Heterocyclic Compound for OLED Driving Voltage and Lifespan

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Solution Overview

Problem

There is a continuous demand for improving the performance, lifespan, and efficiency of organic light-emitting devices, particularly in the development of materials for the organic thin film, which existing technologies have not adequately addressed.

Innovation Solution

A heterocyclic compound represented by Formula 1 is introduced, which can be used as a material for various organic layers in organic light-emitting devices, including hole injection, hole transport, light-emitting, electron transport, and electron injection layers, facilitating lower driving voltage, improved luminous efficiency, and extended lifespan by delocalizing HOMO orbitals and maintaining triplet excitons.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic thin film materials are used, then the device structure is simple, but the performance, lifespan, and efficiency are insufficient

Engineering Contradiction:

Improvedevice performance and lifespanVSAvoidmaterial structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent modifies the molecular structure of organic compounds by changing parameters such as introducing heterocyclic rings, adjusting substituent groups (R1-R6), and varying the core structure (Formula 1) to optimize electronic properties including HOMO delocalization and triplet exciton stability, thereby improving device performance and lifespan

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite organic materials combining heterocyclic compounds with specific substituent groups to create multifunctional organic thin films that simultaneously achieve hole injection, hole transport, light emission, electron transport, and electron injection functions with improved efficiency and stability

Inventive Principle:

Principle #40Composite materials

2Productivity

If existing organic materials are used, then the manufacturing process is simple, but the luminous efficiency and driving voltage are not optimized

Engineering Contradiction:

Improveluminous efficiencyVSAvoidmaterial synthesis complexity

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent optimizes luminous efficiency by changing molecular parameters including introducing electron-donating or electron-withdrawing groups, adjusting the heterocyclic core structure, and modifying substituent positions to control energy levels and charge transport properties, achieving lower driving voltage and higher efficiency

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If conventional materials are used, then the device structure is straightforward, but the triplet excitons are not preserved effectively

Engineering Contradiction:

Improvetriplet exciton preservationVSAvoidmolecular design complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent preserves triplet excitons by changing molecular parameters to achieve high triplet energy levels (T1) through specific heterocyclic structures and substituent combinations, preventing retrograde energy transfer from dopant to host and reducing non-radiative decay

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harm of triplet exciton loss into benefit by designing molecules where the heterocyclic structure and substituent groups work together to stabilize triplet states, transforming what would be energy waste into useful light emission through phosphorescence or delayed fluorescence

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 reduces driving voltage, enhances efficiency, and preserves triplet excitons, leading to improved performance and lifespan of organic light-emitting devices.

Implementation Method 1

improve hole mobility, thereby reducing driving voltage and improving efficiency of the organic light-emitting device

Methodology Applied

Scientific EffectHOMO orbital delocalization:

Implementation Method 2

The heterocyclic compound represented by Formula 1 of the present invention has a high triplet energy level (T1 level), thereby preventing retrograde energy transfer from the dopant to the host, and exhibiting an effect of well preserving triplet excitons in the light-emitting layer

Methodology Applied

Scientific EffectTriplet exciton preservation:

Implementation Method 3

When a voltage is applied to the organic light-emitting device having such a structure, electrons and holes injected from the two electrodes combine in the organic thin film to form a pair, and then emit light while disappearing

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20240023433A1Heterocyclic compound, organic light-emitting device comprising the same, manufacturing method of the same and composition for organic layer of organic light-emitting device

Publication Date: 2024.01.18 LT MATERIALS CO LTD

AI summary

The present specification relates to a heterocyclic compound represented by Formula 1, an organic light-emitting device comprising the same, a manufacturing method thereof, and a composition for an organic layer thereof.