Liquid Metal Wavelength Converter Mounting for Phosphor Cooling
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Solution Overview
Problem
The existing technologies struggle to efficiently remove elemental mercury (Hg0) from flue gas and oxidized mercury (Hg2+) from waste liquid, with activated carbon injection technology being costly and its mercury removal efficiency is affected by NOx and SO2.
Innovation Solution
Utilization of metal sulfides (e.g., FeS2, CuS, CuFeS2) as mercury removal adsorbents, which contact with flue gas and waste liquid, adsorbing and converting Hg0 from flue gas and Hg2+ from waste liquid into stable mercury sulfide compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the phosphor layer is bonded to the heat dissipating substrate via metal bonding material, then the phosphor cooling efficiency is improved, but thermal stress causes damage to the phosphor layer or delamination
Solution Approach 1:
The patent introduces a liquid metal layer as an intermediary substance between the phosphor layer and the heat dissipating substrate. This liquid metal mediator provides both thermal conduction for cooling and compliance to accommodate thermal expansion differences, preventing stress concentration that would cause phosphor layer damage or delamination.
Solution Approach 2:
The patent changes the physical state of the bonding material from solid (metal bonding material) to liquid (liquid metal). This parameter change allows the bonding material to maintain good thermal contact while accommodating thermal expansion differences through its fluidity, thus preventing thermal stress damage.
2Productivity
If the phosphor layer is cooled efficiently, then fluorescence conversion efficiency increases, but thermal stress from expansion differences causes delamination
Solution Approach 1:
The liquid metal serves as a mediator that simultaneously achieves efficient heat transfer to maintain high fluorescence conversion efficiency and provides mechanical compliance to maintain bonding stability despite thermal expansion differences between layers.
3Manufacturing precision
If a rigid bonding material is used to secure the phosphor layer, then positioning precision is improved, but thermal stress causes damage and delamination
Solution Approach 1:
The patent changes the bonding material from rigid solid to liquid state, allowing it to conform to surface irregularities for precise positioning while accommodating thermal stress through its fluidity, preventing damage and delamination.
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
Achieves efficient, cost-effective, and environmentally friendly simultaneous removal of Hg0 from flue gas and Hg2+ from waste liquid, avoiding secondary pollution and reducing operational costs.
Implementation Method 1
a liquid metal disposed between the base and the wavelength converter
Implementation Method 2
a wavelength converter configured to convert first light having a first wavelength band into second light having a second wavelength band different from the first wavelength band
Data Source
AI summary
A wavelength conversion apparatus includes a base having a first surface, a wavelength converter disposed at a first surface side of the base and configured to convert first light having a first wavelength band into second light having a second wavelength band different from the first wavelength band, the wavelength converter including a light exiting surface which is provided at the side opposite from the base and via which the second light exits, a liquid metal disposed between the base and the wavelength converter, and a first restrictor holding the wavelength converter at the base and restricting a position of the wavelength converter in a first direction along a normal to the light exiting surface.