Condensed Cyclic Compound for OLED Charge Transport and Durability

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Solution Overview

Problem

Current organic light-emitting devices face limitations in achieving high durability, low driving voltage, and high efficiency due to challenges in charge transport and intermolecular packing of condensed cyclic compounds.

Innovation Solution

A condensed cyclic compound represented by Formula 1 is introduced, featuring a pi-conjugated system with reduced intramolecular steric hindrance, enhancing intermolecular packing and charge transport ability, and allowing for favorable coordinate bonding with n-type dopants, thereby improving the performance of organic light-emitting devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic light-emitting device materials are used, then device structure is simple, but durability is low and efficiency is poor

Engineering Contradiction:

ImprovedurabilityVSAvoiddevice structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent modifies molecular parameters of the condensed cyclic compound by introducing specific substituent groups (Formula 2) at defined positions (R1-R7) to optimize glass transition temperature and charge transport properties, thereby improving durability without fundamentally changing the device structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite material strategy by combining the condensed cyclic compound (Formula 1) with n-type dopants to create a composite emission layer or electron transport layer, achieving enhanced durability and efficiency while maintaining relatively simple device architecture

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional materials are used, then manufacturing process is simple, but charge transport ability is insufficient

Engineering Contradiction:

Improvecharge transport abilityVSAvoidmanufacturing process

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent changes molecular parameters by introducing electron-withdrawing or electron-donating groups (Formula 2) to the condensed cyclic core (Formula 1) to tune charge transport properties and HOMO/LUMO energy levels, improving charge transport ability while maintaining compatibility with existing manufacturing processes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality principle by placing specific functional groups (Formula 2) at particular positions (R1-R7) on the condensed cyclic compound to enhance charge transport in specific regions of the molecule, optimizing overall charge transport ability without complicating the manufacturing process

Inventive Principle:

Principle #3Local quality

3Stability of the object's composition

If conventional compounds are used, then intramolecular steric hindrance is high, but intermolecular packing is poor

Engineering Contradiction:

Improveintermolecular packingVSAvoidmolecular structure

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent introduces asymmetric substituent groups (Formula 2) at specific positions on the condensed cyclic compound to reduce intramolecular steric hindrance and create favorable molecular shapes for efficient intermolecular packing, improving material stability without excessive molecular complexity

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent modifies molecular parameters by selecting specific substituent types and positions in Formula 2 to optimize the balance between reducing intramolecular steric hindrance and enhancing intermolecular packing efficiency, achieving improved material stability

Inventive Principle:

Principle #35Parameter changes

4Productivity

If conventional materials are used, then driving voltage is high, but efficiency is low

Engineering Contradiction:

ImproveefficiencyVSAvoiddriving voltage

Core Design Contradiction:

ProductivityVSPower

Solution Approach 1:

The patent changes energy level parameters (HOMO/LUMO) of the condensed cyclic compound by introducing specific substituent groups (Formula 2) to optimize electron injection and transport, achieving high efficiency at low driving voltage through molecular parameter optimization

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates composite materials by combining the condensed cyclic compound with n-type dopants to improve electron transport efficiency and reduce driving voltage, achieving high productivity without excessive power consumption

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 condensed cyclic compound results in high glass transition temperature, melting point, and electron mobility, leading to improved durability, low driving voltage, and high efficiency in organic light-emitting devices.

Implementation Method 1

allowing for favorable coordinate bonding with n-type dopants

Methodology Applied

Scientific EffectCoordinate bonding: Chemical Bonding

Implementation Method 2

featuring a pi-conjugated system with reduced intramolecular steric hindrance, enhancing intermolecular packing

Methodology Applied

Scientific EffectPi-conjugation:

Data Source

PatentUS11588111B2Condensed-cyclic compound and organic light-emitting device including the same

Publication Date: 2023.02.21 SAMSUNG DISPLAY CO LTD

AI summary

A condensed cyclic compound and an organic light-emitting device, the compound being represented by Formula 1: