Core-Shell Silicate Luminescent Materials for LED Efficiency
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Solution Overview
Problem
Current silicate luminescent materials used in white light LEDs have low luminous efficiency and poor color rendering, limiting their application in lighting and display technologies.
Innovation Solution
Development of silicate luminescent materials doped with metal nano-particles, specifically (Ba1-yAy)2-xSiO4:Eu x,Dz@Mn, where A is Sr, Ca, Mg, or Zn, D is F or Cl, and M is Ag, Au, Pt, Pd, or Cu, with a core-shell structure, enhancing luminous intensity and stability through a simple and low-pollution preparation method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional silicate luminescent materials are used, then the materials have good processing adaptability and moderate synthesis temperature, but the luminous efficiency is low and color rendering is poor
Solution Approach 1:
The patent creates a core-shell composite structure where metal nanoparticles (core) are coated with silicate fluorescent powder (shell). This composite structure combines the plasmonic enhancement properties of metals with the luminescent properties of silicates, achieving high luminous efficiency while maintaining processing adaptability. The core-shell configuration allows the material to benefit from both components' advantages.
Solution Approach 2:
The invention applies local quality modification by concentrating metal nanoparticles at the core region and silicate fluorescent material at the shell region. This spatial distribution optimizes the local properties: the metal core provides localized surface plasmon resonance for enhanced excitation, while the silicate shell provides efficient luminescence emission, together resolving the contradiction between ease of manufacture and luminous efficiency.
2Loss of energy
If metal nanoparticles are doped into silicate luminescent materials, then the internal quantum efficiency and luminous intensity increase, but the device complexity increases
Solution Approach 1:
The patent employs preliminary action by pre-synthesizing metal nanoparticles with controlled sizes and shapes before incorporating them into the silicate matrix. This pre-preparation step allows for optimization of the metal component's properties independently, then integrates them into the final composite structure, achieving high internal quantum efficiency without excessively complicating the overall device fabrication process.
Solution Approach 2:
The invention segments the luminescent material into distinct functional components: metal nanoparticles for plasmonic enhancement and silicate fluorescent powder for light emission. This segmentation allows each component to be optimized independently for its specific function, then combined to achieve high internal quantum efficiency while managing structural complexity through modular design.
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 metal-doped silicate luminescent materials exhibit increased internal quantum efficiency, improved stability, and controllable morphology, suitable for industrial production and display applications, with enhanced luminous intensity and color-purity.
Implementation Method 1
The metal-doped silicate luminescent materials exhibit increased internal quantum efficiency, improved stability, and controllable morphology, suitable for industrial production and display applications, with enhanced luminous intensity and color-purity
Implementation Method 2
combining near-ultraviolet LED chips and red, green, blue trichromatic powders to produce white light LED
Implementation Method 3
adding surface treating agent into M nano-particles collosol, then successively adding ethanol, water, ammonium water and tetra ethoxy silane, obtaining solution containing nano-sphere of M nano-particles coated in SiO2
Implementation Method 4
adding precipitator, after stirring and reacting for 1 to 8h, placing precipitates into oven for drying to obtain precursor
Data Source
Figure 1~2
Figure 3
AI summary
Halo-silicate luminescent materials and preparation methods thereof are provided. The said luminescent materials are represented by the following general formula: (Ba1-y Ay)2-x SiO4:Eux,Dz@ Mn, wherein A is selected from one or two of Sr, Ca, Mg or Zn, D is selected from one of F or Cl, M is selected from at least one of Ag, Au, Pt, Pd or Cu metal nano-particles; @ is coating; (Ba1-y Ay)2-x SiO4:Eux,Dz is shell; 0.001<x≤0.15, 0<y≤0.5, 0≤z≤0.5, 0<n≤1×10-2. The said luminescent materials have excellent chemical stability and high luminous intensity. Furthermore, the luminescent materials have controlled spherical shape which is beneficial to the coating screen process and the improved displaying effect. The said preparation methods have simple technique, no pollution, manageable process conditions and low equipment requirement, and are beneficial to industry production.