Curable Silicone Composition for Optical Semiconductor Sealing
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Solution Overview
Problem
Curable silicone compositions used in optical semiconductor devices face issues with high gas permeability, leading to discoloration and reduced brightness due to corrosive gases, and increased viscosity which affects handleability and mechanical characteristics of the cured products.
Innovation Solution
A curable silicone composition comprising specific organopolysiloxane resins, organosiloxanes with silicon-bonded hydrogen atoms, and a hydrosilylation reaction catalyst, formulated to achieve a high refractive index and low gas permeability, improving handleability and mechanical properties of the cured product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If diphenylsiloxane units are increased to achieve high refractive index, then refractive index is improved, but viscosity increases and handleability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratios of different siloxane units (specifically limiting diphenylsiloxane units to 30-70 mol% and controlling the ratio of diphenylsiloxane to other diorganosiloxane units to 0.3-2.0). This optimization achieves the desired refractive index while maintaining acceptable viscosity and handleability for the curable silicone composition.
2Illumination intensity
If diphenylsiloxane units are increased to achieve high refractive index, then refractive index is improved, but mechanical characteristics of cured product are reduced
Solution Approach 1:
The patent resolves this contradiction by optimizing the compositional parameters, specifically controlling the ratio of diphenylsiloxane units to other diorganosiloxane units within 0.3-2.0 and the overall diphenylsiloxane content to 30-70 mol%. This balanced composition achieves high refractive index while maintaining adequate mechanical properties in the cured product.
3Reliability
If curable silicone composition is used for sealing, then sealing function is provided, but gas permeability is high causing discoloration and reduced brightness
Solution Approach 1:
The patent employs composite materials by formulating a curable silicone composition containing multiple siloxane components with different functions: diphenylsiloxane units for high refractive index, other diorganosiloxane units for controlling viscosity and mechanical properties, and specific crosslinking agents. This composite structure achieves both effective sealing and reduced gas permeability, preventing discoloration and brightness reduction.
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 composition results in a cured product with enhanced refractive index, low gas permeability, and improved reliability of optical semiconductor devices, addressing the issues of discoloration and reduced brightness.
Implementation Method 1
a curable silicone composition comprising (A) 100 parts by mass of an organopolysiloxane resin having at least two alkenyl groups in a molecule... (C) an organosiloxane (C1)... and an organopolysiloxane (C2) having at least two silicon-bonded hydrogen atoms in a molecule... and (D) an effective amount of a hydrosilylation reaction catalyst
Data Source
AI summary
The present invention relates to a curable silicone composition comprising: (A) an organopolysiloxane resin having at least two alkenyl groups in a molecule; (B) an organopolysiloxane represented by a general formula; (C) an organosiloxane (C1) having silicon-bonded hydrogen atoms at both molecular terminals, an organopolysiloxane (C2) having at least two silicon-bonded hydrogen atoms in a molecule, or a mixture of components (C1) and (C2); and (D) a hydrosilylation reaction catalyst. The curable silicone composition has excellent handleability and can form a cured product with a high refractive index and low gas permeability when cured.