Quantum Dot Light-Emitting Element Nanoparticle Charge Transport Layer

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Solution Overview

Problem

Existing light-emitting elements have room for improvement in luminous efficiency.

Innovation Solution

A light-emitting element configuration that includes a first electrode, a second electrode, a light-emitting layer with a quantum dot layer, and a charge transport layer with a nanoparticle layer, where the average particle diameter of the nanoparticles is larger than that of the quantum dots, enhancing the interface non-uniformity and reducing charge transport paths, thereby improving carrier balance and external quantum efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the average particle diameter of nanoparticles is made larger than that of quantum dots, then carrier balance is improved and external quantum efficiency increases, but charge transport paths are reduced

Engineering Contradiction:

Improvecarrier balanceVSAvoidcharge transport paths

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the particle diameter parameter of nanoparticles in the charge transport layer, specifically making the average particle diameter larger than that of quantum dots. This parameter change modifies the interface non-uniformity and charge transport characteristics, improving carrier balance and external quantum efficiency while reducing excessive charge transport paths that cause efficiency losses

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the interface non-uniformity between charge transport layer and light-emitting layer is increased, then carrier balance is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvecarrier balanceVSAvoidinterface uniformity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent intentionally increases interface non-uniformity by using larger nanoparticle diameters, which creates a rougher interface morphology. This controlled non-uniformity improves carrier balance by reducing direct charge transport paths, while the nanoparticle size parameter provides a controllable way to achieve this effect

Inventive Principle:

Principle #35Parameter changes

3Productivity

If smaller nanoparticles are used in the charge transport layer, then charge transport paths increase, but luminous efficiency decreases

Engineering Contradiction:

Improvecharge transport pathsVSAvoidluminous efficiency

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent identifies that smaller nanoparticles create excessive charge transport paths between the charge transport layer and light-emitting layer, leading to energy loss and reduced luminous efficiency. By changing the nanoparticle size parameter to be larger than quantum dots, the patent reduces these harmful charge transport paths while maintaining sufficient charge transport functionality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harm of reduced charge transport paths into a benefit by showing that larger nanoparticles, while reducing charge transport paths, actually improve luminous efficiency by preventing excessive charge transport that causes energy loss and carrier imbalance

Inventive Principle:

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

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 configuration enhances luminous efficiency by improving carrier balance and external quantum efficiency through increased electron injection barrier and reduced charge transport paths, while also simplifying the manufacturing process and reducing the risk of peeling and cracking.

Implementation Method 1

enhancing the interface non-uniformity and reducing charge transport paths

Methodology Applied

Scientific EffectInterface non-uniformity:

Implementation Method 2

a light-emitting layer disposed between the first electrode and the second electrode, the light-emitting layer includes a quantum dot layer including a plurality of quantum dots

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

a charge transport layer including metal nanoparticles

Methodology Applied

Scientific EffectCharge transport: Conduction (electrical)

Data Source

PatentUS20240381683A1Light emitting element and display device

Publication Date: 2024.11.14 SHARP DISPLAY TECHNOLOGY CORP

AI summary

A light-emitting element includes a first electrode and a second electrode, a light-emitting layer disposed between the first electrode and the second electrode, and a charge function layer disposed between the light-emitting layer and the second electrode. The light-emitting layer includes a quantum dot layer including a plurality of quantum dots, and the charge function layer includes a nanoparticle layer including a plurality of nanoparticles. An average particle diameter of the plurality of nanoparticles is larger than an average particle diameter of the plurality of quantum dots.