Soluble Graphene Quantum Dots for Efficient Long-Life OLED Emission

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing organic light-emitting devices face challenges in achieving high efficiency and long lifetime due to limitations in light-emitting materials.

Innovation Solution

Incorporation of soluble graphene quantum dots with an anthracenyl N-alkyl maleimide functional group at the edge, which are soluble in solvents and can be used as a host in the organic layer, enhancing emission characteristics and lifetime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic light-emitting materials are used, then the device can operate, but the efficiency and lifetime are limited

Engineering Contradiction:

ImprovelifetimeVSAvoidefficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent uses graphene quantum dots as a composite material in the organic light-emitting device. Graphene quantum dots combine the high efficiency of carbon-based materials with quantum confinement effects, achieving both high efficiency and long lifetime simultaneously. The quantum dots serve as both the light-emitting material and the host material, eliminating the need for separate components and improving overall device performance.

Inventive Principle:

Principle #40Composite materials

2Reliability

If graphene quantum dots are used as light-emitting material, then efficiency and lifetime are improved, but solubility and processability become challenging

Engineering Contradiction:

ImprovelifetimeVSAvoidsolubility

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent modifies the surface properties of graphene quantum dots by introducing functional groups (carboxyl, hydroxyl, or amine groups) at the edge sites. This chemical parameter change enhances solubility in common organic solvents while preserving the core quantum confinement effects that provide high efficiency and long lifetime. The functional groups enable better integration with conventional organic light-emitting device materials.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If graphene quantum dots with functional groups are used, then solubility is improved, but the complexity of synthesis increases

Engineering Contradiction:

ImprovesolubilityVSAvoidsynthesis complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent divides the graphene quantum dot into distinct functional regions: a core graphene structure providing quantum confinement and edge sites with functional groups providing solubility. This segmentation allows independent optimization of each region - the core maintains high efficiency while the edge groups ensure solubility. The modular approach simplifies synthesis by allowing separate control of core formation and surface functionalization.

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 soluble graphene quantum dots enable high efficiency and long lifetime in organic light-emitting devices by providing excellent emission characteristics across various wavelength bands, including R, G, and B regions.

Implementation Method 1

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS12466995B2Soluble graphene quantum dots and light-emitting device using the same

Publication Date: 2025.11.11 SAMSUNG ELECTRONICS CO LTD

AI summary

Provided are soluble graphene quantum dots and light-emitting devices including the same. The soluble graphene quantum dot has an anthracenyl N-alkyl maleimide functional group at an edge thereof, thereby exhibiting improved solubility and/or improved emission characteristics.