Heterocyclic OLED Layer Material for Low-Voltage Light Emission

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Solution Overview

Problem

Existing organic light-emitting devices face challenges in enhancing performance, lifetime, and efficiency, particularly in terms of material development for the organic thin film layers.

Innovation Solution

A heterocyclic compound represented by Chemical Formula 1 and 2 is used in the organic material layers, which can function as a hole injection, electron blocking, hole transport, light emitting, electron transport, or hole blocking layer material, adjusting band gap and T1 value to improve hole transfer ability and electron blocking, thereby reducing driving voltage and enhancing light efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic thin film materials are used, then the device can operate, but the performance, lifetime, and efficiency are limited

Engineering Contradiction:

Improvedevice lifetimeVSAvoidmaterial development progress

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent modifies molecular parameters of organic compounds by introducing specific heterocyclic structures with adjustable substituents (R1-R6, X1-X4, L1-L6) to optimize electronic properties such as HOMO-LUMO gaps and charge transfer characteristics, thereby improving device performance and lifetime

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops composite heterocyclic compounds combining multiple functional units (electron transport groups, hole transport groups, blocking groups) within single molecular structures to achieve synergistic effects that enhance overall device efficiency and stability

Inventive Principle:

Principle #40Composite materials

2Productivity

If the organic thin film material is optimized for high efficiency, then light emission efficiency improves, but driving voltage increases

Engineering Contradiction:

Improvelight emission efficiencyVSAvoiddriving voltage

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent introduces different functional groups at specific positions within the heterocyclic structure to create localized electron-rich and electron-poor regions, enabling optimized charge separation and transport that simultaneously improves emission efficiency and maintains low driving voltage

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent adjusts molecular parameters including substituent types (aryl, heteroaryl, alkyl groups) and structural configurations to fine-tune the energy level alignment between HOMO and LUMO, achieving optimal balance between efficiency and voltage requirements

Inventive Principle:

Principle #35Parameter changes

3Speed

If the band gap is reduced to improve hole transfer ability, then charge transport improves, but electron blocking capability deteriorates

Engineering Contradiction:

Improvehole transfer abilityVSAvoidelectron blocking capability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent divides the heterocyclic structure into distinct functional segments: electron transport units, hole transport units, and blocking units, each with specific substituents that provide targeted functionality while maintaining overall molecular coherence

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates localized electronic properties within different regions of the molecule by strategically placing electron-donating and electron-withdrawing groups, enabling simultaneous optimization of hole transfer (through reduced band gap regions) and electron blocking (through localized blocking groups)

Inventive Principle:

Principle #3Local quality

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 lowers the driving voltage, improves light emission efficiency, and enhances the thermal stability and lifetime of organic light-emitting devices by spatially separating HOMO and LUMO through strong charge transfer.

Implementation Method 1

spatially separating HOMO and LUMO through strong charge transfer

Methodology Applied

Scientific EffectCharge transfer:

Implementation Method 2

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

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20260007070A1Heterocyclic compound, organic light-emitting element comprising same, and composition for organic layer

Publication Date: 2026.01.01 LT MATERIALS CO LTD

AI summary

The present specification relates to a heterocyclic compound represented by Chemical Formula 1, an organic light emitting device including the same, and a composition for an organic material layer.