Hole Transport Compound for Low-Voltage OLED Efficiency

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Solution Overview

Problem

Current organic light-emitting devices face challenges in achieving low driving voltage, high efficiency, and long lifespan due to limitations in hole mobility and material stability in their light-emitting layers.

Innovation Solution

A novel compound with a specific chemical structure is introduced, which is used in the hole transport layer or auxiliary hole transport layer of organic light-emitting devices, enhancing hole mobility and stability, thereby reducing driving voltage and improving efficiency and lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If conventional materials are used in the hole transport layer, then the device structure is simple, but the hole mobility is low and the driving voltage is high

Engineering Contradiction:

Improvehole mobilityVSAvoiddriving voltage

Core Design Contradiction:

SpeedVSUse of energy by stationary object

Solution Approach 1:

The patent introduces a novel compound with specific molecular structure parameters (Formula 1 with defined substituents and groups) to change the electrical parameters of the hole transport layer, achieving higher hole mobility and lower driving voltage through material parameter optimization

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional materials are used in the hole transport layer, then the manufacturing process is simple, but the device efficiency is low and lifespan is short

Engineering Contradiction:

Improvedevice efficiencyVSAvoidmaterial stability

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent employs a composite material approach by designing a novel compound that integrates multiple functional groups (Formula 1) to simultaneously achieve high device efficiency and long lifespan, resolving the contradiction between performance and material stability

Inventive Principle:

Principle #40Composite materials

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 novel compound results in organic light-emitting devices with lower drive voltage, improved efficiency, and extended lifespan, as demonstrated by comparative measurements with conventional materials.

Implementation Method 1

when charges are injected into a light-emitting layer formed between a first electrode and a second electrode to form paired electrons and holes to form excitons

Methodology Applied

Scientific EffectCharge transport: Conduction (electrical)

Implementation Method 2

a novel compound of a novel structure that is stable materially and has high hole mobility

Methodology Applied

Scientific EffectHole mobility enhancement: Conduction (electrical)

Data Source

PatentUS11844270B2Compound and organic light emitting device including the same

Publication Date: 2023.12.12 LG DISPLAY CO LTD

AI summary

Disclosed is a novel compound and an organic light-emitting device. The novel compound is represented by the following Chemical Formula 1, and when the novel compound is used as a material for a hole transport layer of an organic light emitting device, the novel compound allows the device to have lowered drive voltage, and improved efficiency and lifespan characteristics.