Curable Silicone Composition for Sulfur-Resistant Optical Packaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Curable silicone compositions used in optical semiconductor devices have low transmittance and fail to adequately inhibit discoloration of silver electrodes or silver-plated substrates due to sulfur-containing gases, affecting the reliability of these devices.
Innovation Solution
A curable silicone composition incorporating a crown compound, such as a crown ether, is used, which is cured via a hydrosilylation reaction, incorporating an organopolysiloxane, organohydrogenpolysiloxane, and a hydrosilylation reaction catalyst, to form a protective layer that inhibits discoloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zinc compound and polyalkylene oxide compound are added to curable silicone composition, then sulfur resistance is improved, but transmittance of cured product deteriorates
Solution Approach 1:
The patent removes zinc compound and polyalkylene oxide compound from the curable silicone composition. Instead, it uses a silane-modified polyethylene crosslinking agent that provides sulfur resistance without compromising transmittance, effectively extracting the harmful components while retaining the protective function.
Solution Approach 2:
The patent changes the chemical parameters of the crosslinking agent by using a silane-modified polyethylene crosslinking agent with specific silane content (0.1-10 mmol/g) and polyethylene unit content (30-70%). This parameter optimization achieves both sulfur resistance and high transmittance, resolving the contradiction between protection and optical clarity.
2Reliability
If conventional curable silicone composition is used, then basic sealing function is achieved, but sufficient inhibition of silver discoloration due to sulfur-containing gas is not achieved
Solution Approach 1:
The patent converts the potential harm of sulfur-containing gases into a beneficial protective mechanism. The silane-modified polyethylene crosslinking agent reacts with sulfur-containing gases to form a protective layer on the silver electrodes, converting the harmful sulfur into a protective barrier that prevents discoloration.
Solution Approach 2:
The patent creates a composite curable silicone composition combining organopolysiloxane, silane-modified polyethylene crosslinking agent, and hydrosilylation catalyst. This composite material provides both sealing functionality and enhanced sulfur resistance, achieving superior protection against silver discoloration compared to conventional single-material compositions.
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 effectively prevents discoloration of silver electrodes or substrates in optical semiconductor devices exposed to sulfur-containing gases, enhancing the reliability and performance of these devices.
Implementation Method 1
The crown compound is preferably a crown ether compound, a cyclic polyamine compound, or a cyclic polythioether compound... effectively prevents discoloration of silver electrodes or substrates in optical semiconductor devices exposed to sulfur-containing gases
Implementation Method 2
The curable silicone composition may be cured by a hydrosilylation reaction... (A) an organopolysiloxane having at least two aliphatic unsaturated hydrocarbon groups per molecule; (B) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule
Data Source
AI summary
A curable silicone composition is provided. The curable silicone composition is useful for forming a cured product which inhibits the discoloration of silver electrodes or a silver-plated substrate in an optical semiconductor device due to a sulfur-containing gas. The curable silicone composition comprises at least one type of a crown compound. An optical semiconductor device is also provided. The optical semiconductor device has excellent reliability after a sulfur resistance test, in which an optical semiconductor device on silver electrodes or a silver-plated substrate is sealed, covered, or adhered with a cured product of the curable silicone composition.