Fused Polycyclic Compound for OLED Service Life

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing organic electroluminescence (OEL) elements face challenges in achieving low driving voltage, high luminous efficiency, and long service life, which are essential for stable display performance.

Innovation Solution

A light emitting element is designed with a fused polycyclic compound incorporated in its functional layers, specifically in the emission layer, hole transport region, and electron transport region, to enhance the element's service life and display quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If conventional organic electroluminescence materials are used, then the device can achieve basic light emission, but the service life is insufficient

Engineering Contradiction:

Improveservice lifeVSAvoiddisplay performance stability

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent modifies the molecular structure of organic electroluminescence materials by introducing specific fused polycyclic frameworks and substituent groups, changing the chemical parameters to improve both service life and display performance stability simultaneously

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses composite organic compound structures combining fused polycyclic cores with various functional substituents (amine groups, alkyl groups, aryl groups, heteroaryl groups) to create materials that achieve both long service life and stable display performance

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If materials for high luminous efficiency are developed, then light emission performance improves, but driving voltage remains high

Engineering Contradiction:

Improveluminous efficiencyVSAvoiddriving voltage

Core Design Contradiction:

Use of energy by moving objectVSPower

Solution Approach 1:

The patent optimizes the HOMO-LUMO energy levels and charge transport properties by selecting specific fused polycyclic frameworks and substituent combinations, changing the electrical parameters to achieve high luminous efficiency at reduced driving voltages

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention introduces different substituent groups at specific positions on the fused polycyclic core to create local functional zones that optimize charge injection, transport, and recombination separately, improving luminous efficiency without requiring high overall voltage

Inventive Principle:

Principle #3Local quality

3Duration of action of stationary object

If organic electroluminescence elements are designed for long service life, then durability improves, but luminous efficiency decreases

Engineering Contradiction:

Improveservice lifeVSAvoidluminous efficiency

Core Design Contradiction:

Duration of action of stationary objectVSUse of energy by moving object

Solution Approach 1:

The patent simultaneously optimizes multiple parameters including molecular weight, glass transition temperature, charge carrier mobility, and energy levels by selecting specific fused polycyclic frameworks and substituent combinations to achieve both long service life and high luminous efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention designs fused polycyclic compounds that perform multiple functions simultaneously: they provide structural stability for long service life, optimize charge transport for high efficiency, and enable efficient exciton management, making the material universally effective for all these requirements

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 use of the fused polycyclic compound improves the service life of the light emitting element, leading to excellent display quality with enhanced luminous efficiency and reduced degradation over time.

Implementation Method 1

fluorescence emission using triplet-triplet annihilation (TTA) in which singlet excitons are generated by the collision of triplet excitons

Methodology Applied

Scientific EffectTriplet-triplet annihilation (TTA):

Implementation Method 2

thermally activated delayed fluorescence (TADF) materials that use delayed fluorescence phenomenon

Methodology Applied

Scientific EffectDelayed fluorescence:

Data Source

PatentUS20250151618A1Light emitting element, fused polycyclic compound for the same, and display device including the same

Publication Date: 2025.05.08 SAMSUNG DISPLAY CO LTD

AI summary

Embodiments provide a fused polycyclic compound and a light emitting element. The light emitting element includes a first electrode, a second electrode disposed on the first electrode, and at least one functional layer disposed between the first electrode and the second electrode and including the fused polycyclic compound. The fused polycyclic compound is represented by Formula 1, which is explained in the specification: