Arylamine Compound for Organic EL Charge Transport

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Solution Overview

Problem

Existing organic electroluminescence (EL) devices face limitations in charge transport capability and electron resistance, leading to inefficiencies and short device lifespan.

Innovation Solution

An arylamine compound with a dibenzopiperidine derivative substituent and dibenzofuranyl or dibenzothiophenyl group is introduced to enhance charge transport and electron resistance, forming a high-efficiency and long-life organic EL device by suppressing crystallization in the hole transport layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional hole transport materials are used in organic EL devices, then device structure is simple, but charge transport capability is insufficient and electron resistance is high

Engineering Contradiction:

Improvecharge transport capabilityVSAvoidmolecular structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs composite molecular structures combining dibenzopiperidine derivative cores with dibenzofuranyl or dibenzothiophenyl groups. This composite approach integrates multiple functional moieties into a single molecule, achieving enhanced charge transport capability through synergistic effects while maintaining reasonable structural complexity

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent systematically varies molecular parameters including substituent types (dibenzofuranyl vs dibenzothiophenyl), substitution positions (2-position vs 7-position), and side chain structures to optimize charge transport properties. These parameter changes enable fine-tuning of HOMO/LUMO energy levels, mobility, and electron resistance without fundamentally altering the core molecular architecture

Inventive Principle:

Principle #35Parameter changes

2Duration of action of stationary object

If conventional hole transport materials are used, then manufacturing is straightforward, but device lifespan is short due to carrier imbalance and material degradation

Engineering Contradiction:

Improvedevice lifespanVSAvoidmaterial synthesis complexity

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The patent introduces specific functional groups (dibenzofuranyl or dibenzothiophenyl) at predetermined positions on the dibenzopiperidine core to create localized regions with enhanced electron resistance properties. This local quality enhancement protects against electron-induced degradation at critical sites while maintaining overall molecular stability and manufacturability

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs substitutable side chain groups (alkyl, alkoxy, aryl) that can be easily modified through standard organic synthesis techniques. These disposable-like modular components allow optimization of device lifespan through systematic molecular variation without requiring complex synthesis routes, maintaining ease of manufacture

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If existing hole transport materials are used, then device operation is simple, but efficiency is low due to poor charge transport and high electron resistance

Engineering Contradiction:

Improvedevice efficiencyVSAvoidmolecular structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent divides the hole transport material into distinct functional segments: a dibenzopiperidine derivative core for hole transport, and dibenzofuranyl or dibenzothiophenyl groups for electron resistance management. This segmentation allows each segment to perform its specific function optimally, achieving high overall device efficiency through coordinated action of specialized subunits

Inventive Principle:

Principle #1Segmentation

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 arylamine compound improves charge transport and electron resistance, resulting in organic EL devices with higher efficiency and extended lifespan by maintaining stable operation and suppressing carrier imbalance and material degradation.

Implementation Method 1

the charge transport capability may be improved, and thus a high efficiency and long-life organic EL device may be realized

Methodology Applied

Scientific EffectCharge transport: Conduction (electrical)

Implementation Method 2

holes injected from an anode and electrons injected from a cathode are recombined in a light-emitting layer to thus emit a light from a light-emitting material

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS9196841B2Arylamine compound and electroluminescence device using the same

Publication Date: 2015.11.24 SAMSUNG DISPLAY CO LTD

AI summary

An arylamine compound is represented by Formula 1where R, X, Y, and n are further defined.