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 and crack resistance, leading to uneven light emission and reliability concerns in LEDs.
Innovation Solution
A curable silicone composition comprising an organopolysiloxane with specific molecular units, a straight-chain organopolysiloxane, silicon-bonded hydrogen atoms, and a hydrosilylation reaction catalyst, which enhances phosphor dispersibility and crack resistance when cured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional curable silicone composition is used, then the composition can be cured to form a sealing agent, but the phosphor dispersibility is poor causing light emission to become uneven
Solution Approach 1:
The patent modifies the chemical composition parameters of the silicone system by incorporating specific organopolysiloxanes with controlled molecular structures and ratios. This changes the physical and chemical properties of the base resin to achieve both excellent phosphor dispersibility and uniform light emission without compromising curing performance
Solution Approach 2:
The patent creates a composite silicone system combining multiple organopolysiloxane components with specific functional groups. This composite approach allows the material to simultaneously provide phosphor dispersion, mechanical strength, and optical uniformity that single-component systems cannot achieve
2Reliability
If a conventional curable silicone composition is used, then the composition can be cured to form a protective agent, but the cured product cracks when high current is applied continuously
Solution Approach 1:
The patent adjusts the molecular structure parameters and compositional ratios of the organopolysiloxanes to optimize the cured product's mechanical properties. This enables the material to withstand thermal and mechanical stress from high current operation without cracking
Solution Approach 2:
The patent introduces specific functional groups and molecular structures at strategic positions within the polymer network to enhance local flexibility and stress distribution, preventing crack propagation in high-stress regions
3Device complexity
If a branched-chain organopolysiloxane with high content is used, then the composition can be formulated, but the adhesion of the cured product to substrate is reduced
Solution Approach 1:
The patent precisely controls the molecular weight, branching degree, and compositional ratio of the organopolysiloxane components. This parameter optimization ensures adequate adhesion to substrates while maintaining formulation flexibility for other performance requirements
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 and crack resistance, resulting in improved reliability of optical semiconductor devices, particularly LEDs.
Implementation Method 1
a curable silicone composition comprising: an organopolysiloxane (A) represented by the average unit formula: (R1xR2yR3zSiO 1/2 ) n (in the formula, R 1 to R 3 are the same or different, and represent a monovalent hydrocarbon group; x, y, and z are numbers satisfying: 0.05 ≤ x ≤ 0.4, 0.1 ≤ y ≤ 0.4, 0.3 ≤ z ≤ 0.8, and x + y + z = 1; and n is an integer of 100 or greater); a straight-chain organopolysiloxane (B) having at least two alkenyl groups in a molecule; an organopolysiloxane (C) having at least two silicon-bonded hydrogen atoms 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)x(R22SiO2/2)y(R3SiO3/2)z (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 x, y and z are numbers satisfying: 0.01 ≤ x ≤ 0.5, 0.01 ≤ y ≤ 0.4, 0.1 ≤ z ≤ 0.9, and x + y + z = 1); (B) a straight-chain organopolysiloxane having at least two alkenyl groups in a molecule; (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 crack resistance is formed.