Nanoparticle Charge Function Layer Reduces Drive Voltage

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Solution Overview

Problem

Known light-emitting elements face the challenge of high drive voltage, which affects their efficiency and performance.

Innovation Solution

A light-emitting element configuration that includes an anode, a cathode, a light-emitting layer, and a charge function layer with nanoparticles and organic molecules. The charge function layer incorporates nanoparticles with metal atoms and organic molecules having specific functional groups for improved hole transport, reducing the drive voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If nanoparticles are used in the charge function layer, then hole transport property is improved, but drive voltage becomes high

Engineering Contradiction:

Improvehole transport propertyVSAvoiddrive voltage

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent introduces an organic molecule as an intermediary between the nanoparticle and the hole transport layer. This organic molecule has a functional group that bonds to the nanoparticle surface and another functional group that facilitates hole transport, thereby mediating the interaction between the nanoparticle and the charge transport process, which reduces the drive voltage while maintaining hole transport efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the surface properties of the nanoparticle by bonding organic molecules to it, changing the surface energy and chemical composition parameters. This parameter change improves the compatibility and interaction between the nanoparticle and the surrounding charge transport materials, leading to reduced drive voltage and improved device performance

Inventive Principle:

Principle #35Parameter changes

2Reliability

If nanoparticles are used in the charge function layer, then charge transport function is enhanced, but surface defects increase

Engineering Contradiction:

Improvecharge transport functionVSAvoidsurface defects

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful surface defects of nanoparticles into beneficial features by bonding organic molecules to the nanoparticle surface. The functional groups of these organic molecules not only passivate the surface defects but also provide additional hole transport capability, transforming the harmful surface properties into beneficial charge transport enhancement

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent creates a composite structure by combining nanoparticles with organic molecules in the charge function layer. This composite material approach leverages the high surface area and charge transport capability of nanoparticles while using the organic molecules to passivate surface defects and improve overall charge transport efficiency

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 proposed configuration reduces the drive voltage of the light-emitting element, enhancing its efficiency and performance by improving hole transport and reducing surface defects on the nanoparticles.

Implementation Method 1

an organic molecule having a first functional group capable of bonding to the nanoparticle

Methodology Applied

Scientific EffectChemical bonding: Chemical Bonding

Implementation Method 2

a second functional group having a hole transport property

Methodology Applied

Scientific EffectHole transport: Holes

Data Source

PatentUS20250185452A1Light emitting element, display device, and nanoparticle dispersion liquid

Publication Date: 2025.06.05 SHARP DISPLAY TECHNOLOGY CORP

AI summary

A light-emitting element includes an anode and a cathode, a light-emitting layer positioned between the anode and the cathode, and a charge function layer positioned between the anode and the light-emitting layer and including a nanoparticle including a metal atom, in which the charge function layer includes an organic molecule including a first functional group capable of bonding to the nanoparticle, a second functional group having a hole transport property, and a hydrocarbon group having 1 to 4 carbon atoms.