Double Core-Shell Fluorescent Material via Metal Particle Resonance
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Solution Overview
Problem
Current luminescent materials, such as SiO2@(Y, Eu)2O3, have low luminous intensity and are not suitable for industrialization due to high rare earth element requirements and suboptimal morphology, limiting their application in high-definition displays.
Innovation Solution
A double core-shell fluorescent material is developed with a metal particle inner core, a silicon dioxide inner shell, and a phosphor outer shell represented by (R1-x, Eux)2O3, where R is Y, Gd, or a combination thereof, with a dual-core-shell structure that reduces phosphor amounts and enhances luminous efficiency through surface plasma resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If SiO2@(Y, Eu)2O3 phosphor is prepared using conventional core-shell structure, then rare earth element amount is reduced, but luminous intensity is low and cannot achieve industrialization
Solution Approach 1:
The patent applies a double core-shell structure where a metal particle core is nested within a silicon dioxide shell, which is in turn nested within a phosphor shell. This nested configuration allows the metal particle to enhance luminous intensity through surface plasma resonance while the outer phosphor shell provides the necessary luminescence properties, resolving the contradiction between reducing rare earth elements and maintaining high luminous intensity.
Solution Approach 2:
The patent creates a composite fluorescent material combining metal particles, silicon dioxide, and phosphor in a specific double core-shell arrangement. This composite structure leverages the surface plasma resonance effect of metal particles combined with the luminescence properties of phosphor, achieving both reduced rare earth content and enhanced luminous intensity simultaneously.
2Shape
If spherical phosphor is prepared using coprecipitation method, then particle morphology is improved with uniform size distribution, but rare earth raw material consumption increases and manufacturing cost rises
Solution Approach 1:
The double core-shell structure allows the phosphor layer to be applied only on the surface of the metal particle core, rather than requiring bulk spherical phosphor particles. This reduces the overall quantity of rare earth materials needed while maintaining the desired spherical morphology and uniform size distribution through the templating effect of the metal core.
3Ease of manufacture
If conventional single core-shell structure is used, then preparation process is simple, but luminous efficiency is low and industrial application is limited
Solution Approach 1:
The double core-shell structure can be formed through sequential coating processes that build upon each other, maintaining relative simplicity in manufacturing. The metal particle core is first formed, then the silicon dioxide shell is coated, followed by the phosphor shell. This stepwise nested construction achieves high luminous efficiency through surface plasma resonance enhancement while keeping the preparation process manageable for industrial production.
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 double core-shell structure improves luminous intensity and uniformity, reduces phosphor usage, and simplifies production with a low-cost sol-gel method, making it suitable for industrial applications.
Implementation Method 1
since the metal particle is coated by the phosphor, the fluorescence can be enhanced via a surface plasma resonance produced by the metal particle
Data Source
AI summary
Double core-shell fluorescent materials and preparation methods thereof are provided. The double core-shell fluorescent materials include inner core, inner shell coating the inner core and outer shell coating the said inner shell. The inner core is metal particle and the chemical constitution of the inner shell is silicon dioxide. The outer shell is fluorescent powder represented by the following chemical formula: (R1-x, Eux)2O3, wherein R is Y, Gd or combination thereof, 0.02≦x≦0.1. The double core-shell fluorescent materials with uniform and stable luminous effect not only increase luminous intensity, but also decrease usage amount of fluorescent powder by using metal particle as inner core.