Halogen Silicate Luminescent Material with Metal Nanoparticles
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Solution Overview
Problem
Conventional LED white light sources have poor color reproductivity and low color rendering index due to the limitations of traditional silicate and aluminosilicate luminescent materials, which also suffer from low luminous efficiency, poor stability, and complex synthesis requirements.
Innovation Solution
A halogen silicate luminescent material with a chemical formula (N1-a-b Eu a Mn b)10Si6O21Cl2:xM, where M is Ag, Au, or Pt, and N is an alkaline earth metal, is developed with a core-shell structure to enhance luminous intensity through surface plasmon resonance, and a simplified preparation method using M@SiO2 microsphere powder and sol-gel or high-temperature solid-phase processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional silicate and aluminosilicate luminescent materials are used in LED white light, then the LED can be manufactured with conventional materials, but the color rendering index is low and luminous efficiency is poor
Solution Approach 1:
The patent uses a composite luminescent material consisting of an alkaline earth halogen silicate host matrix combined with metal nanoparticles (Ag, Au, Pt, or Pd) and rare earth dopants (Eu and Mn). This composite structure enables the material to achieve high luminous efficiency and excellent color rendering (RA > 85) while maintaining ease of manufacture through a simplified one-pot sol-gel synthesis method, resolving the contradiction between manufacturability and performance.
Solution Approach 2:
The patent optimizes multiple parameters including the doping concentrations of Eu (0.01-0.10 mol) and Mn (0.01-0.05 mol), the amount of metal nanoparticles (0.001-0.010 mol), and the sintering temperature (900-1200°C) to achieve the optimal balance between luminous efficiency, color rendering index, and manufacturability. These parameter optimizations allow the material to exceed conventional performance while remaining compatible with standard LED manufacturing processes.
2Device complexity
If conventional LED white light uses yellow luminescent material and blue LED light, then the LED structure is simple, but the color reproductivity is poor and color rendering index is low
Solution Approach 1:
The patent incorporates multiple dopants (Eu and Mn) with specific local functions within the halogen silicate matrix. Eu provides strong UV absorption and blue-green emission, while Mn contributes to red emission and color stability. This localized functional distribution within a single material system achieves excellent color reproductivity (RA > 85) without increasing LED structural complexity, as the material itself provides the multi-color emission characteristics.
3Ease of manufacture
If traditional fluorescent powders are used for white LED, then the synthesis process is established, but the synthesis is difficult and equipment requirements are high
Solution Approach 1:
The patent employs a one-pot sol-gel synthesis method where all reagents (alkaline earth metal halides, silicon source, metal nanoparticles, and rare earth dopants) are mixed in a single container and processed together through controlled hydrolysis and condensation reactions. This preliminary action of combining all components in one pot eliminates the need for multiple separate synthesis steps and complex equipment, reducing both equipment requirements and synthesis difficulty while maintaining process establishment.
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 halogen silicate luminescent material achieves high luminous efficiency, excellent stability, and a color rendering index above 85%, with improved internal quantum efficiency and simplified industrial production processes.
Implementation Method 1
the luminous intensity of the alkaline earth halogen silicate (N1-a-b Eu a Mn b)10Si6O21Cl2 of the shell being enhanced by M in the form of metal nanometer core through the produced surface plasmon resonance effect
Data Source
Figure 1~2
AI summary
Disclosed is a halogen silicate luminescent material having a chemical structural formula of (N1-a-bEuaMnb)10Si6O21Cl2:xM, and the preparation method thereof, where M is at least one of Ag, Au, Pt and Pd, N is an alkaline earth metal and specifically at least one of Mg, Ca, Sr and Ba, 0 < x ≤ 1×10-2, 0 < a≤0.3, and 0 ≤ b ≤ 0.3. The above halogen silicate luminescent material having the core-shell structure can be used to improve internal quantum efficiency and luminous intensity of the luminescent material by making use of the surface plasmon resonance generated by the surface of metal nanoparticles; besides, the above halogen silicate luminescent material has excellent stability, a color rendering index more than 85%, and good luminescent property, and can be applied to LED; moreover, the above preparation method has the advantages of simple operation, no pollution, easy control, low requirements for equipment, and being favorable to industrialized production, and can be widely applied to the field of preparation of the luminescent materials.