Fused Polycyclic Compound for OLED Emission Efficiency

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Solution Overview

Problem

Current organic electroluminescence devices face challenges in reducing driving voltage and enhancing emission efficiency and lifetime, with existing materials not adequately addressing these requirements for stable performance.

Innovation Solution

A light emitting device incorporating a fused polycyclic compound with specific structural features, including a boron atom, nitrogen atom, and carbon atom fused aromatic rings, which acts as a dopant in the emission layer to improve emission efficiency and device lifetime by reducing intermolecular interactions and Dexter energy transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic electroluminescence materials are used, then the device can operate, but the emission efficiency and device lifetime are insufficient

Engineering Contradiction:

Improveemission efficiencyVSAvoiddevice lifetime

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies molecular parameters by introducing specific substituents (electron-donating groups like carbazole, triphenamine, and electron-withdrawing groups like fluorine atoms) to optimize the HOMO-LUMO energy gap and improve emission efficiency while enhancing device stability and lifetime through controlled molecular design

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material strategies by combining multiple functional groups and aromatic ring systems (benzene, naphthalene, anthracene, phenanthrene rings) within single molecular structures to achieve synergistic effects that simultaneously improve emission efficiency and device lifetime

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If driving voltage is reduced, then energy consumption decreases, but emission efficiency and lifetime requirements become harder to meet

Engineering Contradiction:

Improvedriving voltageVSAvoidemission efficiency

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent optimizes energy parameters by controlling HOMO-LUMO energy gaps through substituent selection, enabling lower driving voltages while maintaining high emission efficiency through enhanced electron-hole recombination in the emission layer

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If intermolecular interactions are increased, then material stability may improve, but Dexter energy transfer and intermolecular quenching increase reducing emission efficiency

Engineering Contradiction:

Improvematerial stabilityVSAvoidemission efficiency

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The patent applies local quality control by introducing bulky substituents at specific positions on aromatic rings to create localized steric hindrance that prevents excessive intermolecular interactions and quenching while maintaining overall material stability through the rigid fused ring core structure

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses dopants as intermediary substances in the emission layer to facilitate energy transfer while preventing direct harmful interactions between emitter molecules, thereby reducing Dexter energy transfer and intermolecular quenching

Inventive Principle:

Principle #24Intermediary (Mediator)

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 fused polycyclic compound enhances emission efficiency and extends the device's lifetime by suppressing intermolecular quenching, maintaining the boron atom's electron-deficient properties, and preventing structural deterioration, resulting in improved color purity and reduced triplet exciton concentration.

Implementation Method 1

The fused polycyclic compound enhances emission efficiency and extends the device's lifetime by suppressing intermolecular quenching

Methodology Applied

Scientific EffectIntermolecular quenching suppression:

Implementation Method 2

maintaining the boron atom's electron-deficient properties

Methodology Applied

Scientific EffectElectron-deficient properties:

Implementation Method 3

preventing structural deterioration

Methodology Applied

Scientific EffectStructural stability:

Implementation Method 4

reduced triplet exciton concentration

Methodology Applied

Scientific EffectTriplet exciton reduction:

Data Source

PatentUS20240179931A1Light emitting device and fused polycyclic compound for the light emitting device

Publication Date: 2024.05.30 SAMSUNG DISPLAY CO LTD

AI summary

A light emitting device may include a first electrode, a second electrode on the first electrode, and an emission layer between the first electrode and the second electrode, wherein the emission layer includes a first compound represented by Formula 1.