Curable Silicone Composition for Optical Semiconductor Devices
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Solution Overview
Problem
Curable silicone compositions used in optical semiconductor devices face issues with phosphor dispersibility, leading to uneven light emission, and have high gas permeability, which reduces light extraction efficiency and corrodes electrodes and phosphors due to low barrier properties.
Innovation Solution
A curable silicone composition comprising specific organopolysiloxanes with alkenyl and aryl groups, along with a hydrosilylation reaction catalyst, is formulated to enhance phosphor dispersibility and gas barrier properties, resulting in a cured product with improved strength and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional curable silicone composition is used, then the composition can be applied as a sealing agent, but the phosphor aggregates due to poor dispersibility causing uneven light emission
Solution Approach 1:
The patent modifies the chemical composition parameters of the silicone resin by incorporating specific ratios of methyl vinyl polysiloxane (0.1-0.5 mol/L vinyl group content) and crosslinking agents with controlled water content (0.1-10 mass%). These parameter changes optimize the resin's interaction with phosphor particles, enabling uniform dispersion and preventing aggregation during curing, thereby achieving even light emission while maintaining ease of manufacturing
Solution Approach 2:
The invention creates a composite sealing material system combining silicone resin base components with specific crosslinking agents (tetramethyl orthosilicate, methyl trimethoxysilane, or methyl triethoxysilane) and controlled water content. This composite formulation enhances phosphor compatibility and dispersibility while maintaining the sealing function, resolving the contradiction between reliability and manufacturing ease
2Strength
If a curable silicone composition with high gas permeability is used, then the composition provides good flexibility, but the electrodes and phosphor are corroded due to low barrier properties to sulfur and water
Solution Approach 1:
The patent optimizes the chemical composition parameters by controlling the types and amounts of crosslinking agents (0.1-10 mass% relative to silicone resin) and water content (0.1-10 mass%). This creates a balanced network structure that maintains flexibility while forming effective barrier properties against sulfur and water penetration, preventing corrosion of electrodes and phosphor
Solution Approach 2:
The invention develops a composite cured product structure combining crosslinked silicone polymer networks with controlled inorganic crosslinking components. This composite structure provides both mechanical flexibility and chemical barrier properties, simultaneously achieving strength and corrosion resistance by integrating organic-silicon backbone flexibility with inorganic crosslinking barrier layers
3Ease of manufacture
If a curable silicone composition with low strength is used, then the composition provides good phosphor dispersibility, but the cured product has insufficient strength and gas barrier properties
Solution Approach 1:
The patent carefully controls the crosslinking density parameters by adjusting crosslinking agent concentration (0.1-10 mass%) and water content (0.1-10 mass%). This optimization ensures sufficient crosslinking for mechanical strength while maintaining adequate free volume and network flexibility for phosphor dispersibility, achieving both ease of manufacture with good dispersion and high cured product strength
Solution Approach 2:
The invention creates a dual-function composite network where the silicone polymer matrix provides phosphor compatibility and dispersibility, while the inorganic crosslinking structures (from tetramethyl orthosilicate, methyl trimethoxysilane, or methyl triethoxysilane) provide mechanical strength and gas barrier properties. This composite architecture simultaneously achieves ease of manufacture and high strength
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 achieves excellent phosphor dispersibility, high strength, and effective gas barrier properties, enhancing the reliability of optical semiconductor devices by ensuring uniform light emission and protecting components from corrosion.
Implementation Method 1
a curable silicone composition comprising: a straight-chain organopolysiloxane having at least two alkenyl groups and at least one aryl group in a molecule; a branched-chain organopolysiloxane having an alkenyl group and an aryl group; an organopolysiloxane having at least two silicon atom-bonded hydrogen atom in a molecule; and a hydrosilylation reaction catalyst
Data Source
Figure 1
AI summary
A curable silicone composition comprising: (A) an organopolysiloxane represented by the average unit formula: (R13SiO1/2)a(R22SiO2/2)b(R3SiO3/2)c (R1 are alkyl groups, alkenyl groups, aryl groups, or aralkyl groups; R2 are alkyl groups or alkenyl groups; R3 is an alkyl group, aryl group, or an aralkyl group, provided that, in a molecule, at least 0.5 mol% of R1 to R3 are the alkenyl groups, at least one of R3 is the aryl group or the aralkyl group; and a, b, and c are numbers satisfying: 0.01 ≤ a ≤ 0.5, 0.4 ≤ b ≤ 0.8, 0.01 ≤ c ≤ 0.5, and a + b + c = 1); (B) an organopolysiloxane that is different from component (A); (C) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms in a molecule; and (D) a hydrosilylation reaction catalyst. A cured product exhibiting excellent dispersibility of phosphor and having high strength and gas barrier properties is formed.