Parylene-Coated Color-Converting Particles for Degradation Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Color-converting materials used in solid-state radiation transducer devices are prone to degradation due to reactions with environmental constituents and matrix materials, leading to reduced reliability and longevity, especially in smaller devices where heat-related degradation is more significant.
Innovation Solution
Parylene-coated color-converting particles are developed, where a parylene coating inhibits detrimental reactions between the color-converting material and environmental constituents or matrix materials, providing a protective barrier that slows or prevents degradation, even at standard temperature and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color-converting materials are milled into small particles to improve optical properties, then optical performance is improved, but susceptibility to degradation increases due to greater surface area
Solution Approach 1:
An encapsulant matrix is introduced as an intermediary material that surrounds and protects the color-converting particles from environmental constituents such as oxygen and water. The matrix acts as a barrier layer that isolates the particles while allowing them to maintain their small particle form for optimal optical properties.
Solution Approach 2:
The encapsulant matrix creates an inert protective environment around the color-converting particles, preventing direct contact with reactive environmental constituents. This inert barrier reduces oxidation and other detrimental reactions that would otherwise occur more readily with high-surface-area particles.
2Volume of moving object
If color-converting materials are used in smaller SSRT devices to reduce device size, then device miniaturization is achieved, but heat-related degradation increases
Solution Approach 1:
The encapsulant matrix serves as a thermal management intermediary that isolates the color-converting particles from direct heat exposure. The matrix material is selected to have appropriate thermal properties that reduce heat transfer to the particles while allowing the device to maintain compact dimensions.
Solution Approach 2:
The encapsulant matrix forms a protective shell around the color-converting particles, providing both physical protection and thermal isolation. This thin film barrier prevents direct heat contact while maintaining the miniaturized device structure.
3Reliability
If color-converting materials are protected with an encapsulant matrix to prevent degradation, then reliability is improved, but the matrix itself may be permeable to environmental constituents
Solution Approach 1:
A composite encapsulation system is employed where the encapsulant matrix is combined with other protective materials or coatings. This multi-layer composite structure provides enhanced barrier properties against environmental constituents while maintaining the protective function for the color-converting particles.
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 parylene coating effectively protects color-converting materials from degradation, maintaining the reliability and longevity of electronic devices by preventing reactions with environmental constituents and matrix materials, thus enhancing the performance and lifespan of solid-state radiation transducer devices.
Implementation Method 1
a parylene coating configured in accordance with several embodiments of the present technology can prevent, slow, or otherwise inhibit detrimental reactions between a color-converting material of a coated color-converting particle and an environmental constituent
Implementation Method 2
Color-converting materials (e.g., phosphor materials) absorb light at certain wavelengths and emit light at different wavelengths
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Coated color-converting particles and associated devices, systems, and methods are disclosed herein. A coating of the coated color-converting particles can include, for example, a parylene, such as a fluorinated parylene (e.g., parylene AF-4). In particular embodiments, the coating can be configured to protect a color-converting material of a particle core of the coated color-converting particles from detrimental reactions. For example, the coating can prevent, slow, or otherwise inhibit detrimental reactions between the color-converting material and a matrix material or between the color-converting material and an environmental constituent that can diffuse through a matrix. In particular embodiments, the coated color-converting particles can be incorporated into a matrix (e.g., a generally optically transmissive matrix) to form a composite. The composite can be used, for example, with a radiation transducer. Methods associated with the coated color-converting particles can include, for example, separating coated color-converting particles having acceptable coatings from coated color-converting particles having unacceptable coatings using relative buoyancy.