Transparent Ceramic Light Emitting Device with Plasmonic Metal Layer
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Solution Overview
Problem
Transparent ceramic materials used in field emission devices exhibit low luminescent efficiency, which limits their performance in applications such as illumination and display.
Innovation Solution
A luminescent device comprising a transparent ceramic substrate with a metal layer of irregularly arranged nano-particles, specifically Y2O3:Eu, where the metal layer is formed from materials like gold, silver, or aluminum, and annealed in a vacuum to enhance surface plasmon effects, increasing internal quantum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If transparent ceramic is used as luminescent substrate in field emission device, then mechanical strength and chemical stability are improved, but luminescent efficiency deteriorates
Solution Approach 1:
The patent applies local quality by depositing metal layers (such as aluminum, silver, or gold) specifically on the surface of the transparent ceramic substrate. This creates a localized plasmonic structure that enhances the electromagnetic field at the surface, thereby improving luminescent efficiency only where needed (at the emission interface) without changing the bulk mechanical properties of the ceramic substrate. The metal layer thickness is controlled at 5-50 nm to optimize the plasmonic effect while maintaining structural integrity.
Solution Approach 2:
The patent creates a composite structure by combining transparent ceramic substrate with metal layers. This composite material system leverages the mechanical strength and chemical stability of the ceramic while adding the plasmonic properties of the metal to enhance luminescent efficiency. The composite structure allows simultaneous achievement of structural robustness and optical performance enhancement.
2Loss of energy
If metal layer is deposited on luminescent substrate to enhance surface plasmon effect, then luminescent efficiency is improved, but device complexity increases
Solution Approach 1:
The patent optimizes luminescent efficiency by carefully controlling parameters of the metal layer: thickness (5-50 nm), material composition (aluminum, silver, or gold), and deposition methods (sputtering, evaporation, or chemical deposition). By adjusting these parameters, the plasmonic enhancement is maximized while keeping the added structural complexity minimal. The simple layered structure avoids complex geometries or additional components.
3Ease of manufacture
If conventional transparent ceramic is used, then manufacturing simplicity is maintained, but luminescent efficiency remains low
Solution Approach 1:
The patent applies preliminary action by depositing the metal layer on the transparent ceramic substrate before final device assembly. This allows the plasmonic enhancement structure to be prepared in advance, simplifying the overall manufacturing process. The metal layer deposition can be performed using standard thin-film techniques, and the enhanced substrate is then ready for integration into the field emission device without additional complex processing steps.
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 surface plasmon effect significantly enhances the spontaneous emission of the luminescent substrate, leading to improved luminescent efficiency and uniform light emission, addressing the low efficiency issue while simplifying the manufacturing process.
Implementation Method 1
by disposing a metal layer having a metal microstructure on the luminescent substrate, surface plasmon is produced at the interface between the luminescent substrate and the metal layer disposed thereon under cathode ray. Due to the surface plasmon effect, the internal quantum efficiency of the luminescent substrate is significantly increased, i.e. the spontaneous emission of transparent ceramic is enhanced
Data Source
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AI summary
A light emitting device and a manufacturing method thereof are provided. The light emitting device (10) comprises a light emitting substrate (13) and a metal layer (14) having irregularly arranged nano-particles structure formed on a surface of the light emitting substrate (13), wherein the material of the light emitting substrate (13) is a transparent ceramic (13) comprised of Y2O3:Eu. By disposing the metal layer having the irregularly arranged nano-particles structure on the light emitting substrate, surface Plasmon is formed on the interface between the cathode ray and the light emitting substrate, to greatly increase the light efficiency.