Sc-Doped YPO4 UV Target for Stable Electron-Beam Emission
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Solution Overview
Problem
Conventional ultraviolet light sources, such as mercury xenon lamps, have low emission efficiency, large size, stability issues, and environmental concerns, and existing electron beam-excited sources rely on Sc:Al2O3 as the light emitting material, which limits wavelength selectivity and power consumption efficiency.
Innovation Solution
An ultraviolet light generation target using a YPO4 crystal with added scandium (Sc) as the light emitting material, manufactured through a process involving a mixture of yttrium oxide, scandium oxide, phosphoric acid, and a liquid, followed by evaporation and firing, to enhance emission intensity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional ultraviolet light sources such as mercury xenon lamps are used, then ultraviolet light can be generated, but emission efficiency is low and size is large
Solution Approach 1:
The patent changes the material parameter from conventional mercury xenon lamp fillings to a solid state YPO4 crystal doped with scandium and bismuth. This parameter change enables direct conversion of electron beam energy to ultraviolet light through cathodoluminescence, dramatically improving emission efficiency while reducing the overall device size by eliminating the need for large vacuum chambers and gas fillings required by conventional lamps.
Solution Approach 2:
The invention replaces the mechanical/gas-based ultraviolet generation system (mercury xenon lamp with electrical discharge through gas) with a solid state crystal system. The YPO4 crystal directly converts electron beam energy to ultraviolet photons through luminescence, substituting the complex gas discharge mechanism with a simpler solid state physical process, thereby improving efficiency and reducing size.
2Reliability
If conventional ultraviolet light sources are used, then ultraviolet light can be generated, but stability and life-span are poor
Solution Approach 1:
The patent employs a solid state YPO4 crystal that is inherently more durable than conventional gas-filled lamp components. The crystal can withstand repeated electron beam irradiation without degradation, providing long-term stable operation. The solid state structure eliminates fragile components such as glass envelopes, gas seals, and filament assemblies, resulting in a system with extended life-span and improved reliability.
3Object-generated harmful factors
If mercury xenon lamp is used, then ultraviolet light can be generated, but mercury affects the environment
Solution Approach 1:
The patent eliminates mercury entirely by replacing the mercury-based discharge mechanism with a solid state YPO4 crystal doped with non-toxic scandium and bismuth activators. This substitution converts a harmful environmental system into an environmentally benign one, as the solid state crystal contains no hazardous materials. The crystal can be disposed of without environmental concern, and the device operates without risk of mercury leakage or contamination.
4Adaptability or versatility
If Sc:Al2O3 is used as light emitting material, then ultraviolet light can be generated, but wavelength selectivity and power consumption efficiency are limited
Solution Approach 1:
The patent uses a composite material system consisting of YPO4 crystal doped with multiple activators (scandium and bismuth) in specific ratios. This composite structure enables simultaneous optimization of wavelength selectivity and power consumption efficiency. The YPO4 host lattice provides structural stability and luminescence properties, while the scandium and bismuth dopants create specific energy levels that emit at desired ultraviolet wavelengths with high quantum efficiency, addressing both limitations of conventional Sc:Al2O3.
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 YPO4 crystal with Sc addition provides a high emission intensity ultraviolet light source with improved stability and wavelength selectivity, offering a viable alternative to Sc:Al2O3, with increased efficiency and reduced environmental impact.
Implementation Method 1
a light emitting portion containing a YPO4 crystal to which at least scandium (Sc) is added, and for receiving an electron beam to generate ultraviolet light
Implementation Method 2
a second step of evaporating the liquid
Data Source
AI summary
An ultraviolet light generation target includes a light emitting layer. The light emitting layer contains a YPO4 crystal to which at least scandium (Sc) is added, and receives an electron beam to generate ultraviolet light. Further, a method of manufacturing the ultraviolet light generation target includes a first step of preparing a mixture containing yttrium (Y) oxide, Sc oxide, phosphoric acid, and a liquid, a second step of evaporating the liquid, and a third step of firing the mixture.