Phosphorus-Modified Metal Oxide Sol for High Refractive Index Thin Films
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Solution Overview
Problem
Current methods for producing thin films with high refractive indices and transparency face challenges such as limited thermal and chemical stability, difficulty in achieving high refractive indices, and inefficient patterning processes, particularly for metal oxide films which are brittle and require expensive deposition methods.
Innovation Solution
A method involving a sol containing metal oxides modified with specific organic phosphorus compounds, which are UV curable, allowing for quick and accurate patterning, and further enhanced by thermal or optical energy to achieve refractive indices of 1.8 or higher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vaporization or sputtering is used to deposit metal oxide thin films, then high refractive index (2.0 or more) and high optical transparency are achieved, but the process becomes expensive and inefficient
Solution Approach 1:
The patent replaces mechanical deposition methods (vaporization, sputtering) with a chemical solution-based approach. A sol containing metal oxide particles dispersed in a carrier polymer is applied to the substrate, eliminating the need for expensive and inefficient vacuum deposition equipment while achieving comparable optical properties.
Solution Approach 2:
The patent introduces a carrier polymer as an intermediary medium to disperse and deliver metal oxide particles to the substrate. This intermediary enables the metal oxide to be applied in a soluble, processable form that can be deposited at low temperatures without requiring vacuum deposition equipment.
2Strength
If thermal curing is applied to the coating for complete polymerization, then the film achieves high mechanical strength and adhesion, but quick and accurate patterning becomes difficult
Solution Approach 1:
The patent applies partial curing by controlling the UV irradiation conditions to achieve sufficient crosslinking for patterning without complete thermal curing. This partial action allows the film to be patterned accurately before final strength development, resolving the contradiction between adhesion and patterning ease.
Solution Approach 2:
The patent performs preliminary patterning through UV curing before final thermal treatment. The UV irradiation creates a partially cured patterned structure that can be precisely defined, and subsequent thermal processing completes the curing to achieve final mechanical strength and adhesion.
3Temperature
If organic polymers are used to form thin films at low temperature, then excellent mechanical properties and high surface adhesiveness are achieved, but the refractive index is limited to about 1.65 to 1.70
Solution Approach 1:
The patent creates a composite material system combining metal oxide particles (titanium oxide, zirconium oxide, etc.) with a carrier polymer. This composite structure provides the low-temperature processing benefits of organic polymers while the dispersed metal oxide particles contribute high refractive index, achieving both low formation temperature and high refractive index (1.70 to 1.80).
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 enables the production of accurately patterned thin films with high refractive indices and transparency, allowing for easy adjustment of refractive index values while maintaining transparency and improving adhesion to the substrate.
Implementation Method 1
a coating formed from a sol containing a metal oxide modified with an organic phosphorus compound having a specific structure (hereinafter referred to as phosphorus-modified metal oxide sol) is UV curable
Implementation Method 2
further heating the cured film for the decomposition of organic matter
Data Source
AI summary
Provided are a method for easily and quickly producing a patterned thin film having a high refractive index and a high transparency, and a highly refractive thin film produced by the method. The method comprises a first step: a step of forming, on a substrate, a coating using a sol containing a metal oxide modified with a phosphorus compound represented by the following formula (1): (wherein R1 is a hydrogen atom, an alkyl group, an alkynyl group, an alkenyl group, an aryl group, an aliphatic heterocyclic group, or an aromatic heterocyclic group; R2 is a divalent organic residue; and n is 1 or 2) ; a second step: a step of curing the coating on the substrate obtained in the first step by light irradiation; and a third step: a step of further adding energy to the cured film obtained in the second step by heating and/or light irradiation.