Germanate Luminescent Material Nanoparticle Doping FED
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Solution Overview
Problem
Current luminescent materials for field emission displays (FEDs) face issues such as reduced luminescent intensity when sulfur-based materials react with elements like molybdenum, silicon, or germanium, leading to weakened electron emissions and luminance saturation at high current densities.
Innovation Solution
A germanate luminescent material with a chemical formula of Zn2-2xGeO4:Mn2x, doped with nanoparticles of Ag, Au, Pt, or Cu, is developed, where x is between 0 and 0.05, and the molar ratio of these nanoparticles to the material is between 0 and 1×10−2, enhancing luminescent efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If oxide of sulfur is used as luminescent material in FED, then the material can be commercially available and easy to manufacture, but the luminescent intensity decreases due to reaction with cathode elements
Solution Approach 1:
The patent uses Zn2GeO4 as the host material combined with Mn2+ activator ions and metal nanoparticles (Ag, Au, Pt, Pd, or Cu) to create a composite luminescent material. This composite structure provides both high luminescent efficiency and stability, avoiding the chemical reaction problems of sulfur-based materials while maintaining ease of manufacture through conventional ceramic processing techniques.
Solution Approach 2:
The patent optimizes the doping concentration of Mn2+ ions (x in range 0.0005≦x≦0.02) and metal nanoparticles (y in range 1×10−5≦y≦5×10−3) to achieve maximum luminescent efficiency. By precisely controlling these compositional parameters, the material achieves high internal quantum efficiency without the harmful chemical reactions associated with sulfur-based materials.
2Adaptability or versatility
If sulfur-based luminescent material is used, then the material can be readily available, but electron emissions are weakened due to chemical reactions
Solution Approach 1:
The patent employs a composite structure of Zn2GeO4 host with Mn2+ activators and metal nanoparticle dopants. This composite material provides versatile luminescent properties and can be manufactured using standard ceramic processes, while the germanate composition avoids chemical reactions with cathode elements that would otherwise weaken electron emissions.
Solution Approach 2:
The patent uses metal nanoparticles (Ag, Au, Pt, Pd, or Cu) as dopants that can be introduced through simple colloid addition during ceramic processing. These nanoparticles provide enhanced luminescent efficiency and stability without requiring complex material synthesis, making the overall material both versatile and cost-effective to produce.
3Ease of manufacture
If conventional luminescent materials are used in FED, then the existing materials can be utilized, but luminance saturation occurs at high current densities
Solution Approach 1:
The patent changes the fundamental compositional parameters by using Zn2GeO4:Mn2x with metal nanoparticle dopants instead of conventional phosphors. The specific doping levels (x and y parameters) are optimized to achieve linear luminescence response at high current densities, preventing luminance saturation while maintaining compatibility with existing FED manufacturing processes.
Solution Approach 2:
The patent creates a composite luminescent material combining Zn2GeO4 host, Mn2+ activators, and metal nanoparticles. This composite structure provides superior luminescent performance with no luminance saturation at high current densities, while still being manufacturable using conventional ceramic techniques, thus bridging the gap between material performance and ease of manufacture.
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 germanate luminescent material exhibits increased internal quantum efficiency and luminescent intensity, maintaining brightness and stability even at high current densities, making it suitable for FEDs without luminance saturation.
Implementation Method 1
Metal nanoparticle M is doped in germanate host of the germanate luminescent material. The metal nanoparticle M increases internal quantum efficiency of the material, thus increasing its luminescent intensity.
Implementation Method 2
As a flat panel display technology, field emission display (FED) is of great potential. Operating voltage of FED is lower than that of the cathode ray tube (CRT)... the requirements for luminescent material of an FED of luminescent material is increasing, such as better chromaticity, higher luminescent efficiency at low voltage
Data Source
AI summary
The present invention provides a germanate luminescent material, a general molecular formula thereof being Zn2-2xGeO4:Mn2x,My, wherein M is selected from at least one of Ag, Au, Pt, Pd, and Cu metal nano particles; 0<x≦0.05; M is doped in Zn2-2xGeO4:Mn2x, and y is a molar ratio of M to Zn2-2xGeO4:Mn2x, 0<y≦1×10−2. The metal nano particle M is doped in a germanate luminescent substrate of the germanate luminescent material, and the metal nano particle M improves internal quantum efficiency of the luminescent material so that the germanate luminescent material has a high luminescent intensity. Also provided is a preparation method for the germanate luminescent material.