Zinc Aluminate Core-Shell Luminescent Material for FED Stability
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Solution Overview
Problem
Conventional luminescent materials for field emission displays (FEDs) suffer from low luminous intensity due to instability, leading to weak electron emission and brightness saturation issues, particularly when sulfur-based materials react with cathode components like molybdenum and silicon.
Innovation Solution
A zinc aluminate luminescent material with a core-shell structure, where metal nanoparticles (Ag, Au, Pt, Pd, or Cu) serve as the core, Al2O3 as the inner shell, and Zn1-xAl2O4:A3+ as the outer shell, is developed, enhancing luminous intensity and stability through surface plasmon resonance and doping with Cr, Eu, or Ce.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If sulfur-based fluorescent materials are used for FED, then the luminous intensity is improved, but the stability deteriorates due to reaction with cathode components
Solution Approach 1:
The luminescent material is segmented into a core-shell structure where the unstable sulfur-based luminescent layer is separated from the reactive cathode components by a stable protective shell layer, allowing the luminous function to be maintained while preventing harmful reactions
Solution Approach 2:
A composite luminescent material structure is created combining sulfur-based luminescent compounds with stable protective materials (oxides, nitrides, or carbides of Si, Ge, or Sn) to form a core-shell composite that maintains both high luminous intensity and chemical stability against cathode reactions
2Ease of manufacture
If conventional luminescent materials are used, then the manufacturing process is simple, but the luminous intensity is low
Solution Approach 1:
The patent employs composite materials with a core-shell structure where the core contains conventional sulfur-based luminescent compounds and the shell contains stable protective materials, achieving enhanced luminous intensity while maintaining compatibility with existing manufacturing processes
Solution Approach 2:
The patent modifies the structural parameters of the luminescent material by introducing a core-shell architecture and controlling the thickness and composition of the shell layer, thereby enhancing luminous intensity without fundamentally changing the manufacturing approach
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 zinc aluminate luminescent material exhibits improved luminous intensity, stability, and environmental friendliness, suitable for display and lighting applications, with increased internal quantum efficiency and no toxic sulfide production.
Implementation Method 1
enhancing luminous intensity and stability through surface plasmon resonance
Data Source
AI summary
A zinc aluminate luminescent material is provided having the general molecular formula of Zn1-xAl2O4:A3+x@Al2O@My, wherein A is selected from the group consisting of Cr, Eu, Tb, and Ce; M is selected from at least one of Ag, Au, Pt, Pd and Cu metal nanoparticles; 0<x≤0.1; y is the ratio between the molar mass of M and the sum of the molar mass of Al in Zn1-xAl2O4:A3+x and the molar mass of Al in Al2O3@My, 0<y≤1 × 10-2; @ represents coating; the zinc aluminate luminescent material uses M as a core, Al2O3 as an inner shell, and Zn1-xAl2O4:A3+x as an outer shell. The zinc aluminate luminescent material is a core-shell structure using at least one of Ag, Au, Pt, Pd and Cu metal nanoparticles as a core, Al2O3 as an inner shell, and Zn1-xAl2O4:A3+x as an outer shell. The metallic nanoparticles improve the internal quantum efficiency, thus enabling the zinc aluminate luminescent material to have a relatively high luminous intensity. Moreover, a preparation method of the zinc aluminate luminescent material is also provided.