Photosensitive Composition for Quantum Dot-Polymer Composite Patterns
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Solution Overview
Problem
Current techniques for patterning quantum dot-polymer composites face challenges in achieving uniformity and linearity due to the limited compatibility of quantum dots and inorganic light diffusing agents with organic material-based photosensitive compositions, leading to difficulties in pattern development and reduced luminous efficiency in display devices.
Innovation Solution
A photosensitive composition is developed that includes quantum dots with an organic ligand, a binder with a carboxyl group, a photopolymerizable monomer mixture with specific accessory monomers, and a photoinitiator, which allows for the uniform dispersion of quantum dots and inorganic light diffusing agents, improving the developability and linearity of the pattern, even with high concentrations of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If quantum dots and inorganic light diffusing agents are dispersed in polymer host matrix, then luminous efficiency and color purity are improved, but compatibility with organic material-based photosensitive compositions deteriorates, leading to poor pattern developability
Solution Approach 1:
The patent introduces a photosensitive polymer composition as an intermediary medium that bridges quantum dots and inorganic light diffusing agents with organic material-based photosensitive compositions. This composition contains specific components (quantum dots, inorganic light diffusing agents, photopolymerizable monomers, photoinitiators, and solvents) that enable uniform dispersion while maintaining compatibility with the photosensitive composition system, thereby achieving both high luminous efficiency and good pattern developability
Solution Approach 2:
The patent modifies the chemical and physical parameters of the polymer host matrix by incorporating specific photopolymerizable monomers with controlled carbon-carbon double bond content and specific photoinitiators. These parameter changes enhance the compatibility between the quantum dot-polymer composite and the photosensitive composition, enabling uniform dispersion and effective patterning while maintaining the luminous efficiency of the quantum dots
2Measurement precision
If high concentrations of quantum dots and inorganic light diffusing agents are used, then color purity and luminous efficiency are enhanced, but uniform dispersion and linearity of pattern deteriorate
Solution Approach 1:
The patent optimizes the concentration parameters and distribution characteristics of quantum dots and inorganic light diffusing agents within the polymer host matrix. By controlling the amount of each component and their spatial distribution through the photosensitive composition system, the patent achieves uniform dispersion even at high concentrations, maintaining both color purity and pattern linearity
Solution Approach 2:
The photosensitive polymer composition acts as an intermediary that facilitates uniform distribution of quantum dots and inorganic light diffusing agents throughout the matrix. This intermediary system prevents agglomeration and ensures homogeneous dispersion, enabling high concentrations to be maintained without compromising pattern linearity or uniformity
3Ease of manufacture
If conventional photosensitive compositions are used for patterning quantum dot-polymer composite, then processing is simplified, but breakpoint time and critical dimension uniformity are insufficient
Solution Approach 1:
The patent modifies the photopolymerization parameters by incorporating photopolymerizable monomers with specific carbon-carbon double bond content (1 to 6 double bonds) and appropriate photoinitiators. These parameter changes enhance the photopolymerization rate and responsiveness, achieving fast breakpoint time (less than 60 seconds) while maintaining critical dimension uniformity (less than 5%) and processing simplicity
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 composition achieves a breakpoint time of less than 60 seconds and critical dimension uniformity of less than 5%, enhancing the luminous efficiency and color reproducibility of quantum dot-polymer composite patterns, particularly in color filters for liquid crystal displays.
Implementation Method 1
a photopolymerizable monomer composition; a photoinitiator
Data Source
AI summary
A photosensitive composition includes a plurality of quantum dots including an organic ligand on the surface thereof; a binder; a photopolymerizable monomer composition; photoinitiator; and a solvent, wherein the photopolymerizable monomer includes a main monomer having 1 to 6 carbon-carbon double bonds, a first accessory monomer having 8 to 20 carbon-carbon double bonds, and a second accessory monomer represented by Chemical Formula A; and a method of preparing the photosensitive composition and a quantum dot-polymer composite pattern prepared therefrom are provided:R1O-(L1)m-L3-A-L4-(L2)n-OR2 Chemical Formula Awherein, A, L1, L2, L3, L4, R1, and R2 are the same as defined herein.