Deuterated Amine Compound for OLED Efficiency and Lifespan

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Solution Overview

Problem

Current organic light-emitting devices (OLEDs) face challenges in achieving optimal performance due to limitations in the materials used for the amine compound, which affect the device's efficiency, luminance, and lifespan.

Innovation Solution

An amine compound represented by Formula 1 is introduced, featuring a specific structure that includes phenylene groups as linkers and deuterium atoms, enhancing thermal stability, synthesis yield, and intermolecular interactions, and is used in the organic light-emitting device's hole transport region or emission layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional amine compounds are used in OLEDs, then the device can be manufactured with standard materials, but the efficiency, luminance, and lifespan of the device are suboptimal

Engineering Contradiction:

Improvedevice lifespanVSAvoidmaterial performance range

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent introduces deuterium atoms at specific positions in the amine compound structure and modifies molecular parameters such as glass transition temperature and energy levels. These parameter changes result in improved device lifespan, efficiency, and luminance while maintaining manufacturability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates composite amine compounds combining specific structural elements (phenylene linkers, deuterium atoms, electron-donating groups) to achieve superior performance characteristics that neither conventional materials nor simple modifications could provide alone

Inventive Principle:

Principle #40Composite materials

2Power

If amine compounds with complex structures are used to improve performance, then efficiency and luminance increase, but the synthesis yield decreases and manufacturing becomes more difficult

Engineering Contradiction:

Improvedevice efficiencyVSAvoidsynthesis yield

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The patent applies deuterium substitution and specific structural modifications only at critical positions within the amine compound molecule rather than throughout the entire structure. This localized approach maintains synthesis feasibility while achieving the desired performance improvements in efficiency and luminance

Inventive Principle:

Principle #3Local quality

3Stability of the object's composition

If amine compounds with high glass transition temperature are used to improve thermal stability, then device lifespan increases, but the driving voltage increases

Engineering Contradiction:

Improvethermal stabilityVSAvoiddriving voltage

Core Design Contradiction:

Stability of the object's compositionVSUse of energy by moving object

Solution Approach 1:

The patent carefully balances molecular parameters including glass transition temperature, HOMO-LUMO energy gap, and thermal stability. By optimizing these parameters within specific ranges rather than maximizing them, the compound achieves improved thermal stability and lifespan while maintaining acceptable driving voltage levels

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20210384431A1Amine compound and organic light-emitting device including the same

Publication Date: 2021.12.09 SAMSUNG DISPLAY CO LTD

AI summary

Provided are an amine compound represented by Formula 1 and an organic light-emitting device including the same. The organic light-emitting devices includes: a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode and including an emission layer; and at least one amine compound represented by Formula 1.