Heterocyclic OLED Material for Stable Charge Transport and Lifetime

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Solution Overview

Problem

Existing organic light emitting devices require materials that meet specific conditions such as proper energy levels, electrochemical stability, and thermal stability, while also performing various roles depending on substituents.

Innovation Solution

A heterocyclic compound represented by Chemical Formula 1, which can function as a hole injection material, hole transfer material, light emitting material, or electron transfer material, is used in the organic light emitting device, enhancing device lifetime through its electron stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If conventional organic thin film materials are used, then the device can operate with basic light emitting function, but the device lifetime and efficiency are insufficient

Engineering Contradiction:

Improvedevice lifetimeVSAvoidelectrochemical stability

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent modifies the chemical structure of organic thin film materials by introducing specific heterocyclic groups (triazine, pyrimidine, pyridine rings) and substituent patterns to optimize electrochemical stability and energy levels, thereby simultaneously improving device lifetime and reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses composite molecular structures combining multiple heterocyclic units (dibenzofuran, carbazole, triazine/pyrimidine/pyridine groups) to create materials with enhanced electrochemical stability and tailored energy levels for improved device performance and longevity

Inventive Principle:

Principle #40Composite materials

2Reliability

If materials with proper energy levels and stability are selected, then device performance improves, but the complexity of material selection and synthesis increases

Engineering Contradiction:

Improveelectrochemical stabilityVSAvoidmaterial structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent develops heterocyclic compound structures that can serve multiple functions in organic light emitting devices, including hole injection, hole transport, electron transport, and light emission, reducing the need for multiple separate materials and simplifying device structure

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 heterocyclic compound improves the performance and lifetime of organic light emitting devices by providing stable electron emission and versatile material functionality.

Implementation Method 1

When a voltage is applied to an organic light emitting device having such a structure, electrons and holes injected from the two electrodes bind and pair in the organic thin film

Methodology Applied

Scientific EffectCharge carrier injection and transport: Conduction (electrical)

Implementation Method 2

electrons and holes injected from the two electrodes bind and pair in the organic thin film, and light emits as these annihilate

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12534464B2Heterocyclic compound and organic light emitting element comprising same

Publication Date: 2026.01.27 LT MATERIALS CO LTD

AI summary

The present specification relates to a heterocyclic compound represented by Chemical Formula 1, and an organic light emitting device comprising the same.