Quantum Dot Layer Uniformity via UV Cleavable Ligand Bonding
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Solution Overview
Problem
The film thickness of the quantum dot layer in quantum dot light emitting diode (QLED) display devices formed by lift-off methods often becomes non-uniform, leading to issues with light emission and material utilization efficiency.
Innovation Solution
A method involving a substrate with an oxide, where a first solution containing specific functional groups is applied and irradiated with ultraviolet light, followed by the application of halogenated quantum dots to form a quantum dot layer without lift-off, ensuring uniform film thickness through chemical bonding and controlled ligand exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a quantum dot layer is formed by lift-off, then the manufacturing process is simple, but the film thickness becomes non-uniform
Solution Approach 1:
The patent replaces the mechanical lift-off process with a chemical bonding approach. Instead of mechanically removing a sacrificial layer to form the quantum dot layer, the invention uses chemical functional groups (amino, carboxyl, thiol, or selenol groups) that bond directly to the oxide substrate, eliminating the need for mechanical lift-off and achieving uniform film thickness through controlled chemical deposition.
Solution Approach 2:
The patent changes the chemical parameters of the quantum dot layer formation process by introducing specific functional groups that can coordinate with the oxide substrate. By controlling the chemical composition and bonding characteristics rather than relying on mechanical processes, the film thickness uniformity is improved while maintaining ease of manufacture through solution-based application.
2Productivity
If lift-off method is used to form quantum dot layer, then material utilization efficiency is low, but the process is well-established
Solution Approach 1:
The patent eliminates the need to discard the quantum dot layer during the lift-off process. By using direct chemical bonding to the substrate, the quantum dots remain in place and can be reused for subsequent processing steps, significantly improving material utilization efficiency while the process remains straightforward through solution-based application.
Solution Approach 2:
By replacing the mechanical lift-off system with a chemical bonding system, the patent avoids the material waste inherent in lift-off methods where the sacrificial layer and associated quantum dots must be removed and replaced, thereby improving material utilization 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
This approach prevents non-uniform film thickness and enhances material utilization efficiency by ensuring high definition and luminous performance in QLED display devices, allowing for the reuse of quantum dots and improved light emission.
Implementation Method 1
a second functional group that is cleaved by being irradiated with ultraviolet light to generate any one of an amino group, a carboxyl group, a thiol group, and a selenol group
Implementation Method 2
a first functional group capable of being coordinated to the oxide
Implementation Method 3
applying a solution containing halogenated first quantum dots to a portion irradiated with the first ultraviolet light in the irradiating at least a part of the first solution applied to the substrate to form a first quantum dot layer
Data Source
AI summary
A method for manufacturing a display device includes: applying a first solution containing (a) and (b) to a substrate containing an oxide, (a) a first functional group capable of being coordinated to the oxide, (b) a second functional group that is cleaved by being irradiated with ultraviolet light to generate any one of an amino group, a carboxyl group, a thiol group, and a selenol group; irradiating at least a part of the first solution applied to the substrate with first ultraviolet light; and applying a solution containing halogenated first quantum dots to a portion irradiated with the first ultraviolet light in the irradiating at least a part of the first solution applied to the substrate to form a first quantum dot layer.