High-Refractive Coating Material for Thick LED Protective Layers
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Solution Overview
Problem
It is challenging to form a film with a high refractive index and adequate thickness using inorganic materials due to processing difficulties, which limits their application in coating layers for light-emitting devices.
Innovation Solution
A coating material comprising modified particles with a core of zinc, titanium, or zirconium oxides, coupled with a silane coupling agent and a reactive compound, which allows for the formation of a stable and high refractive index coating layer with sufficient thickness and light-transmittance through specific weight ratios and surface modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If inorganic materials are used to form a coating film, then the refractive index is improved, but the processing difficulty increases and adequate thickness cannot be achieved
Solution Approach 1:
The patent uses composite particles combining inorganic oxide cores (high refractive index) with silane coupling agent shells (processability). This composite structure allows the coating to achieve high refractive index (1.7-2.4) while maintaining ease of manufacture through solution processing and curing.
Solution Approach 2:
The silane coupling agent acts as an intermediary between the inorganic oxide core and the organic polymer matrix. It provides surface modification that enables adequate thickness formation and processing compatibility while preserving the high refractive index property of the inorganic core.
2Illumination intensity
If inorganic materials are used to form a coating film, then the refractive index is improved, but the film thickness is insufficient
Solution Approach 1:
The composite particle structure with silane coupling agent shell enables the formation of thicker films (20-40 micrometers) while maintaining high refractive index. The shell provides structural integrity and adhesion that allows adequate thickness accumulation without compromising optical properties.
Solution Approach 2:
The patent optimizes particle size parameters (0.1-10 micrometers) and weight ratios of components to enable formation of adequate film thickness. The silane coupling agent shell thickness and core composition ratios are tuned to achieve both sufficient thickness and high refractive index simultaneously.
3Ease of manufacture
If organic polymer is used to form a coating film, then the processing is easier, but the refractive index is insufficient
Solution Approach 1:
The hybrid composite combines organic polymer matrix (ease of processing) with inorganic oxide cores (high refractive index). The silane coupling agent shell facilitates integration of inorganic particles into the organic matrix, achieving both processing ease and high refractive index (1.7-2.4).
Solution Approach 2:
The coating system exhibits local quality differentiation: the inorganic oxide cores provide high refractive index locally, while the organic polymer matrix provides ease of processing globally. The silane coupling agent shell enables this functional differentiation to coexist in a unified coating 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 coating material achieves a refractive index of 1.7 to 2.4, light-transmittance of 90% to 99.5%, and a thickness of 20 to 40 micrometers, effectively protecting light-emitting elements by tuning refractive index and maintaining high light-transmittance.
Implementation Method 1
The silane coupling agent has an epoxy group or a double-bond grafted onto the surface of the core
Implementation Method 2
the reactive compound includes a non-silicon multi-epoxy compound and a silicon-containing multi-epoxy compound. When the silane coupling agent having the double-bond is grafted onto the surface of the core, the reactive compound includes a multi double-bond compound
Data Source
AI summary
A coating material includes a modified particle and a reactive compound. The modified particle includes a core, and a silane coupling agent having an epoxy group (or a double-bond) grafted onto a surface of the core. When the silane coupling agent having the epoxy group is grafted onto the surface of the core, the reactive compound includes a non-silicon multi-epoxy compound and a silicon-containing multi-epoxy compound. When the silane coupling agent having the double-bond is grafted onto the surface of the core, the reactive compound includes a multi double-bond compound.