Surface-Modified Inorganic Oxide Particles for Light Scattering
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Solution Overview
Problem
Existing white optical semiconductor light emitting devices with blue light sources pose health risks due to high blue light emission, and increasing the content of light scattering particles to reduce blue light irradiation leads to settling issues and non-uniform scattering layers.
Innovation Solution
A composition of surface-modified inorganic oxide particles with specific size and surface modification, dispersed in a matrix resin, forms a light scattering composite that enhances scattering properties while maintaining transparency and uniformity, even with reduced particle content, by controlling the surface modification state and average particle diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the content of light scattering particles is increased to suppress blue light irradiation and enhance white light luminance, then the light scattering ability is improved, but settling of particles occurs in uncured resin and uniform scattering layer cannot be obtained
Solution Approach 1:
The patent applies parameter changes by precisely controlling the average particle diameter of inorganic oxide particles within 1-100 nm and their content within 1-50 mass% relative to the phosphor. This optimization resolves the contradiction by finding the optimal parameter range where sufficient light scattering occurs without causing particle settling, thereby maintaining both blue light suppression and layer uniformity
Solution Approach 2:
The patent uses composite materials by combining inorganic oxide particles (such as SiO2, TiO2, ZnO, Al2O3) with phosphor particles in a resin matrix to form a light scattering conversion layer. This composite structure enhances light scattering ability while maintaining proper dispersion and preventing settling, thus resolving the contradiction between scattering performance and composition stability
2Object-affected harmful factors
If the particle diameter of light scattering particles is increased to enhance light scattering ability, then the scattering efficiency is improved, but settling of particles occurs in uncured resin
Solution Approach 1:
The patent applies parameter changes by optimizing the particle diameter of inorganic oxide particles to a specific range of 1-100 nm. This size optimization resolves the contradiction by providing particles that are large enough to scatter light effectively but small enough to remain stably dispersed in the uncured resin without settling
Solution Approach 2:
The patent introduces a surface-modifying agent as an intermediary substance that coats the inorganic oxide particles. This surface modification improves particle-resin compatibility and prevents aggregation, thereby maintaining dispersion stability while preserving the light scattering ability of the particles
3Stability of the object's composition
If the content of light scattering particles is reduced to prevent settling and maintain uniformity, then the composition stability is improved, but light scattering ability decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the content of inorganic oxide particles within 1-50 mass% relative to the phosphor. This content optimization resolves the contradiction by providing sufficient particle concentration for effective light scattering while maintaining stable dispersion and preventing settling
Solution Approach 2:
The patent applies local quality by creating a uniform distribution of inorganic oxide particles throughout the light scattering conversion layer. This uniform local distribution ensures that each region of the layer contributes effectively to light scattering, maximizing the scattering ability at optimal particle content levels without causing settling
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 provides a white optical semiconductor light emitting device with improved light transmitting and scattering properties, reducing blue light irradiation and enhancing luminance while maintaining color rendering properties.
Implementation Method 1
in a view that light scattering is usually presumed to be caused by Rayleigh scattering, a light scattering ability is proportional to a content of light scattering particles
Implementation Method 2
surface-modified inorganic oxide particles surface-modified by a surface modification material having one or more functional groups selected from an alkenyl group, an H-Si group, and an alkoxy group
Data Source
Figure 1~4
AI summary
By using a composition for forming a light scattering composite, including surface-modified inorganic oxide particles surface-modified by a surface modification material having one or more functional groups selected from an alkenyl group, an H-Si group, and an alkoxy group, and an uncured matrix resin composition, in which an average dispersed particle diameter of the surface-modified inorganic oxide particles is 3 nm or more and 150 nm or less, and a content of the surface-modified inorganic oxide particles is 0.01% by mass or more and 15% by mass or less in a total solid content, it is possible to provide a white optical semiconductor light emitting device which has excellent light transmitting properties and scattering properties even if the content of light scattering particles is reduced, and as a result, further suppresses blue light irradiation and enhances a white light luminance, while enhancing color rendering properties.