Hydrophilicity Variable Layer for OLED Quantum Dot Stability
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Solution Overview
Problem
OLED display devices have low luminous efficiency due to deterioration of the quantum-dot light emitting layer during manufacturing, resulting in reduced display efficiency.
Innovation Solution
A display substrate with light emitting units comprising an electron transport layer, a hole transport layer, and a quantum-dot light emitting layer, where a hydrophilicity and hydrophobicity variable layer is placed between the electron transport layer and the quantum-dot light emitting layer, which undergoes exposure treatment to change its hydrophilicity and hydrophobicity, protecting the quantum-dot light emitting layer from damage during development and improving luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a quantum-dot light emitting layer is used in OLED display devices, then the display device can achieve solution processing and preparation with excellent optical properties, but the quantum-dot light emitting layer deteriorates during manufacturing, resulting in low luminous efficiency
Solution Approach 1:
The patent introduces a hydrophilicity and hydrophobicity variable layer as an intermediary between the electron transport layer and the quantum-dot light emitting layer. This intermediate layer protects the quantum-dot light emitting layer from deterioration during manufacturing processes while maintaining excellent optical properties, thereby resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The patent utilizes a layer whose hydrophilicity and hydrophobicity parameters can be changed through exposure treatment. By controlling these parameter changes, the quantum-dot light emitting layer is protected from damage during development and manufacturing, improving both reliability and luminous efficiency without sacrificing the excellent optical properties of quantum dots.
2Loss of energy
If the quantum-dot light emitting layer is protected during manufacturing, then luminous efficiency is improved, but the manufacturing process becomes more complex due to the additional hydrophilicity and hydrophobicity variable layer
Solution Approach 1:
The hydrophilicity and hydrophobicity variable layer serves multiple functions simultaneously: it acts as a protective barrier for the quantum-dot light emitting layer, controls the development process through exposure treatment, and maintains the structural integrity of the display device. This multi-functionality reduces the need for additional separate protective layers, thereby limiting the increase in manufacturing complexity while improving luminous efficiency.
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 hydrophilicity and hydrophobicity variable layer enhances the interaction between the electron transport layer and the quantum-dot light emitting layer, preventing damage and improving luminous efficiency, thereby enhancing the display efficiency of the display device.
Implementation Method 1
configured to undergo an exposure treatment to change hydrophilicity and hydrophobicity of sides of the hydrophilicity and hydrophobicity variable layer that are in contact with the electron transport layer and the quantum-dot light emitting layer
Implementation Method 2
amino acids of the lower proteins which are in contact with the electron transport layer include amine functional groups which form hydrogen bonding adsorption effects with hydroxyl groups on a surface of the electron transport layer
Implementation Method 3
amino acids of the upper proteins which are in contact with the quantum-dot light emitting layer include amine functional groups, which coordinate with metal atoms on a nanocrystal surface of the quantum-dot light emitting layer to form adsorption effects
Data Source
AI summary
A display substrate, comprising a plurality of light emitting units of different colors, each of which comprises: an electron transport layer, a hole transport layer, a quantum-dot light emitting layer located between the electron transport layer and the hole transport layer; and a hydrophilicity and hydrophobicity variable layer, located between the electron transport layer and the quantum-dot light emitting layer and configured to undergo an exposure treatment to change hydrophilicity and hydrophobicity of sides of the hydrophilicity and hydrophobicity variable layer that are in contact with the electron transport layer and the quantum-dot light emitting layer.