Color Converting Sheet UV Stability via Bromine Monomer Matrix
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Solution Overview
Problem
Current color conversion sheets and light emitting diode devices face challenges with UV stability, color fastness, concentration quenching of fluorescent materials, plant growth enhancement, and insect repellent properties, particularly in absorbing UV and purple light.
Innovation Solution
A novel composition comprising inorganic fluorescent materials with peak emission wavelengths between 660 nm to 730 nm and blue light emitting inorganic fluorescent materials around 450 nm, combined with a matrix material containing bromine and sulfur-containing monomers, which improves UV stability, plant growth, and insect repellency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluorescent materials and matrix materials are used in color conversion sheets, then the basic color conversion function is achieved, but UV stability and color fastness are insufficient
Solution Approach 1:
The patent employs composite materials by combining specific fluorescent materials (K2SiF6:Mn4+ and BaMgAl10O17:Eu2+) with a bromine-containing monomer matrix material. This composite structure provides both the color conversion function and enhanced UV stability, as the bromine-containing monomer matrix protects the fluorescent materials from UV degradation while maintaining color fastness.
2Productivity
If high concentration of fluorescent materials is used to improve conversion efficiency, then more light is converted, but concentration quenching occurs reducing performance
Solution Approach 1:
The patent optimizes the concentration parameters of fluorescent materials within specific ranges (K2SiF6:Mn4+ at 1-10 wt% and BaMgAl10O17:Eu2+ at 85-98 wt%) to achieve the best balance between conversion efficiency and avoiding concentration quenching. The bromine-containing monomer matrix also helps distribute the fluorescent materials uniformly, preventing aggregation that would cause quenching.
3Object-affected harmful factors
If the color conversion sheet absorbs UV light, then harmful insects are repelled, but plant growth may be affected by reducing available UV spectrum
Solution Approach 1:
The patent converts the potentially harmful effect of UV absorption into a benefit by using the absorbed UV energy to excite the fluorescent materials, which then emit blue light (450-480 nm) that is beneficial for plant growth. The bromine-containing monomer matrix absorbs UV light to repel harmful insects, while the fluorescent materials convert this absorbed energy into useful blue light wavelengths that promote photosynthesis and plant development.
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 enhances UV stability, color retention, plant growth promotion, and insect deterrence by effectively converting UV and purple light into beneficial wavelengths for plant growth while maintaining blue light transmission.
Implementation Method 1
at least one inorganic fluorescent material having the peak emission light wavelength in the range from 660 nm to 730 nm
Implementation Method 2
at least one blue light emitting inorganic fluorescent material having peak light emission wavelength around 450nm
Data Source
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AI summary
The present invention relates to a composition comprising a fluorescent material and a matrix material.