Fused Tetraphenylene Compounds for OLED Delayed Fluorescence

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Solution Overview

Problem

There is a need for novel compounds that can be used as charge transporters, hosts, or emitters in organic light emitting diodes (OLEDs) to improve their performance and efficiency.

Innovation Solution

A compound with a specific structure, Formula I, is provided, which can be used in the organic layer of OLEDs, allowing for the emission of blue or yellow light through a delayed fluorescence process, and can be incorporated into various consumer products such as displays and lighting panels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic materials are used in OLEDs, then the devices can be fabricated with cost advantages and flexibility, but the performance and efficiency are insufficient compared to inorganic devices

Engineering Contradiction:

Improveperformance and efficiencyVSAvoidcost advantage and flexibility

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs composite organic materials comprising host molecules and guest emitter molecules to create OLEDs that combine the advantages of organic materials (flexibility, low cost) with enhanced performance. The composite system allows energy transfer from host to guest, achieving high efficiency emission while maintaining organic material benefits

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies molecular parameters of organic compounds including introducing deuterium atoms, adjusting substituent groups, and optimizing molecular structure to enhance radiative decay rates and photostability. These parameter changes improve emission efficiency and device performance while retaining organic material characteristics

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If phosphorescent emissive molecules are used to achieve saturated colors in full color display, then color saturation is improved, but device complexity and material requirements increase

Engineering Contradiction:

Improvecolor saturationVSAvoidmaterial requirements

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent uses host molecules as intermediaries that absorb energy and transfer it to phosphorescent guest molecules. This intermediary system enables saturated color emission from phosphorescent materials while the host material provides structural support and facilitates energy transfer, reducing direct complexity requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent designs phosphorescent emissive molecules that can serve multiple functions: achieving saturated red, green, or blue emission depending on the specific compound used, while also providing host-guest energy transfer capabilities and maintaining device stability. This multi-functionality reduces the need for separate specialized materials

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Illumination intensity

If white OLED is designed using absorption filters to produce saturated colors, then color output is achieved, but light intensity and efficiency are reduced due to filtering losses

Engineering Contradiction:

Improvecolor outputVSAvoidfiltering losses

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

Instead of using a white light source with absorption filters to create colors, the patent inverts the approach by using separate phosphorescent emissive molecules that directly emit saturated red, green, and blue light. This eliminates the need for absorption filters and the associated energy losses, achieving color output through direct emission

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extracts the color generation function from a white backlight system and implements it directly through phosphorescent emissive molecules in the organic layer. By removing the white backlight and absorption filter components, the system achieves saturated colors with higher efficiency and reduced energy loss

Inventive Principle:

Principle #2Taking out (Extraction)

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 compound enhances the luminescent radiation emission of OLEDs at room temperature, offering improved performance and efficiency in organic light emitting devices, including consumer products like flat panel displays and lighting panels.

Implementation Method 1

allowing for the emission of blue or yellow light through a delayed fluorescence process

Methodology Applied

Scientific EffectDelayed fluorescence: Fluorescence

Implementation Method 2

OLEDs make use of thin organic films that emit light when voltage is applied across the device

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10608185B2Organic electroluminescent materials and devices

Publication Date: 2020.03.31 UNIVERSAL DISPLAY CORP

AI summary

The present invention includes fused tetraphenylene compounds that may be used as charge transporters, hosts or emitters in OLEDs.