Amine-Containing Compound for OLED Hole Transport and Lifespan

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Solution Overview

Problem

Organic light-emitting devices face limitations in achieving high luminance, low driving voltage, and long lifespan due to challenges in hole transport characteristics and material degradation during deposition processes.

Innovation Solution

An amine-containing compound represented by Formula 1 is integrated into the light-emitting device, specifically in the hole transport region and as a capping layer, to enhance hole transport characteristics and reduce material degradation, resulting in improved luminance efficiency and extended lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If conventional hole transport materials are used, then device structure is simple, but hole transport characteristics are insufficient leading to high driving voltage and low luminance

Engineering Contradiction:

Improvedriving voltageVSAvoidcompound structure complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent employs composite amine-containing compounds that integrate multiple functional groups (carbazole, triphenylamine, fluorene) within a single molecular structure. This composite approach enables the material to simultaneously provide excellent hole transport characteristics, appropriate energy levels, and thermal stability, thereby reducing driving voltage without requiring multiple separate material layers

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent systematically varies structural parameters of the amine-containing compounds, including substituent types (R1-R6 groups), ring structures (Ar1-Ar6), and molecular configurations (a1-a6 positions) to optimize hole mobility and energy level alignment. These parameter adjustments enable fine-tuning of electrical properties to achieve low driving voltage operation

Inventive Principle:

Principle #35Parameter changes

2Productivity

If deposition processes are used to manufacture devices, then production efficiency is improved, but material degradation occurs reducing lifespan

Engineering Contradiction:

Improvedevice manufacturing efficiencyVSAvoiddevice lifespan

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent employs deposition processes conducted in controlled inert or vacuum environments that prevent oxidative degradation of the amine-containing compounds during manufacturing. This allows efficient device production while preserving material integrity and extending operational lifespan

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The patent uses small molecular weight amine-containing compounds that can be deposited as thin films in controlled processes. These compounds are designed to be stable during the deposition process but form protective, stable layers in the final device structure, effectively sacrificing the deposition process conditions to protect the final product

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If hole transport characteristics are optimized, then luminance efficiency increases, but material stability during deposition deteriorates

Engineering Contradiction:

Improveluminance efficiencyVSAvoidmaterial stability during deposition

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent designs composite molecules combining hole-transporting moieties (carbazole, triphenylamine) with structurally stable frameworks (fluorene, indene). This composite structure provides both high hole mobility for efficient luminance and thermal/chemical stability to withstand deposition processes

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent introduces localized stable structural units (rigid aromatic rings, sterically hindered groups) at specific positions within the amine-containing compound molecules. These local stable regions act as anchors that prevent molecular degradation during deposition while the overall molecular structure maintains excellent hole transport properties

Inventive Principle:

Principle #3Local quality

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 amine-containing compound enables a light-emitting device with low driving voltage, high luminance, and long lifespan by optimizing hole transport and reducing material degradation, thereby improving overall device performance.

Implementation Method 1

Holes injected from the first electrode may move to the emission layer through the hole transport region

Methodology Applied

Scientific EffectHole transport: Conduction (electrical)

Implementation Method 2

Methodology Applied

Scientific EffectMaterial degradation resistance:

Implementation Method 3

Carriers such as the holes and the electrons may combine in the emission layer. The carriers may combine to generate excitons. These excitons transition from an excited state to a ground state to generate light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20230389417A1Amine-containing compound, light-emitting device including the same, electronic device including the light-emitting device and electronic apparatus including the electronic device

Publication Date: 2023.11.30 SAMSUNG DISPLAY CO LTD

AI summary

A light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an emission layer, and an amine-containing compound represented by Formula 1, which is defined in the specification.