Fluorescent Material Adhesion via Rare-Earth Phosphate Coating
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Solution Overview
Problem
Existing light-emitting devices require improvement in durability for use in harsh environments due to issues with resin curing and adhesion between fluorescent materials and resins, leading to reduced performance over time.
Innovation Solution
A method for producing rare-earth phosphate-adhered fluoride fluorescent material particles by preparing fluoride particles with specific compositions, causing rare-earth phosphate to adhere to them in a liquid medium, and separating them to create a highly durable red light-emitting fluorescent material for use in light-emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorescent material particles are used in light-emitting devices, then light emission function is achieved, but adhesion between fluorescent material and resin deteriorates leading to reduced durability
Solution Approach 1:
The patent applies the intermediary principle by introducing a silane coupling agent as a mediator between the fluorescent material particles and the resin. The silane coupling agent forms a chemical bridge that enhances adhesion: one end bonds with the resin matrix while the other end interacts with the fluorescent material particle surface, thereby resolving the adhesion deterioration problem without compromising durability
Solution Approach 2:
The patent applies parameter changes by modifying the surface properties of fluorescent material particles through silane treatment. This chemical modification changes surface energy, surface chemistry, and wettability parameters, enabling better compatibility and adhesion with the resin matrix, thus improving both adhesion strength and overall device durability
2Illumination intensity
If high electric current is applied to maintain initial performance, then light emission intensity is maintained, but resin curing and adhesion deteriorate due to harsh conditions
Solution Approach 1:
The patent applies beforehand cushioning by pre-treating the fluorescent material particles with silane coupling agent before incorporating them into the resin matrix. This preliminary protective measure creates a robust interface that cushions against the damaging effects of high electric current, preventing resin degradation and adhesion failure even when initial performance maintenance requires high current operation
3Illumination intensity
If fluorescent material particles are dispersed in resin, then light emission is achieved, but light scattering increases reducing device performance
Solution Approach 1:
The patent applies parameter changes by modifying the surface characteristics of fluorescent material particles through silane treatment. This changes surface energy and wettability parameters, enabling better dispersion and reduced aggregation in the resin matrix. The improved surface properties minimize light scattering by creating a more homogeneous distribution and reducing interfacial refractive index differences, thereby maintaining light emission performance while reducing harmful scattering
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 the durability of light-emitting devices by improving adhesion between the fluorescent material and resin, maintaining initial performance even under high electric current conditions and reducing light scattering, thus extending the device's lifespan.
Implementation Method 1
causing at least one cation selected from rare-earth elements and a phosphate ion to come into contact with each other in a liquid medium containing the fluorescent material particles to obtain rare-earth phosphate-adhered fluorescent material particles including the fluorescent material particles to which the rare-earth phosphate is adhered
Data Source
AI summary
A method for producing a fluorescent material can be provided. The method includes preparing fluorescent material particles that contain a fluoride having a composition including Mn, at least one selected from the group consisting of alkali metal elements and NH4+, and at least one selected from the group consisting of Group 4 elements and Group 14 elements; causing at least one cation selected from rare-earth elements and a phosphate ion to come into contact with each other in a liquid medium containing the fluorescent material particles to obtain rare-earth phosphate-adhered fluorescent material particles including the fluorescent material particles to which the rare-earth phosphate is adhered; and separating the rare-earth phosphate-adhered fluorescent material particles from the liquid medium.