Quantum Dot Ligand Design for Residue-Free Photoetching
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Solution Overview
Problem
The current process of direct patterning quantum dots in quantum dot light-emitting diode (QLED) displays is prone to residue formation, leading to color mixing in full-color displays and affecting the display effect due to incomplete removal of excess quantum dot material during the development process.
Innovation Solution
A quantum dot material with a quantum dot ligand that forms a coordination interaction, enhancing solubility in polar solvents, allowing for complete removal of excess material during photoetching, thereby preventing color mixing. The ligand structure includes specific polar groups and linkage groups that improve solubility and stability, and a photosensitive group for patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If direct patterning of quantum dots is performed using photoetching process, then high-resolution quantum dot display can be prepared, but residues are formed after development process causing color mixing and affecting display effect
Solution Approach 1:
The patent modifies the chemical parameters of the quantum dot material by introducing specific polar groups (carboxyl, hydroxyl, amino, or carbonyl groups) into the ligand structure. This parameter change enhances the solubility and responsiveness of the quantum dot material to polar solvents, enabling complete removal of excess material during development without leaving residues that would cause color mixing.
Solution Approach 2:
The patent uses polar solvents as intermediaries to facilitate the removal of excess quantum dot material during the development process. The modified quantum dot material with polar groups interacts with the polar solvent, enabling selective dissolution of excess material while maintaining the patterned regions, thus preventing residue formation without compromising pattern resolution.
2Ease of manufacture
If quantum dot material with conventional ligands is used, then quantum dot display can be manufactured, but excess material cannot be completely removed during development process
Solution Approach 1:
The patent changes the chemical parameters of the ligand by incorporating polar functional groups (carboxyl, hydroxyl, amino, or carbonyl groups) that enhance interaction with polar solvents. This parameter modification enables complete removal of excess quantum dot material during development while maintaining ease of manufacture through a simple photoetching process.
3Stability of the object's composition
If quantum dot material with low solubility is used, then material stability is maintained, but complete removal of excess material during photoetching is difficult
Solution Approach 1:
The patent introduces polar groups into the ligand structure, changing the solubility parameter of the quantum dot material. This modification enables the material to be sufficiently soluble in polar solvents for complete removal of excess material during development, while maintaining stability during the manufacturing process through controlled interaction with the solvent system.
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 quantum dot material effectively reduces residual quantum dot material by up to 40%, preventing color mixing and enhancing the display effect by ensuring complete removal during the photoetching process, thus improving the luminescent brightness and stability of the quantum dot light-emitting device.
Implementation Method 1
a quantum dot ligand forming a coordination interaction with the quantum dot body
Implementation Method 2
the quantum dot ligand further comprises: a photosensitive group
Data Source
AI summary
The disclosure provides quantum dot materials, quantum dot light-emitting devices and preparation methods thereof. The quantum dot material comprises a quantum dot body and a quantum dot ligand forming a coordination interaction therewith, the quantum dot ligand satisfying a first general formula comprising:wherein A is a ligand group, B is a first linkage group, C1 is a first polar group, C2 is a second polar group, D1 is a second linkage group, D2 is a third linkage group, E is a terminal group; m is an integer greater than or equal to 1; i is an integer greater than or equal to 1; the first linkage group comprises —(CH2)n—; the second and third linkage groups each comprise at least one ofand n is an integer greater than or equal to 0.