Mechanically Interlocked OLED Host-Emitter Compounds

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Solution Overview

Problem

There is a need for novel hosts and emitters for organic electroluminescent devices that can function effectively at room temperature and incorporate specific chemical groups such as naphthalene, triphenylene, carbazole, and dibenzothiophene to enhance performance in organic light emitting diodes (OLEDs).

Innovation Solution

The development of compounds comprising mechanically interlocked components A and B, where at least one of the components is capable of functioning as an emitter or host in an OLED, utilizing chemical groups like naphthalene, triphenylene, carbazole, indolocarbazole, triarylamine, dibenzothiophene, and their variants, to improve the efficiency and performance of OLEDs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional OLED materials are used, then the device structure is simple, but the internal quantum efficiency is limited and power efficiency is insufficient

Engineering Contradiction:

Improvepower efficiencyVSAvoidcompound structure complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The compound is divided into two mechanically interlocked components (A and B) that function separately as host and emitter, allowing optimization of each component's properties independently while achieving high internal quantum efficiency through their coordinated interaction in the OLED structure

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs a composite material system where component A (host) and component B (emitter) are mechanically interlocked without covalent bonds, creating a supramolecular composite that combines the advantages of both components to achieve enhanced power efficiency and internal quantum efficiency

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional emitters are used, then the manufacturing process is simple, but delayed fluorescence is not enabled and luminance efficiency is limited

Engineering Contradiction:

Improveluminance efficiencyVSAvoidemitter structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The emitter component is designed with specific chemical groups (naphthalene, triphenylene, carbazole, dibenzothiophene) that modify its photophysical parameters to enable delayed fluorescence, transforming the emission characteristics to achieve higher luminance efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The host component acts as an intermediary that facilitates the generation and emission of delayed fluorescence from the emitter component, mediating the energy transfer and enabling the luminescence mechanism that improves luminance efficiency

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

These compounds enhance the internal quantum efficiency of OLEDs by enabling delayed fluorescence and improving the interaction between host and emitter materials, leading to increased power and luminance efficiency.

Implementation Method 1

capable of functioning as an emitter in an organic light emitting device at room temperature... enabling delayed fluorescence

Methodology Applied

Scientific EffectDelayed fluorescence: Fluorescence

Implementation Method 2

improving the interaction between host and emitter materials, leading to increased power and luminance efficiency

Methodology Applied

Scientific EffectEnergy transfer:

Data Source

PatentUS10862046B2Organic electroluminescent materials and devices

Publication Date: 2020.12.08 UNIVERSAL DISPLAY CORP

AI summary

The present invention relates to mechanically linked emitter-emitter, host-host, and emitter-host materials. These materials may be useful in organic electroluminescence devices.