Nanoparticle Electroluminescent Diodes for Luminous Efficiency

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Solution Overview

Problem

Electroluminescent diodes face challenges with high driving current and voltage requirements, leading to unstable operation and reduced lifetime due to increased internal resistance during emission, which affects luminous efficiency and stability.

Innovation Solution

Incorporating nanoparticles in the light emitting structure layer of electroluminescent diodes to enhance luminous efficiency by promoting radiation processes through resonance with plasmons, and using an energy transfer layer to reduce turn-on voltage, thereby reducing the required driving current and voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If electroluminescent diodes operate at high driving current and voltage to achieve required luminance, then brightness is improved, but internal resistance increases causing unstable operation and reduced lifetime

Engineering Contradiction:

ImproveluminanceVSAvoidoperational stability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent changes the optical parameters of the electroluminescent diode by introducing nanoparticles with specific plasmon resonance characteristics. These nanoparticles modify the radiation process through resonance coupling, enabling enhanced luminous efficiency at reduced driving currents and voltages, thereby stabilizing operation while maintaining required luminance levels

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite light emitting structures combining organic electroluminescent materials with inorganic nanoparticles (such as metal or metal oxide nanoparticles). This composite structure leverages the plasmonic resonance of nanoparticles to enhance radiative recombination, achieving improved luminous efficiency without requiring high driving currents that would otherwise cause instability

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If electroluminescent diodes operate at high driving current and voltage to achieve required luminance, then brightness is improved, but luminous efficiency decreases due to increased internal resistance

Engineering Contradiction:

ImproveluminanceVSAvoidluminous efficiency

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent modifies the radiation parameters of the electroluminescent diode by introducing nanoparticles with tailored plasmon resonance frequencies. This changes the energy conversion parameters, enabling more efficient conversion of electrical energy to light at reduced driving currents, thereby improving luminous efficiency while maintaining required luminance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The nanoparticles act as an intermediary mechanism between the electroluminescent material and the emitted light. Through plasmon resonance coupling, the nanoparticles facilitate more efficient energy transfer and enhance the radiation process, improving luminous efficiency without requiring increased driving current

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If conventional electroluminescent diode structure is used, then device simplicity is maintained, but turn-on voltage is high requiring large driving current

Engineering Contradiction:

Improvestructure simplicityVSAvoidturn-on voltage

Core Design Contradiction:

Device complexityVSPower

Solution Approach 1:

The patent introduces localized plasmon resonance effects by incorporating nanoparticles at specific locations within the light emitting structure. This local modification of electromagnetic field distribution enables reduced turn-on voltage without requiring fundamental changes to the overall device structure, maintaining simplicity while lowering power requirements

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the electrical parameters of the electroluminescent diode by introducing nanoparticles that modify the energy landscape through plasmon resonance. This enables reduced turn-on voltage and improved charge injection efficiency without complicating the device structure

Inventive Principle:

Principle #35Parameter changes

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 use of nanoparticles improves luminous efficiency and extends the lifetime of electroluminescent diodes by reducing the driving current and voltage needed for the same luminance, stabilizing the driving current, and increasing the operational stability of the diodes.

Implementation Method 1

Incorporating nanoparticles in the light emitting structure layer of electroluminescent diodes to enhance luminous efficiency by promoting radiation processes through resonance with plasmons

Methodology Applied

Scientific EffectPlasmon resonance: Resonance

Implementation Method 2

using an energy transfer layer to reduce turn-on voltage, thereby reducing the required driving current and voltage

Methodology Applied

Scientific EffectEnergy transfer:

Data Source

PatentUS11515498B2Array substrate, display panel, and display apparatus

Publication Date: 2022.11.29 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

An array substrate (100) includes a first type of electroluminescent diode (110). The first type of electroluminescent diode (110) includes a first electrode (111), alight emitting structure layer (112) comprising nanoparticles (114), and a second electrode (113) disposed in a stacked manner. The nanoparticles (114) may be configured to increase luminous efficiency of the first type of electroluminescent diode (110).