Optical Composition with Polysilsesquioxane Dispersion
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Solution Overview
Problem
Conventional optical bonding compositions prone to yellowing when exposed to light and elevated temperatures, due to organic components, which affects the stability and refractive index of optical connections in optical systems.
Innovation Solution
An optical composition comprising polysilsesquioxane and polysiloxane with non-surface-modified particles, which stabilizes the particles without the need for organic dispersants, reducing the risk of yellowing and improving light and temperature stability, while allowing for adjustable refractive index and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional organic dispersants are used to stabilize particles in optical bonding composition, then particle stabilization is achieved, but yellowing occurs when exposed to light and elevated temperatures
Solution Approach 1:
The patent removes organic dispersants from the optical bonding composition entirely, replacing them with an inorganic dispersant system based on silica particles and ammonia. This extraction of organic components eliminates the source of yellowing while maintaining particle stabilization functionality through the inorganic alternative.
Solution Approach 2:
The patent changes the chemical nature of the dispersant from organic to inorganic, specifically using silica particles with ammonia treatment. This parameter change in the dispersant type provides particle stabilization without the photodegradation and yellowing issues associated with organic dispersants under light and heat exposure.
2Illumination intensity
If organic components are used in optical bonding composition, then refractive index adjustment is achieved, but light absorption increases due to yellowing
Solution Approach 1:
The patent extracts all organic components from the optical bonding composition, including organic dispersants and organic modifiers. This removal eliminates the yellowing mechanism that causes light absorption, thereby maintaining high light transmission and illumination intensity through the bonding layer.
Solution Approach 2:
The patent creates an inorganic composite system combining silica particles, ammonia, and inorganic binders to replace organic materials. This composite inorganic system provides the necessary refractive index adjustment and particle stabilization without the light-absorbing yellowing characteristic of organic components.
3Productivity
If nanoparticles are added to increase refractive index, then light outcoupling efficiency is improved, but composition complexity increases due to need for dispersants
Solution Approach 1:
The patent removes the need for complex organic dispersant systems by using a simplified inorganic approach with silica particles and ammonia. This extraction reduces composition complexity while maintaining the ability to disperse nanoparticles for high light outcoupling efficiency.
Solution Approach 2:
The patent changes the dispersant system from complex organic molecules to a simple inorganic system based on silica and ammonia. This parameter change simplifies the overall composition while effectively stabilizing nanoparticles to achieve high refractive index and light outcoupling efficiency.
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 provides a stable, transparent optical bonding layer with enhanced thermal conductivity and refractive index, minimizing yellowing and manufacturing costs, and improving wall plug efficiency in optical systems.
Implementation Method 1
The polysilsesquioxane stabilizes these particles in the optical composition
Implementation Method 2
enhanced thermal conductivity
Implementation Method 3
refractive index
Data Source
Figure 1
AI summary
An optical composition is provided,comprising: -a polysilsesquioxane comprising repeating units of the formula [R-SiO1.5], wherein each R independently is hydrogen or a C1-C12 alkyl, aryl, alkene, arylene, alkenyl or alkoxy; -a polysiloxane, optionally substituted; and -particles dispersed in said polysiloxane. The polysilsesquioxane is able to disperse the particles in the polysiloxane, thus providing an optical composition comprising stably dispersed particles. The particles may be utilized to tune the refractive index or another optical property of the composition. Due to the low organics content, the composition has reduced risk of yellowing. The invention also relates to a bonding layer comprising an optical composition, an optical system comprising an optical composition, a method for preparing an optical composition and an optical system, respectively, and the use of a polysilsesquioxane for dispersing particles in a polysiloxane material.