Nickel Oxide DMSO Hole Injection Layer for Display Devices

Solution Overview

Problem

Light-emitting elements with inorganic hole injection layers, such as those using nickel oxide nanoparticles in DMSO, face challenges in achieving high reliability and luminous efficiency, as previously disclosed solutions compromise on one or the other.

Innovation Solution

A light-emitting element structure incorporating a hole injection layer with nickel oxide nanoparticles chemically modified by dimethyl sulfoxide (DMSO) is used, combined with a multi-color emission approach involving red, green, and blue light-emitting elements, each with distinct emission peak wavelengths, to enhance both reliability and luminous efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If inorganic hole injection materials are used, then reliability is improved, but luminous efficiency deteriorates

Engineering Contradiction:

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent uses a composite hole injection layer combining inorganic nickel oxide nanoparticles with organic dimethyl sulfoxide (DMSO). This composite structure leverages the high reliability of inorganic materials while the organic DMSO component enhances hole injection capability and luminous efficiency, resolving the contradiction between reliability and efficiency

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the properties of nickel oxide nanoparticles by chemical modification with DMSO, changing the material parameters to achieve both high reliability and high luminous efficiency. The chemical modification alters the surface properties and charge transport characteristics of the inorganic nanoparticles

Inventive Principle:

Principle #35Parameter changes

2Loss of energy

If organic hole injection materials are used, then luminous efficiency is improved, but reliability deteriorates

Engineering Contradiction:

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent creates a hybrid composite where organic DMSO provides high hole injection capability and luminous efficiency, while inorganic nickel oxide nanoparticles provide structural stability and reliability, combining the advantages of both material types

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies different material properties to different aspects of hole injection: the organic DMSO component handles the charge transport and injection efficiency, while the inorganic nickel oxide provides structural integrity and reliability, allowing each material to optimize its local function

Inventive Principle:

Principle #3Local quality

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

This configuration significantly improves the reliability and luminous efficiency of the light-emitting elements, with improved drive voltage and external quantum efficiency, while maintaining the benefits of inorganic materials.

Implementation Method 1

a hole injection layer including a nickel oxide nanoparticle and dimethyl sulfoxide that chemically modifies the nickel oxide nanoparticle

Methodology Applied

Scientific EffectChemical modification: Chemical Bonding

Data Source

PatentUS20240357847A1Display device, and method for manufacturing display device

Publication Date: 2024.10.24

AI summary

A light-emitting element includes an anode, a cathode, a light-emitting layer, and a hole injection layer, and the hole injection layer includes a nickel oxide nanoparticle and dimethyl sulfoxide that chemically modifies the nickel oxide nanoparticle.