Anthracene Host-Dopant OLED Layer for Low-Voltage Lifetime Gain

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Solution Overview

Problem

Existing organic electroluminescent devices face challenges in achieving optimal energy band gap combinations for host and dopant materials in the light emitting layer, leading to inefficient low-voltage driving and short device lifetime.

Innovation Solution

Employing an anthracene derivative with a specific structure as a host compound and a polycyclic aromatic derivative as a dopant in the light emitting layer, utilizing a compound represented by Formula A, which includes at least one benzofuran or benzothiophene moiety and deuterium atoms, to enhance stability and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional host and dopant materials are used in the light emitting layer, then the device structure is simple, but the low-voltage driving characteristics are poor and device lifetime is short

Engineering Contradiction:

Improvedevice lifetimeVSAvoidmolecular structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by introducing deuterium atoms to replace hydrogen atoms in the anthracene derivative structure. This isotopic substitution modifies the molecular parameters (mass, bond strength, vibrational frequency) without changing the chemical identity, thereby improving device lifetime and low-voltage characteristics while maintaining the fundamental molecular structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by combining the anthracene derivative host compound with specific dopant materials in the light emitting layer. This composite approach creates synergistic effects where the host-guest system achieves improved low-voltage driving characteristics and extended device lifetime that neither component could achieve alone

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If conventional host and dopant combinations are used, then material selection is simple, but energy band gap optimization is insufficient leading to poor low-voltage driving

Engineering Contradiction:

Improvelow-voltage drivingVSAvoidenergy band gap optimization

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent optimizes energy band gap parameters by carefully selecting and combining host and dopant materials with complementary energy levels. The anthracene derivative host is paired with dopants whose LUMO and HOMO levels are strategically positioned to facilitate efficient charge injection and transport at low voltages, achieving optimal energy band alignment

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The anthracene derivative acts as an intermediary material between the electrodes and the dopant in the light emitting layer. It provides stable electrochemical pathways for hole and electron migration, mediating the charge transfer process and enabling efficient low-voltage operation through its specific energy band structure

Inventive Principle:

Principle #24Intermediary (Mediator)

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 compounds results in significantly improved low-voltage driving and extended device lifetime, making them suitable for applications in lighting systems and various displays, including flat panel, flexible, and wearable displays.

Implementation Method 1

electrons injected from an electron injecting electrode (cathode) recombine with holes injected from a hole injecting electrode (anode) in a light emitting layer to form excitons, which emit light while releasing energy

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

an anthracene derivative with a specific structure as a host compound and a polycyclic aromatic derivative as a dopant compound are employed in a light emitting layer, achieving a long lifetime and significantly improved low-voltage characteristics of the device

Methodology Applied

Scientific EffectIsotopic substitution effect:

Data Source

PatentUS12428407B2Organic electroluminescent compound and organic electroluminescent device including the same

Publication Date: 2025.09.30 SFC CO LTD

AI summary

Disclosed are an anthracene derivative with a specific structure and an organic electroluminescent device including the anthracene derivative. The organic electroluminescent device includes a light emitting layer employing the anthracene derivative as a host compound and a polycyclic aromatic derivative with a specific structure as a dopant compound. The use of the host and dopant compounds allows the organic electroluminescent device to have a long lifetime and significantly improved low-voltage characteristics.