Semiconductor Nanoparticle-Ligand Composite for Resin Compatibility

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Solution Overview

Problem

Liquid crystal display devices require a separate backlight due to lack of self-luminescence and struggle with achieving perfect black color and wide color reproducibility, while quantum dots face compatibility issues with organic resins in patterning processes, limiting their color characteristics.

Innovation Solution

A semiconductor nanoparticle-ligand composite with low viscosity and excellent compatibility is developed, incorporating a specific ligand structure for improved compatibility with organic resins, used in a photosensitive resin composition to form an optical film with high quantum efficiency, which is then integrated into electroluminescent diodes and electronic devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If quantum dots are used to convert blue light into different colors, then color characteristics are improved, but compatibility with organic resins deteriorates, making patterning difficult

Engineering Contradiction:

Improvecolor characteristicsVSAvoidcompatibility with organic resins

Core Design Contradiction:

Illumination intensityVSAdaptability or versatility

Solution Approach 1:

A ligand exchange process is employed where original ligands on quantum dot surfaces are replaced with new ligands that have improved compatibility with organic resins. The ligand acts as an intermediary that maintains quantum dot functionality while enabling better integration with the resin matrix, thus resolving the compatibility issue without sacrificing color characteristics

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The chemical composition and structural parameters of the ligand are modified to achieve optimal compatibility. By changing ligand parameters such as molecular weight, functional groups, and chain length, the quantum dots achieve improved miscibility with organic resins while maintaining their optoelectronic properties

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If quantum dot content is increased to improve color characteristics, then display performance is enhanced, but patterning processability deteriorates due to low compatibility

Engineering Contradiction:

Improvecolor characteristicsVSAvoidpatterning processability

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The ligand serves as a mediator that enables high quantum dot content incorporation into the organic resin system. By improving interfacial compatibility through ligand engineering, the system can accommodate higher quantum dot concentrations without compromising patterning processability, thus enabling both enhanced color characteristics and manufacturability

Inventive Principle:

Principle #24Intermediary (Mediator)

3Use of energy by moving object

If quantum dots are incorporated into organic resin for patterning, then self-luminescence is achieved, but quantum efficiency deteriorates due to compatibility issues

Engineering Contradiction:

Improveself-luminescenceVSAvoidquantum efficiency

Core Design Contradiction:

Use of energy by moving objectVSLoss of energy

Solution Approach 1:

The ligand acts as an energy transfer intermediary that facilitates efficient energy transfer from the organic resin to the quantum dots. By optimizing ligand structure and composition, non-radiative energy losses are minimized, enabling high quantum efficiency while maintaining self-luminescence capability in the patterned structure

Inventive Principle:

Principle #24Intermediary (Mediator)

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 semiconductor nanoparticle-ligand composite enhances the quantum efficiency of optical films and electroluminescent diodes, enabling better color characteristics and display performance by improving the compatibility and patterning processability of quantum dots.

Implementation Method 1

X is a functional group that binds to the surface of semiconductor nanoparticles, —S(H) or —P═O(OH)2 or —COOH

Methodology Applied

Scientific EffectSurface binding: Chemical Bonding

Implementation Method 2

photosensitive resin composition, optical film having excellent quantum efficiency

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS20230100943A1Semiconductor nanoparticle-ligand composite, manufacturing method of thereof, photosensitive resin composition, optical film, electroluminescent diode and electronic device

Publication Date: 2023.03.30 DUK SAN NEOLUX

AI summary

Provided are a photosensitive resin composition having low viscosity and high compatibility prepared by providing a semiconductor nanoparticle-ligand composite comprising a ligand represented by Formula 1, an optical film having uniform and remarkably excellent quantum efficiency using the photosensitive resin composition, and an electroluminescent diode comprising the optical film and an electronic device comprising an electroluminescent diode.