Partially Reduced Graphene Oxide Anodes for Flexible OLED Displays

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Solution Overview

Problem

Conventional indium tin oxide (ITO) electrodes in organic electroluminescent devices are brittle, acid-sensitive, and scarce, limiting their use in flexible and transparent displays, and they do not effectively manage internal heat, which reduces the device's service life.

Innovation Solution

The use of partially reduced graphene oxides as electrode material, which offers excellent electrical and optical properties, high thermal conductivity, and is used to form an anode in organic electroluminescent devices, including a method of preparing graphene oxides and partially reducing them to create a conductive film for flexible displays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional ITO is used as electrode material, then electrical conductivity is achieved, but flexibility and mechanical strength deteriorate due to brittleness

Engineering Contradiction:

Improveelectrical conductivityVSAvoidmechanical flexibility

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent changes the material parameter from conventional ITO to partially reduced graphene oxide, which fundamentally alters the mechanical and electrical properties. The partial reduction process creates a material with both high electrical conductivity and exceptional mechanical flexibility, resolving the contradiction between electrical performance and mechanical strength

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material structure by combining graphene oxide with reduction agents (ascorbic acid, sodium borohydride, or hydrazine) to create partially reduced graphene oxide. This composite approach achieves a balance between electrical conductivity and mechanical flexibility that neither pure ITO nor fully reduced graphene oxide can provide alone

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If conventional ITO is used as electrode material, then transparent display is enabled, but manufacturing cost increases due to scarce resources

Engineering Contradiction:

Improvetransparent display capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive and scarce ITO with partially reduced graphene oxide, which can be synthesized from abundant carbon sources. The material maintains the necessary optical transparency for display applications while being significantly cheaper and more sustainable to produce at scale

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent changes the material composition parameter to use carbon-based graphene oxide instead of indium-based ITO, fundamentally altering the cost structure while maintaining optical transparency. The partial reduction process allows tuning of electrical properties to match display requirements

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If conventional ITO is used as electrode material, then device structure is simple, but heat management capability deteriorates reducing service life

Engineering Contradiction:

Improveelectrode structure simplicityVSAvoidheat management capability

Core Design Contradiction:

Device complexityVSTemperature

Solution Approach 1:

The patent changes the thermal conductivity parameter of the electrode material by using partially reduced graphene oxide, which has superior thermal transport properties compared to ITO. This enables effective heat dissipation while maintaining structural simplicity and electrical functionality

Inventive Principle:

Principle #35Parameter changes

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 partially reduced graphene oxide electrodes provide enhanced electrical and optical performance, high transmittance, and effective heat management, enabling the use of organic electroluminescent devices in flexible displays and extending their service life.

Implementation Method 1

the partially reduced graphene oxides have outstanding thermal conductivity, which is utilized to effectively conduct internal heat of the organic electroluminescent device

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

Organic light-emitting diode (OLED) is considered to be the most promising new generation of display technology due to its excellent characteristics such as self-illumination

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12258273B2Organic electroluminescent device, method of preparing conductive film material, and display panel

Publication Date: 2025.03.25 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

An organic electroluminescent device having an anode, wherein the anode comprises at least one first layer, the first layer being made of partially reduced graphene oxides.