Quantum Dot Display Device Ultraviolet Irradiation Efficiency
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Solution Overview
Problem
The existing methods for improving luminous efficiency in display devices with quantum dot light-emitting layers are not easily scalable or efficient, necessitating a new approach.
Innovation Solution
A display device configuration that includes a light-emitting element layer with a first and second electrode, and a first quantum dot light-emitting layer between them, irradiated with ultraviolet light from a light source element to enhance luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If ligands are removed from quantum dot shells to increase luminous efficiency, then luminous efficiency is improved, but the process complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts and removes specific ligands (such as oleic acid) from the quantum dot shell surface. This selective removal increases the accessibility of quantum dots to excitons and enhances luminous efficiency without requiring complete restructuring of the quantum dot core-shell architecture, thus improving manufacturability compared to more aggressive modification approaches
Solution Approach 2:
The patent changes the chemical composition parameters of the quantum dot shell by controlling the ratio and types of ligands present. By adjusting ligand concentration and types (e.g., using a mixture of oleic acid and oleylamine), the patent optimizes both luminous efficiency and processability, resolving the contradiction between performance and manufacturability
2Loss of energy
If a complex light-emitting layer formation process is used to improve luminous efficiency, then luminous efficiency is improved, but device complexity increases
Solution Approach 1:
The patent combines the quantum dot light-emitting layer with organic light-emitting layers (such as Alq3) in a single integrated structure. The quantum dots and organic compounds work synergistically, where the organic layer facilitates exciton generation and transfer to quantum dots, achieving high luminous efficiency without requiring separate complex subsystems for light generation and emission enhancement
3Illumination intensity
If high power is used to achieve high luminance, then luminance is improved, but energy consumption increases
Solution Approach 1:
The patent introduces organic light-emitting compounds (such as Alq3) as intermediary materials between the electrical excitation source and the quantum dots. These organic compounds act as mediators that efficiently convert electrical energy to excitons, which then transfer energy to quantum dots for light emission. This intermediary mechanism achieves high luminance with lower direct power requirements compared to pure electroluminescence approaches
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 enhances the luminous efficiency of the light-emitting element layer by combining electro- and photoluminescence, allowing for higher luminance and reduced power consumption.
Implementation Method 1
by irradiating the light-emitting element layer with the ultraviolet light from the light source element, it is possible to enhance the luminous efficiency of the light-emitting element layer
Implementation Method 2
A display device according to an aspect of the disclosure includes a light-emitting element layer including a first electrode and a second electrode, and a first quantum dot light-emitting layer disposed between the first electrode and the second electrode
Data Source
AI summary
A display device includes a light-emitting element layer including a first electrode and a second electrode, and a first quantum dot light-emitting layer disposed between the first electrode and the second electrode, and a light source element configured to irradiate the light-emitting element layer with ultraviolet light.