Quantum Dot Electroluminescence Patterning via Silane Coupling
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Solution Overview
Problem
Conventional methods for patterning light emitting layers containing quantum dots using the lift-off method face challenges due to the instability of quantum dots with ligands like tri-n-octylphosphine oxide (TOPO), which affects the stability and life characteristics of electroluminescence elements.
Innovation Solution
A method involving the use of a silane coupling agent attached to the surface of quantum dots, allowing for the formation of a stable light emitting layer that can withstand photoresist solvents and developers, improving adhesiveness and thermal stability, and enabling the patterning of multiple color light emitting layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum dots with ligands like TOPO are used in the light emitting layer, then the light emission characteristics are improved, but the stability and life characteristics of the electroluminescence element deteriorate due to dissolution in photoresist solvents
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance that attaches to the surface of quantum dots. This coupling agent acts as a mediator between the quantum dots and the photoresist layer, preventing the quantum dots from dissolving in photoresist solvents while maintaining their light emission characteristics. The silane coupling agent forms a protective interface that resolves the contradiction between stability and solvent resistance.
Solution Approach 2:
The patent creates a composite structure by combining quantum dots with silane coupling agents on their surfaces. This composite material approach allows the quantum dots to retain their optical properties while gaining enhanced stability and resistance to photoresist solvents through the silane coupling agent layer, thus resolving the contradiction between maintaining light emission characteristics and improving stability.
2Adaptability or versatility
If multiple color light emitting layers are patterned using the lift-off method, then the versatility of the display device is improved, but the process complexity increases due to multiple photoresist coating and development steps
Solution Approach 1:
The patent makes the light emitting layer universally compatible with multiple photoresist processing steps by treating it with a silane coupling agent. This treatment allows the same light emitting layer to serve multiple functions: maintaining quantum dot stability, providing adhesion for subsequent photoresist layers, and enabling repeated coating and development processes. The silane coupling agent creates a universal interface that simplifies the overall manufacturing process despite the need for multiple patterning steps.
3Strength
If the light emitting layer is treated to improve adhesion, then the adhesiveness between layers is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent merges the adhesion promotion function with the quantum dot stabilization function by using the silane coupling agent treatment for both purposes simultaneously. This single treatment step accomplishes multiple objectives: improving adhesion between the light emitting layer and photoresist, preventing quantum dot dissolution, and preparing the surface for subsequent processing. By combining multiple functions into one treatment, the patent avoids increasing overall process complexity while achieving improved adhesiveness.
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 method enhances the stability and life characteristics of electroluminescence elements by ensuring the quantum dots are not dissolved in photoresist solvents, improves adhesiveness between layers, and allows for efficient patterning of multiple color light emitting layers, thereby improving the overall performance and longevity of the electroluminescence elements.
Implementation Method 1
coating a coating liquid on the resultant substrate having the patterned photoresist layer, and curing the coating liquid to form a light emitting layer, the coating liquid containing a quantum dot having a silane coupling agent attached to the surface thereof
Implementation Method 2
exposing and developing the photoresist layer, and patterning the photoresist layer to ensure that a portion of the photoresist layer, which is located in a light emission area, is removed
Data Source
AI summary
The present invention provides a method for manufacturing an electroluminescence element that has a light emitting layer containing a quantum dot and exhibits excellent life characteristics. In the method, patterning of the light emitting layer can be stably performed by a lift-off method. A photoresist layer is formed on a substrate having a first electrode layer. The photoresist layer is then exposed, developed, and patterned to ensure that a portion of the photoresist layer, which is located in a light emission area, is removed. A coating liquid containing a quantum dot having a silane coupling agent attached to the surface thereof is coated on the resultant substrate having the patterned photoresist layer and cured to form a light emitting layer. The remaining photoresist layer is then removed to lift off a portion of the light emitting layer, which is present on the photoresist layer.