Quantum Dot Light Emitting Device Patterning via Sacrificial Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The preparation of high-resolution quantum dot light emitting display devices faces challenges such as low product yield and high production costs due to the limited resolution of quantum dot light emitting layers formed by printing methods, which often result in color mixing issues in full-color displays.
Innovation Solution
A method involving the use of a sacrificial layer and photoresist patterning to create a patterned quantum dot light emitting layer, where the sacrificial layer is stripped using ultrasonic treatment in an alcohol solvent, preventing the quantum dot material from remaining in underlying layers and thus avoiding color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If printing methods are used to form quantum dot light emitting layers, then the device can be manufactured, but the resolution is limited and color mixing occurs in full-color displays
Solution Approach 1:
The patent divides the quantum dot light emitting layer formation into separate color regions using sacrificial layers and photoresist patterns. Each color (red, green, blue) is deposited in its designated area, preventing mixing. The sacrificial layer is patterned to define precise boundaries, and quantum dot material is selectively deposited only where needed, achieving high-resolution color separation.
Solution Approach 2:
The sacrificial layer acts as an intermediary between the photoresist pattern and the quantum dot material layer. It transfers the patterned structure to the quantum dot layer through selective stripping. The sacrificial layer is removed in specific areas to allow quantum dot material to adhere only to the underlying function layer in those exposed regions, preventing color mixing while maintaining resolution.
2Productivity
If conventional patterning methods are used, then the quantum dot layer can be formed, but the product yield is low and production cost is high
Solution Approach 1:
The sacrificial layer is formed and patterned before depositing the quantum dot material layer. This preliminary patterning step creates a template that guides subsequent quantum dot deposition, ensuring high-resolution patterns are achieved in a single step rather than requiring multiple complex processing steps, thereby improving yield and reducing cost.
Solution Approach 2:
The sacrificial layer is intentionally discarded (stripped) after serving its patterning function. By removing the sacrificial layer selectively, the patent releases the quantum dot material from unwanted areas while retaining it in desired areas. This discarding step simplifies the overall process compared to complex etching or lithography, improving manufacturing efficiency and product yield.
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 effectively prevents color mixing in full-color quantum dot display panels by ensuring the quantum dot light emitting layer is accurately patterned, improving resolution and yield while reducing production costs.
Implementation Method 1
the sacrificial layer is stripped using ultrasonic treatment in an alcohol solvent
Implementation Method 2
ultrasonic treatment in an alcohol solvent
Implementation Method 3
An electric field is applied to the quantum dot light emitting display panel to move electrons and holes into the light emitting layer. In the light emitting layer, electrons and holes are trapped in quantum dots and recombine to emit photons.
Implementation Method 4
The quantum dot has a quantum confinement effect and can emit fluorescence after being excited
Implementation Method 5
patterning the first photoresist layer to form a first photoresist pattern
Data Source
AI summary
Embodiments of the present disclosure provide a preparation method of a quantum dot light emitting device and a preparation method of a quantum dot display panel, which includes: providing a base substrate; forming a first sacrificial layer on the base substrate; patterning the first sacrificial layer to form a first sacrificial layer pattern, in which the base substrate includes a first part and a second part, the first sacrificial layer pattern is on the first part, the second part is exposed by the first sacrificial layer pattern; forming a first quantum dot material layer on the base substrate; stripping the first sacrificial layer pattern to remove the first sacrificial layer pattern, the first quantum dot material layer on the first sacrificial layer pattern, and retaining the first quantum dot material layer on the second part of the base substrate to form a first quantum dot light emitting layer.