Fused Polycyclic Compound Host for OLED Efficiency

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Solution Overview

Problem

Existing organic electroluminescence devices face challenges in achieving high efficiency, low driving voltage, and extended lifespan, particularly in the development of materials that consistently meet these requirements.

Innovation Solution

The use of an organic electroluminescence device structure that includes a fused polycyclic compound in the emission layer, with a specific nitrogen-containing substituent and silicon atoms connecting phenyl groups, to enhance emission efficiency and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic electroluminescence device materials are used, then the device structure is simple, but the emission efficiency is low and the device lifespan is short

Engineering Contradiction:

Improveemission efficiencyVSAvoidmaterial structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent employs composite material design by combining a fused polycyclic compound core with multiple phenyl groups and nitrogen-containing substituents. This composite structure integrates the advantages of rigid polycyclic cores (for stability) and flexible phenyl substituents (for charge transport), achieving high emission efficiency while maintaining structural coherence.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality modification by introducing nitrogen-containing substituents at specific positions on the phenyl groups. These localized nitrogen-containing regions provide specific functional properties (such as enhanced electron donation or hole transport) while the overall molecular framework maintains its structural integrity and stability.

Inventive Principle:

Principle #3Local quality

2Power

If conventional organic electroluminescence device materials are used, then the device structure is simple, but the driving voltage is high

Engineering Contradiction:

Improvedriving voltageVSAvoidmaterial structure complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent utilizes parameter changes by modifying the electronic properties of the organic compound through strategic substitution. The nitrogen-containing groups alter the HOMO-LUMO energy levels and charge carrier mobility parameters, enabling lower driving voltage operation while the fused polycyclic core maintains structural stability.

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If conventional organic electroluminescence device materials are used, then the material structure is simple, but the device lifespan is short

Engineering Contradiction:

Improvedevice lifespanVSAvoidmaterial structure complexity

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The fused polycyclic compound with multiple phenyl groups and nitrogen-containing substituents creates a composite molecular structure that combines the stability of aromatic polycyclic cores with the flexibility of substituent groups. This composite structure enhances molecular stability and resistance to degradation, thereby extending device lifespan.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Instead of simplifying the molecular structure to improve stability, the patent inverts the approach by introducing increased structural complexity through multiple phenyl groups and nitrogen-containing substituents. This inverted strategy demonstrates that controlled complexity can enhance stability by providing multiple stable aromatic rings and delocalized electron systems that resist degradation.

Inventive Principle:

Principle #13The other way round (Inversion)

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

This configuration achieves high emission efficiency, reduces driving voltage, and extends the device's lifespan by utilizing the fused polycyclic compound as a host material for thermally activated delayed fluorescence or phosphorescence.

Implementation Method 1

the emission layer may be to emit thermally activated delayed fluorescence or phosphorescence

Methodology Applied

Scientific EffectThermally activated delayed fluorescence: Fluorescence

Implementation Method 2

the emission layer may be to emit thermally activated delayed fluorescence or phosphorescence

Methodology Applied

Scientific EffectPhosphorescence: Phosphorescence

Data Source

PatentUS12219868B2Organic electroluminescence device

Publication Date: 2025.02.04 SAMSUNG DISPLAY CO LTD

AI summary

An organic electroluminescence device of the present disclosure includes a first electrode, a second electrode oppositely disposed to the first electrode, and multiple organic layers disposed between the first electrode and the second electrode, wherein at least one organic layer among the multiple organic layers includes a fused polycyclic compound represented by Formula 1, thereby showing improved emission efficiency.