Bis-Indole Host Materials for OLED Charge Transport

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Solution Overview

Problem

There is a need for novel hosts that improve the performance of organic electroluminescent devices (OLEDs), as existing materials do not adequately enhance efficiency and performance.

Innovation Solution

The development of a compound with a specific structure, Formula I, which can be used as a host in OLEDs, incorporating aryl, substituted aryl, heteroaryl, and substituted heteroaryl groups, along with various substitution options and linkages, to improve charge transport and emission properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic materials are used in OLEDs, then the device structure is simple and fabrication is easier, but the efficiency and performance are insufficient

Engineering Contradiction:

Improvedevice efficiencyVSAvoidmaterial structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent modifies the molecular structure parameters of organic host materials by introducing specific substituents (Ar1, Ar2, R1-R4 groups) and linkages (L) to optimize charge transport properties and enhance device efficiency while maintaining reasonable structural complexity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite organic host materials combining multiple functional groups and substituents in a single molecular structure (Formula I) to achieve synergistic effects that improve both charge transport and device performance

Inventive Principle:

Principle #40Composite materials

2Productivity

If existing host materials are used, then the device operation voltage remains at conventional levels, but the efficiency is not sufficiently enhanced

Engineering Contradiction:

Improvedevice efficiencyVSAvoidoperation voltage

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent changes the electronic and structural parameters of the host material through specific molecular design (Formula I) to improve charge transport efficiency, which simultaneously enhances device efficiency and reduces operation voltage requirements

Inventive Principle:

Principle #35Parameter changes

3Reliability

If organic materials with extended conjugation are used, then charge transport properties are enhanced, but the molecular structure becomes more complex

Engineering Contradiction:

Improvecharge transport propertiesVSAvoidmolecular structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent optimizes the conjugation length and molecular parameters within a controlled range to achieve improved charge transport properties while preventing excessive molecular complexity through systematic structural design

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 compound as a host in OLEDs results in lower operation voltage and higher efficiency, attributed to enhanced charge-transport properties and extended conjugation, leading to improved device performance.

Implementation Method 1

enhanced charge-transport properties

Methodology Applied

Scientific EffectCharge transport: Conduction (electrical)

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

PatentUS10177318B2Organic electroluminescent materials and devices

Publication Date: 2019.01.08 UNIVERSAL DISPLAY CORP

AI summary

Bis-Indole compounds are disclosed and used as hosts to improve the organic electroluminescent devices (OLEDs) performance.