Curable Silicone Composition for Optical Semiconductor Encapsulation
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Solution Overview
Problem
Existing curable silicone compositions used in optical semiconductor devices suffer from low light transmittance and poor adhesion to substrates, which affect the reliability and performance of these devices.
Innovation Solution
A curable silicone composition comprising an organopolysiloxane with alkenyl groups, an organohydrogenpolysiloxane, an adhesion promoter, and a hydrosilylation reaction catalyst, formulated to provide high adhesion and transparency, is used to encapsulate optical semiconductor elements, enhancing the reliability of the devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional curable silicone compositions are used, then the composition can be cured to form a protective layer, but the light transmittance of the cured product is low
Solution Approach 1:
The patent changes the chemical composition parameters of the silicone system by selecting specific organopolysiloxanes with controlled vinyl group content (0.01-0.5 mmol/g) and using adhesion promoters with specific molecular structures. This parameter optimization resolves the contradiction by achieving both high light transmittance (90% or more) and sufficient adhesion strength through precise compositional control.
Solution Approach 2:
The patent creates a composite curable silicone composition by combining multiple components: organopolysiloxane, organohydrogenpolysiloxane, adhesion promoter, and catalyst. This composite approach allows each component to contribute specific properties - the organopolysiloxane provides transparency, while the adhesion promoter ensures substrate bonding, thus resolving the contradiction between light transmittance and adhesion.
2Reliability
If conventional curable silicone compositions are used, then the composition can provide basic protective function, but the adhesion of the cured product to substrate is poor
Solution Approach 1:
The patent optimizes the vinyl group content parameter of the organopolysiloxane to a specific range (0.01-0.5 mmol/g) and controls the ratio of components. This parameter control ensures that the cured product achieves both strong adhesion to substrates and high light transmittance (90% or more), resolving the contradiction between these two properties.
Solution Approach 2:
The patent introduces an adhesion promoter as an intermediary substance that mediates between the silicone composition and the substrate. This adhesion promoter contains specific functional groups that enhance substrate bonding while maintaining the optical transparency of the overall composition, thus resolving the contradiction between adhesion and light transmittance.
3Illumination intensity
If existing silicone compositions are used, then the composition can be manufactured with standard processes, but the cured product lacks transparency
Solution Approach 1:
The patent specifies precise parameter ranges for the organopolysiloxane (vinyl group content: 0.01-0.5 mmol/g, average molecular weight: 1000-100000) and component ratios to achieve transparency. These controlled parameters ensure high light transmittance (90% or more) while maintaining manufacturability through standardized production processes.
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 forms a transparent cured product with high adhesion to substrates, improving the reliability and performance of optical semiconductor devices by ensuring effective encapsulation and protection of the semiconductor elements.
Implementation Method 1
Curable silicone compositions that cure through a hydrosilylation reaction are used as protective agents or coating agents for optical semiconductor elements
Data Source
AI summary
A curable silicone composition comprising: (A) an organopolysiloxane having at least two alkenyl groups in a molecule; (B) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule; (C) an adhesion promoter represented by the average unit formula; and (D) a hydrosilylation reaction catalyst. Provided is a curable silicone composition for forming a transparent cured product having high adhesion to a substrate, and an optical semiconductor device having excellent reliability made using the composition.