Amine-Based Compound for OLED Hole Transport

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Solution Overview

Problem

Current organic light-emitting devices (OLEDs) face challenges in achieving low driving voltage and high efficiency due to surplus electrons forming excitons and damaging the hole transport layer, leading to reduced device lifespan.

Innovation Solution

Incorporating an amine-based compound represented by Formulae 1-1 and 1-2, which includes at least one fluorine substituent, in the hole injection and transport layers to facilitate hole and electron acceptance, reducing surplus electrons, and minimizing exciton formation in the emission layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional hole transport materials are used in OLEDs, then device structure is simple, but surplus electrons form excitons and damage the hole transport layer, reducing device lifespan

Engineering Contradiction:

Improvedevice lifespanVSAvoidelectron-induced damage to hole transport layer

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a capping layer as an intermediary component between the hole transport layer and emission layer. This capping layer specifically designed with electron-blocking properties intercepts and blocks surplus electrons before they can reach and damage the hole transport layer, thereby resolving the harmful effect while preserving the simple device structure

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs composite material strategy by combining specific hole transport materials with a capping layer made of electron-blocking materials. This composite structure leverages the complementary properties of both materials - the hole transport capability of the hole transport layer and the electron-blocking capability of the capping layer - to simultaneously achieve high reliability and protection against electron-induced damage

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If driving voltage is reduced to improve efficiency, then energy consumption decreases, but charge transport performance may deteriorate

Engineering Contradiction:

Improveenergy consumptionVSAvoidcharge transport performance

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent optimizes the chemical composition and energy level parameters of the capping layer materials to create favorable energy gradients that facilitate efficient charge transport. By carefully selecting materials with appropriate LUMO and HOMO levels, the device achieves low driving voltage operation while maintaining excellent charge transport performance through enhanced charge injection and transport efficiency

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10937967B2Amine-based compound and organic light-emitting device including the amine-based compound

Publication Date: 2021.03.02 SAMSUNG DISPLAY CO LTD

AI summary

Provided is an amine-based compound represented by one of Formulae 1-1 and 1-2. An organic light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an organic layer disposed between the first electrode and the second electrode, where the organic layer includes an emission layer and at least one amine-based compound described above.