Imprinting Ink Composition for High-Index Patterned TMO Layers
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Solution Overview
Problem
Current methods for forming high refractive index patterned layers using transition metal oxide (TMO) materials face challenges such as 3D network formation, high shrinkage, and low refractive index due to reactive surface groups, leading to ill-defined features and degradation issues in optical applications.
Innovation Solution
An imprinting ink composition with at least 80% transition metal oxide nanoparticles and polymerization inhibitors, which prevents 3D network formation and allows for controlled polymerization at low temperatures, enabling the creation of dense patterned layers with high refractive indices through a solvent-based imprinting method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If sol-gel route is used to form patterned TMO layers, then continuous layers can be formed, but high shrinkage (70-90%) occurs during annealing leading to cracking and delamination
Solution Approach 1:
The invention changes the chemical composition parameters by using TMO nanoparticles with controlled surface chemistry instead of traditional sol-gel precursors. This allows forming dense patterned layers with refractive index >1.7 without the extreme shrinkage associated with sol-gel annealing, resolving the contradiction between layer integrity and pattern definition
Solution Approach 2:
The invention creates a composite material system combining TMO nanoparticles with a polymer matrix. This composite approach enables the formation of patterned layers that maintain structural integrity while achieving high refractive index, avoiding the cracking and delamination problems of pure sol-gel derived layers
2Stability of the object's composition
If TMO nanoparticle dispersions are used, then patterned layers can be formed without high shrinkage, but refractive index remains low due to porous structure
Solution Approach 1:
The invention changes the density and porosity parameters by using a two-component system of TMO nanoparticles and polymer matrix. This allows achieving dense patterned layers with refractive index exceeding 1.7, directly addressing the low refractive index problem of porous TMO nanoparticle layers while maintaining stability
Solution Approach 2:
By creating a composite of TMO nanoparticles embedded in a polymer matrix, the invention achieves both structural stability and high refractive index. The polymer matrix fills the pores and provides mechanical stability, while the TMO nanoparticles provide the high refractive index, resolving the contradiction between stability and optical performance
3Strength
If reactive surface groups on TMO particles are present, then 3D network formation occurs, but this leads to ill-defined features and degradation
Solution Approach 1:
The invention introduces a polymer matrix as an intermediary between TMO nanoparticles. This mediator prevents direct 3D network formation through reactive surface groups while maintaining particle dispersion and providing structural integrity, thus achieving well-defined features without degradation
Solution Approach 2:
The invention changes the interaction parameters between TMO particles by controlling surface chemistry and using polymer stabilization. This prevents uncontrolled 3D network formation while maintaining sufficient particle bonding for structural strength, resolving the contradiction between network formation and feature definition
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 solution achieves patterned layers with refractive indices exceeding 1.7, suitable for optical elements, with reduced shrinkage and stability issues, enabling applications in lighting, sensors, and photovoltaic devices.
Implementation Method 1
at least one polymerization inhibitor of any of Formula 1-3 present in a range of 0.07-7.00% by weight based on the total weight of the imprinting ink composition
Implementation Method 2
transition metal oxide nanoparticles... having a refractive index n of 2.3 across the visible part of the electromagnetic spectrum
Implementation Method 3
polymerizable content dissolved and/or dispersed in the solvent... Curing the polymeric content in the imprinting ink composition
Data Source
AI summary
Disclosed are imprinting ink compositions for use in imprinting techniques such as SCIL. The imprinting ink compositions comprise TMO nanoparticles stabilized by selected polymerization inhibitors that allow for the formation of a stable imprinting ink composition in which polymerization of the TMO nanoparticles is effectively suppressed and from which high refractive index patterned layers can be formed. Imprinting methods using such imprinting ink compositions, optical devices including patterned layers formed from such imprinting ink compositions and lighting devices, optical sensors and photovoltaic devices including such optical elements are also disclosed.