Siloxane Compound for LED Encapsulant Refractive Index
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Solution Overview
Problem
Current cross-linked silicone polymers used as encapsulants for LEDs suffer from low refractive index, leading to reduced light output due to internal reflections, and generate volatile organic compounds (VOCs) during condensation reactions, which are undesirable for high-temperature stability and environmental reasons.
Innovation Solution
Development of siloxane compounds with a high percentage of cyclotrisiloxane repeating units and a process involving a Lewis acid catalyst to produce cross-linked silicone polymers that do not produce VOCs, offering a higher refractive index and improved thermal stability.
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 patent extracts and eliminates the harmful by-product (VOCs) from the condensation reaction process by using alternative siloxane compounds with cyclotrisiloxane repeating units that do not generate carbon-containing VOCs during curing, while maintaining the desired cross-linked polymer structure and temperature stability
Solution Approach 2:
The patent changes the chemical composition parameters of the siloxane compounds by incorporating cyclotrisiloxane repeating units with specific structures (Formula I) where R1-R4 are selected from various groups, fundamentally altering the reaction pathway to eliminate VOC generation while preserving thermal stability
2Illumination intensity
If conventional siloxane compounds are used to produce cross-linked silicone polymers, then the polymers can be used as encapsulants for LEDs, but the refractive index is low causing reduced light output
Solution Approach 1:
The patent changes the refractive index parameter by incorporating cyclotrisiloxane repeating units with specific substituent groups (R1-R4) that increase the density and polarizability of the polymer matrix, thereby increasing the refractive index to reduce internal reflections and improve LED light output
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 results in cross-linked silicone polymers with enhanced refractive index, reduced internal reflections, and minimal VOC generation, improving light output and thermal stability for LED encapsulants while being environmentally friendly.
Implementation Method 1
a process involving a Lewis acid catalyst to produce cross-linked silicone polymers
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.