Metal Oxide Dispersion for Transparent LED Sealing Resins
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Solution Overview
Problem
Existing silicone resins used in LED sealing materials, such as methyl-based and phenyl-based silicone resins, face challenges in dispersing metal oxide particles uniformly, leading to agglomeration and turbidity issues, particularly when phenyl-based silicone resins are used, which affects the transparency and light extraction efficiency of LED packages.
Innovation Solution
A dispersion liquid containing metal oxide particles surface-modified with a silane compound containing a methyl group and a silicone compound with a hydrocarbon group having 2 or more carbon atoms, where the mole ratio of methyl groups to hydrocarbon groups is between 0.01 and 10, ensuring sufficient attachment of the surface-modifying material to prevent agglomeration and allow dispersion in both methyl-based and phenyl-based silicone resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If metal oxide particles are mixed with methyl-based silicone resin, then heat resistance is improved, but the particles agglomerate and transparency deteriorates
Solution Approach 1:
The surface hydrophobicity of metal oxide particles is modified by controlling the mole ratio of methyl groups to hydrocarbon groups in the range of 0.01 to 10. This parameter change enables the particles to be compatible with both methyl-based and phenyl-based silicone resins, preventing agglomeration while maintaining transparency and heat resistance
Solution Approach 2:
The invention uses composite surface modification on metal oxide particles, combining both methyl groups and hydrocarbon groups in specific ratios. This composite approach creates particles that can interface with different types of silicone resins, resolving the contradiction between heat resistance (methyl-based) and optical properties (phenyl-based)
2Illumination intensity
If metal oxide particles are mixed with phenyl-based silicone resin, then light extraction efficiency is improved, but the particles agglomerate and transparency deteriorates
Solution Approach 1:
By adjusting the surface hydrophobicity parameter (mole ratio of methyl to hydrocarbon groups) to fall within 0.01 to 10, the metal oxide particles achieve optimal compatibility with phenyl-based silicone resin, enabling both high light extraction efficiency and particle dispersion transparency
3Temperature
If surface modification is optimized for methyl-based resin, then heat resistance is improved, but dispersibility in phenyl-based resin deteriorates
Solution Approach 1:
The metal oxide particles are designed with dual functional groups (methyl and hydrocarbon) in balanced ratios, making them universally compatible with both methyl-based and phenyl-based silicone resins. This multi-functional surface modification allows the same particles to work optimally in different resin systems for various applications
Solution Approach 2:
The mole ratio parameter of methyl to hydrocarbon groups is precisely controlled within 0.01 to 10 to achieve universal dispersibility across different resin types, enabling the particles to maintain both heat resistance and optical properties in various sealing applications
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 enables the uniform dispersion of metal oxide particles in both methyl-based and phenyl-based silicone resins, improving the transparency and light extraction efficiency of LED packages by preventing agglomeration and maintaining the transparency of the sealing composition.
Implementation Method 1
metal oxide particles which have been surface-modified by a silane compound and a silicone compound
Implementation Method 2
metal oxide particles which have been surface-modified by a silane compound and a silicone compound
Implementation Method 3
a composition for forming a light scattering complex containing metal oxide particles
Data Source
AI summary
In a dispersion liquid according to the present invention, regarding metal oxide particles that are obtained by vacuum-drying a dispersion liquid containing metal oxide particles which have been surface-modified by a methyl group and a phenyl group in a predetermined ratio, in a case where a transmission spectrum in a wavenumber range of 800 cm−1 or higher and 3,800 cm−1 or lower is measured by FT-IR, and values of the transmission spectrum are standardized, IA/IB≤3.5 is satisfied (IA represents a spectrum value standardized at 3,500 cm−1, and IB represents a spectrum value standardized at 1,100 cm−1).