Quantum Dot Patterned Film via Ligand-Stamp Pattern Transfer
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Solution Overview
Problem
Current quantum dot electroluminescent technology faces challenges in industrial application due to complex preparation processes and low production yields, with existing patterning methods like nanoimprint and photolithography suffering from residue issues and performance degradation.
Innovation Solution
A method for preparing a quantum dot patterned film involves attaching a quantum dot precursor solution to a functional transport layer substrate, contacting it with a photosensitive ligand stamp, performing imprinting and ligand exchange, followed by exposure and development treatments to achieve a high-precision, lossless quantum dot pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography technology is used to pattern quantum dot film, then a better quantum dot pattern can be obtained, but photosensitive ligands in the quantum dot film affect subsequent device operations and may affect carrier transport or capture carriers as recombination centers
Solution Approach 1:
The patent divides the patterning process into two independent stages: first forming the quantum dot pattern structure through contact printing, then removing the photosensitive ligand stamp. This segmentation allows the pattern formation to proceed without photosensitive ligands remaining in the final quantum dot film, thus maintaining carrier transport performance while achieving good pattern quality.
Solution Approach 2:
The patent extracts and removes the photosensitive ligand stamp after it has served its patterning function. By taking out the photosensitive component after pattern formation, the quantum dot film is left without photosensitive ligands that would otherwise interfere with carrier transport, while still achieving the desired pattern structure.
2Ease of manufacture
If nanoimprint technology is used to pattern quantum dot film, then patterning can be achieved, but quantum dot residues occur at imprinted positions resulting in unclear and incomplete patterned structures
Solution Approach 1:
The patent introduces a photosensitive ligand stamp as an intermediary medium that transfers the pattern to the quantum dot film through contact printing. This intermediary approach allows pattern transfer without direct mechanical imprinting on the quantum dots themselves, avoiding residue formation and achieving clear, complete patterns.
3Adaptability or versatility
If photosensitive ligands are mixed with quantum dots in precursor solution, then photolithography patterning can be performed, but the preparation process becomes complex and production yield decreases
Solution Approach 1:
The patent segments the patterning process into separate steps: first preparing the quantum dot film without photosensitive ligands, then using a photosensitive ligand stamp for pattern transfer. This segmentation eliminates the need for mixing photosensitive ligands with quantum dots in the precursor solution, simplifying the preparation process and improving production yield while maintaining patterning flexibility.
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 method improves the purity and performance of quantum dot films by avoiding the need for additional imprinting force and mixing with photosensitive ligands, resulting in high-precision, lossless quantum dot patterns that maintain the luminescence performance of quantum dots.
Implementation Method 1
a patterned mask is used for photolithography, so that the photosensitive ligands are photocrosslinked by light
Implementation Method 2
S1, attaching a quantum dot precursor solution to a functional transport layer substrate to obtain a wet film having a quantum dot layer
Implementation Method 3
contacting the quantum dot layer of the wet film with the ligand layer of the photosensitive ligand stamp, performing imprinting treatment
Data Source
AI summary
The present disclosure provides quantum dot patterned film and preparation method thereof, electron transport layer, and quantum dot electroluminescent device. The preparation method includes: S1, attaching a quantum dot precursor solution to a functional transport layer substrate to obtain a wet film having a quantum dot layer; S2, attaching a photosensitive ligand to a patterned surface of a prefabricated nano stamp to obtain a photosensitive ligand stamp having a ligand layer; S3, contacting the quantum dot layer of the wet film with the ligand layer of the photosensitive ligand stamp, performing imprinting treatment, so as to obtain a ligand exchange quantum dot film; and S4, performing on the ligand exchange quantum dot film to obtain the quantum dot patterned film. The preparation method solves the problems in the related art that the preparation process of the quantum dot patterned film is complex and the production yield is relatively low.