QLED Light-Emitting Layer Structure for Heat Diffusion Reliability

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Solution Overview

Problem

Quantum-dot light-emitting diodes (QLEDs) face issues with heat dissipation due to low thermal conductivity in the quantum dot layer and surrounding organic layers, leading to heat accumulation, degradation, and non-light-emitting recombination or exciton quenching.

Innovation Solution

Incorporating a layer containing a material with a bandgap of 3.0 eV or more and thermal conductivity of 200 W/mK or more between the electrodes to enhance heat diffusion and reliability, while preventing current leakage and exciton quenching.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a layer containing graphene is provided between the cathode and the anode to improve heat dissipation, then heat diffusion is improved, but current leakage occurs and exciton quenching increases

Engineering Contradiction:

Improveheat diffusionVSAvoidcurrent leakage and exciton quenching

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent introduces an intermediary layer containing a material with a bandgap of 3.0 eV or more between the electrodes. This intermediary material serves as a mediator that conducts heat effectively (thermal conductivity of 200 W/mK or more) while blocking current leakage and preventing exciton quenching, thus resolving the contradiction between heat diffusion and reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the key parameters of the intermediary material by selecting materials with specific properties: bandgap ≥ 3.0 eV and thermal conductivity ≥ 200 W/mK. This parameter change enables the material to simultaneously achieve good heat conduction while maintaining electrical insulation and preventing exciton quenching

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the quantum dot layer and surrounding organic layers are used as is, then the device structure remains simple, but heat accumulation occurs leading to degradation

Engineering Contradiction:

Improvedevice structureVSAvoidheat accumulation and degradation

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent creates a composite structure by incorporating the high-thermal-conductivity intermediary material layer between the electrodes and the quantum dot layer. This composite structure combines the benefits of simple device architecture with enhanced heat dissipation capability, preventing heat accumulation and material degradation while maintaining reliability

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 solution effectively diffuses heat, reduces degradation, and maintains high reliability without increasing non-light-emitting recombination or exciton quenching, enhancing the performance of QLEDs.

Implementation Method 1

at least one layer provided between the first electrode and the second electrode, and containing a first material having a bandgap of 3.0 eV or more and a thermal conductivity of 200 W/mK or more

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20250374746A1Light-emitting element, light-emitting device, and method for manufacturing light-emitting element

Publication Date: 2025.12.04 SHARP DISPLAY TECHNOLOGY CORP

AI summary

A light-emitting element includes: an anode and a cathode; and at least one layer provided between the anode and the cathode, and containing a first material having a bandgap of 3.0 eV or more and a thermal conductivity of 200 W/mK or more.