Polycyclic Compound Emission Layer for OLED Efficiency

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Solution Overview

Problem

Current organic electroluminescence devices face challenges in reducing driving voltage, increasing emission efficiency, and extending lifespan, particularly in the development of materials that can stably achieve these characteristics.

Innovation Solution

Incorporation of a polycyclic compound represented by specific formulas into the emission layer of an organic electroluminescence device, which includes a structure that enables delayed fluorescence and is designed to enhance efficiency and lifespan by restricting triplet-triplet and singlet-triplet annihilation through spin orbital interaction and molecular volume manipulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional materials are used in the emission layer, then the device structure is simple, but the emission efficiency is low and driving voltage remains high

Engineering Contradiction:

Improveemission efficiencyVSAvoidmolecular structure complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent modifies molecular parameters by introducing specific heteroatoms (N, O, S) at defined positions in the polycyclic framework and adjusting molecular volume through substituent groups, thereby optimizing emission efficiency and reducing roll-off without excessive structural complexity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates composite molecular structures by combining polycyclic cores with various functional groups and substituent patterns, achieving superior emission properties that neither simple structures nor random complex structures could provide alone

Inventive Principle:

Principle #40Composite materials

2Loss of energy

If the emission layer uses materials with high efficiency, then emission efficiency improves, but the lifespan of the device decreases

Engineering Contradiction:

Improveemission efficiencyVSAvoiddevice lifespan

Core Design Contradiction:

Loss of energyVSDuration of action of stationary object

Solution Approach 1:

The patent applies local quality by placing specific heteroatoms (N, O, S) at particular positions within the molecular structure and using position-specific substituent groups to locally control electronic properties, thereby achieving high efficiency while maintaining stability through targeted molecular design

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of accepting that high efficiency materials inherently have short lifespan, the patent inverts this relationship by designing polycyclic compounds with specific structural features that simultaneously achieve both high emission efficiency and extended device operational life through reduced degradation pathways

Inventive Principle:

Principle #13The other way round (Inversion)

3Use of energy by moving object

If driving voltage is reduced, then energy consumption decreases, but emission efficiency and lifespan cannot be maintained

Engineering Contradiction:

Improvedriving voltageVSAvoidemission efficiency stability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent optimizes multiple molecular parameters simultaneously (heteroatom composition, molecular volume, substituent patterns) to achieve low roll-off characteristics, enabling the device to maintain high emission efficiency at reduced driving voltages where conventional materials would fail

Inventive Principle:

Principle #35Parameter changes

4Loss of energy

If molecular volume is increased to restrict annihilation, then triplet-triplet and singlet-triplet annihilation are reduced, but device complexity increases

Engineering Contradiction:

Improveannihilation lossVSAvoidmolecular structure complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent precisely controls molecular volume through defined substituent groups and core structures, achieving sufficient volume to restrict annihilation while avoiding excessive complexity by maintaining a systematic polycyclic framework with controlled substitution patterns

Inventive Principle:

Principle #35Parameter changes

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 polycyclic compound in the emission layer results in improved efficiency and extended lifespan of organic electroluminescence devices by promoting delayed fluorescence and reducing roll-off, while maintaining high efficiency properties.

Implementation Method 1

the polycyclic compound of an embodiment may be used as a fluorescence emitting material or as a thermally activated delayed fluorescence (TADF) material

Methodology Applied

Scientific EffectDelayed fluorescence: Fluorescence

Implementation Method 2

designed to enhance efficiency and lifespan by restricting triplet-triplet and singlet-triplet annihilation through spin orbital interaction

Methodology Applied

Scientific EffectSpin orbital interaction:

Implementation Method 3

restricting triplet-triplet and singlet-triplet annihilation through spin orbital interaction and molecular volume manipulation

Methodology Applied

Scientific EffectTriplet-triplet annihilation restriction:

Implementation Method 4

restricting triplet-triplet and singlet-triplet annihilation through spin orbital interaction and molecular volume manipulation

Methodology Applied

Scientific EffectSinglet-triplet annihilation restriction:

Data Source

PatentUS20220246850A1Organic electroluminescence device and polycyclic compound for organic electroluminescence device

Publication Date: 2022.08.04 SAMSUNG DISPLAY CO LTD

AI summary

An organic electroluminescence device of an embodiment includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region. The emission layer includes a polycyclic compound represented by Formula 1, thereby showing high emission efficiency.