Cyclotrisiloxane Silicone Polymer for High-Index LED Encapsulants
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Solution Overview
Problem
Current siloxane compounds used in producing cross-linked silicone polymers either generate volatile organic compounds (VOCs) as by-products or have a low refractive index, making them unsuitable for high-power LED applications where high refractive index materials are needed.
Innovation Solution
Development of siloxane compounds with a high percentage of cyclotrisiloxane repeating units and a process involving a condensation reaction with a Lewis acid catalyst to produce cross-linked silicone polymers without VOCs, achieving a high refractive index suitable for LED encapsulants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If condensation reaction is used to produce cross-linked silicone polymers, then the polymers exhibit high temperature stability, but volatile organic compounds (VOCs) are generated as by-products
Solution Approach 1:
The invention changes the chemical reaction parameters by using ring-opening polymerization instead of condensation reaction. This alternative reaction pathway achieves cross-linking without generating VOC by-products, while maintaining the high temperature stability required for LED encapsulant applications
Solution Approach 2:
The invention converts the harmful condensation reaction that produces VOCs into a beneficial ring-opening polymerization process. By using cyclotrisiloxane repeating units as reactants, the process achieves cross-linking through ring-opening mechanisms that do not release volatile organic compounds, transforming a harmful process into an environmentally friendly one
2Illumination intensity
If conventional siloxane compounds are used to make cross-linked silicone polymers, then the polymers can be produced, but the refractive index remains low leading to reduced light output
Solution Approach 1:
The invention changes the molecular structure parameters of the siloxane compounds by incorporating cyclotrisiloxane repeating units with specific R1, R2, R3, and R4 substituents. This structural modification increases the refractive index of the resulting cross-linked silicone polymer, reducing internal reflections and improving light output from LED encapsulants
Solution Approach 2:
The invention creates a composite molecular structure within the siloxane compound by combining cyclotrisiloxane repeating units with various organic substituents (R1-R4 groups). This composite approach at the molecular level achieves both the desired high refractive index for optical performance and the cross-linking capability for thermal stability
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 solution provides cross-linked silicone polymers with a high refractive index, reducing internal reflections in LEDs and eliminating VOC generation, thus enhancing light output and environmental sustainability.
Implementation Method 1
a process involving a Lewis acid catalyst and solvent to produce cross-linked silicone polymers
Implementation Method 2
In the condensation reaction, the siloxane compounds react in a condensation reaction to form new Si—O—Si linkages between individual molecules
Data Source
AI summary
A siloxane compound comprises a plurality of siloxane repeating units and at least a portion of the siloxane repeating units are cyclosiloxane repeating units conforming to a specified structure. A process for producing such siloxane compounds is also provided. A process and kit for producing a cross-linked silicone polymer using the described siloxane compounds is also provided. A light emitting diode (LED) comprises an encapsulant, and the encapsulant comprises a cross-linked silicone polymer produced from the described siloxane compounds.