method 1

the conjugated length of π electron cloud is prolonged. When the molecule is converted into an anionic state after accepting electrons, the negative charges can be effectively dispersed on the benzonaphthofuran moiety

Methodology Applied

Scientific EffectCharge delocalization:

Implementation Method 2

only by means of deuteration at some sites on the benzonaphthofuran structure, the vibration of carbon-hydrogen bonds can be significantly reduced, the stability of the benzonaphthofuran can be enhanced

Methodology Applied

Scientific EffectDeuteration effect:

Implementation Method 3

Organic Light-Emitting Diode (OLED) is a display lighting technology developed gradually in recent years

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12439817B2Long-lifetime organic electroluminescent compound and organic electroluminescent device comprising the same

Publication Date: 2025.10.07 SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD

AI summary

There is provided a long-lifetime organic electroluminescent compound and an organic electroluminescent device comprising the same. The general structural formula of the organic electroluminescent compound is as shown in Formula I. The organic electroluminescent compound contains a benzonaphthofuran moiety. By means of the benzonaphthofuran structure instead of dibenzofuran, the conjugated length of π electron cloud is prolonged. When the molecule is converted into an anionic state after accepting electrons, the negative charges can be effectively dispersed on the benzonaphthofuran moiety, avoiding excessively high local energy caused by uneven distribution of the negative charges, thus increasing the stability of a material. Furthermore, the benzonaphthofuran moiety has also been found to have a relatively good planarity, and the stability of the material can be significantly improved by means of partial deuteration. In the present invention, by means of deuteration at some sites on the benzonaphthofuran structure, the vibration of carbon-hydrogen bonds can be significantly reduced, the stability of the benzonaphthofuran can be enhanced, and the deuteration cost can be reduced.