Surface-Modified Metal Oxide Particles for Optical Semiconductor Sealing
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Solution Overview
Problem
Existing silicone compositions used in optical semiconductor sealing materials face issues such as low refractive index, high gas permeability, large expansion coefficient, poor adhesion to substrates, and high viscosity, which affect the durability and transparency of the sealing materials.
Innovation Solution
Surface-modified metal oxide particles with a specific average primary particle diameter of 3-10 nm, treated with a silicone compound and a silylation material, are used to create a low-viscosity, high-transparency sealing material with improved refractive index and adhesion, reducing the need for solvents and enhancing the optical semiconductor device's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal oxide particles are dispersed into silicone compound to improve refractive index and adhesion, then optical properties and substrate adhesion are improved, but viscosity increases
Solution Approach 1:
The patent changes the particle size parameter of metal oxide particles to a specific range (1-10 nm) and controls the surface modification degree by adjusting the molar ratio of silane coupling agent to metal oxide particles. This optimization achieves the balance between improving refractive index and maintaining low viscosity, with the composition achieving refractive index of 1.48 or higher while maintaining viscosity at 1000 Pa·s or less at 25°C.
Solution Approach 2:
The patent creates a composite material system combining metal oxide particles (zirconium oxide, titanium oxide, or silicon oxide) with silicone compound, using silane coupling agents as surface modifiers. This composite structure allows the metal oxide particles to improve optical properties and adhesion while the silane modification prevents excessive viscosity increase by improving particle dispersion and reducing aggregation.
2Ease of operation
If surface modification amount is increased to improve dispersion, then viscosity decreases, but characteristics of metal oxide particles are not drawn out
Solution Approach 1:
The patent optimizes the surface modification degree by controlling the molar ratio of silane coupling agent to metal oxide particles within a specific range (0.01-1.0). This parameter optimization ensures that enough surface modification occurs to improve dispersion and reduce viscosity to 1000 Pa·s or less, while maintaining sufficient metal oxide particle characteristics for high refractive index of 1.48 or more.
3Illumination intensity
If large amount of metal oxide particles is used to improve refractive index, then optical properties are improved, but pores or cracks are generated in cured product
Solution Approach 1:
The patent creates a well-dispersed composite material system where metal oxide particles are uniformly distributed in the silicone compound matrix. The silane coupling agent modification prevents particle aggregation and ensures homogeneous distribution, allowing high metal oxide content for improved refractive index without forming pores or cracks in the cured product.
Solution Approach 2:
The patent controls the particle size of metal oxide particles within a specific range (1-10 nm) and optimizes the surface modification degree. These parameter changes ensure that metal oxide particles can be densely packed and uniformly distributed without causing defects, achieving high refractive index while maintaining cured product quality with no pores or cracks.
4Duration of action of stationary object
If conventional silicone composition is used for sealing, then durability such as heat resistance and light resistance is excellent, but refractive index is low and gas permeability is large
Solution Approach 1:
The patent develops a composite sealing material combining silicone compound with metal oxide particles (zirconium oxide, titanium oxide, or silicon oxide) and silane coupling agents. This composite structure maintains the excellent durability, heat resistance, and light resistance of silicone while the high refractive index metal oxide particles (refractive index 1.7 or higher) significantly improve the overall refractive index to 1.48 or more.
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 surface-modified metal oxide particles provide a low-viscosity, high-transparency sealing material that improves the optical and mechanical properties of the optical semiconductor device, enhancing light extraction efficiency and fluorescence intensity while minimizing solvent use and process complexity.
Implementation Method 1
the surface modification is performed using a silane coupling agent
Implementation Method 2
the surface modification is performed using a silane coupling agent
Implementation Method 3
fine particles of metal oxide having a specific average primary particle diameter
Implementation Method 4
refractive index is 1.7 or higher
Data Source
AI summary
There is provided a surface-modified-metal-oxide-particle material including surface-modified-metal-oxide-particles obtained by performing surface modification on metal oxide particles with a surface-modifying material, in which the surface-modifying material includes a predetermined silicone compound, an average primary particle diameter of the metal oxide particles is 3 nm to nm, viscosity at 25° C. is 1000 Pa·s or less, and transmittance of light at a wavelength of 400 nm to 800 nm and a thickness of 1 mm is 60% or greater, a composition for sealing optical semiconductor element, and an optical semiconductor device using the same.