Chrysene-Based Compound for OLED Electron Transport and Thermal Stability

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Solution Overview

Problem

Current organic light-emitting devices (OLEDs) face limitations in achieving high efficiency, luminance, and long lifetime due to challenges in electron transfer and thermal stability in their emission layers.

Innovation Solution

A chrysene-based compound with a benzocarbazole structure is introduced, facilitating electron migration and transfer, and offering high glass transition temperature, which is incorporated into the organic light-emitting device's electron transport region to enhance performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic light-emitting devices are used, then device structure is simple, but efficiency and luminance are limited

Engineering Contradiction:

ImproveefficiencyVSAvoiddevice structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent introduces a chrysene-based compound with specific molecular structure parameters (Formula 1) that changes the electronic and thermal properties of the emission layer, thereby improving efficiency and luminance while maintaining device structure simplicity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite material approach by combining chrysene core structure with various substituent groups (L11, R11, R12-R14) to create a multifunctional organic compound that simultaneously achieves high efficiency, luminance, and thermal stability

Inventive Principle:

Principle #40Composite materials

2Duration of action of stationary object

If conventional emission layers are used, then device manufacturing is easy, but lifetime is short

Engineering Contradiction:

ImprovelifetimeVSAvoidmanufacturing difficulty

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The chrysene-based compound with high glass transition temperature (Tg) changes the thermal stability parameter of the emission layer, extending device lifetime while maintaining ease of manufacture through standard OLED fabrication processes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs an organic compound that can be deposited using conventional vacuum deposition or solution processing methods, replacing complex inorganic materials with easier-to-manufacture organic materials that achieve comparable or superior performance

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Illumination intensity

If electron transport is not optimized, then device structure is simple, but luminance is low

Engineering Contradiction:

ImproveluminanceVSAvoidelectron transport structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The chrysene-based compound optimizes electron transport parameters (mobility, transfer rate) through its molecular structure, enhancing luminance without requiring complex multi-layer electron transport structures

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The chrysene-based compound acts as an intermediary material in the emission layer that facilitates electron transport between electrodes, improving luminance while maintaining simple device structure

Inventive Principle:

Principle #24Intermediary (Mediator)

4Productivity

If thermal stability is not sufficient, then device manufacturing is easy, but efficiency decreases

Engineering Contradiction:

ImproveefficiencyVSAvoidthermal stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent changes the thermal stability parameter by selecting substituents that increase glass transition temperature (Tg), thereby improving efficiency through better thermal management while maintaining material processability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The chrysene-based compound provides localized thermal stability at the emission layer level through its molecular structure, improving overall device efficiency without requiring thermal stabilization throughout the entire device structure

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 chrysene-based compound improves the efficiency, luminance, and extends the lifetime of the organic light-emitting device by facilitating electron transfer and providing thermal stability.

Implementation Method 1

facilitating electron migration and transfer

Methodology Applied

Scientific EffectElectron transfer: Conduction (electrical)

Implementation Method 2

offering high glass transition temperature, which is incorporated into the organic light-emitting device's electron transport region to enhance performance

Methodology Applied

Scientific EffectGlass transition: Phase Change

Data Source

PatentUS9601699B2Chrysene-based compound and organic light-emitting device including the same

Publication Date: 2017.03.21 SAMSUNG DISPLAY CO LTD

AI summary

A chrysene-based compound and an organic light-emitting device including the same, the chrysene-based compound being represented by Formula 1, below: