Phosphor Coating Stability via Silicon Oxide Nanoparticle Adhesion
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Solution Overview
Problem
The existing phosphor dispersed systems in fluorescent lamps face issues with light conversion efficiency, particularly when exposed to shorter wavelength light, and suffer from poor coating stability due to the absorption of short wavelength light by binding agents like nano-aluminum oxide and silica particles.
Innovation Solution
A method involving the modification of phosphors by adding them to an aqueous solution with silicon oxide nanoparticles, where the pH value is adjusted to optimize zeta potential, followed by mixing with a silicone resin to create a phosphor composition that enhances light conversion efficiency and coating uniformity, using a weight ratio of phosphor to silicon nanoparticles between 1:0.001 and 1:0.1 and to silicone resin between 1:0.005 and 1:0.1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If nano-aluminum oxide is used as binding agent, then light conversion efficiency is improved at 254 nm wavelength, but light conversion efficiency decreases when exposed to shorter wavelength light due to absorption
Solution Approach 1:
The patent extracts and removes the problematic binding agents (nano-aluminum oxide and silica particles) that absorb short wavelength light. Instead, it uses a binder-free approach where phosphor particles are directly dispersed in the coating slurry, eliminating the harmful absorption effect while maintaining coating functionality.
Solution Approach 2:
The patent changes the key parameter of binding agent selection by eliminating traditional binding agents entirely. It optimizes the dispersion medium composition and phosphor particle surface treatment to achieve stable coating without materials that absorb vacuum UV light, thereby improving light conversion efficiency across all wavelengths.
2Object-affected harmful factors
If silica particles are used as binding agent, then absorption of short wavelength light is reduced, but coating stability deteriorates and uniform coating layer formation becomes difficult
Solution Approach 1:
The patent removes silica particles and all traditional binding agents from the system. It replaces them with a optimized dispersion medium that provides sufficient viscosity and adhesion without requiring separate binding agent components, thereby achieving both low light absorption and good coating stability.
Solution Approach 2:
The patent creates a composite coating slurry system combining phosphor particles with specifically formulated dispersion media containing surfactants and viscosity modifiers. This composite approach achieves coating stability and uniformity without using binding agents that would absorb harmful radiation.
3Stability of the object's composition
If traditional binding agents are used, then phosphor dispersion stability is maintained, but light conversion efficiency decreases due to absorption of excitation light
Solution Approach 1:
The patent extracts and eliminates traditional binding agents from the phosphor dispersed system. It achieves dispersion stability through optimized particle surface treatment and dispersion medium formulation, removing the source of light absorption while maintaining coating integrity.
Solution Approach 2:
The patent introduces surfactants and dispersion aids as intermediary substances that mediate between phosphor particles and the coating medium. These intermediaries provide steric or electrostatic stabilization without absorbing vacuum UV light, replacing the function of traditional binding agents without their harmful effects.
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 approach significantly improves light conversion efficiency and coating stability, allowing for uniform and adherent phosphor layers on surfaces, such as quartz tubes, even under vacuum ultraviolet excitation, while maintaining high irradiance and processability.
Implementation Method 1
A plurality of oxide of silicon nanoparticles are adhered to the phosphor
Implementation Method 2
the phosphor can only be excited by the residual vacuum ultraviolet to cause the light conversion efficiency decreasing
Data Source
AI summary
A method of modifying a phosphor and a phosphor composition and a manufacturing method of the same and a phosphor solution are provided. The phosphor composition includes a silicone resin and a modified phosphor. The modified phosphor includes a phosphor and a nano-silica particle. The nano-silica particle is adhered to the phosphor. A weight ratio of the modified phosphor to the silicone resin is substantially between 1:0.005 and 1:0.1.