High energy-efficient UV lamps using nano-thin spectrally selective metallo-dielectric layers

Trojan Technologies生产的紫外线废水处理系统是非常有效和通用的光学手段，用于灭活细菌，病毒和寄生虫，如贾第鞭毛虫和隐孢子虫。**目前的商业系统更倾向于使用中压汞蒸气灯，因为宽带**紫外线发射已被证明是可取的，因为它减少了细菌的光再激活。然而，**中压灯在800-900℃的相对高温下工作，从而发出显着的**红外辐射，因此能量效率不高。**为了减轻这种能量损失并提高灯的效率，需要一种光学涂层，在**UV处理范围（200-320 nm）内传输，同时将红外发射反射回灯中。通过使用专门的金属介电涂层，可以提高灯的效率，其中超纳米薄银层和高带隙陶瓷介电层共同作用，最大限度地提高红外反射和紫外部分的透射。**这种结构的初步建模结果是相当有希望的，表明在**UV中具有高透射率，在红外中具有随波长增加而增加的宽带反射。因此，显著提高紫外线灯的能源效率被认为是潜在可行的。**该项目的目的是通过实验证明这些专门的**金属介电涂层用于节能紫外线灯的可行性，并因此将其整合到特洛伊**技术的紫外线废水处理系统产品线中。**_________***光再激活是由紫外线辐射引起的生物损伤的恢复，由于同时**或随后用波长较长的光进行处理。

Ultraviolet wastewater treatment systems, produced by Trojan Technologies, are very effective and versatile**optical means for the deactivation of bacteria, viruses, and parasites such as giardia and cryptosporidium.**Current commercial systems prefer the utilization of medium-pressure mecury-vapour lamps since broadband**UV emission has been shown to be desirable given that it reduces photoreactivation* of bacteria. However,**medium-pressure lamps operate at relatively high temperature of 800-900 deg C thereby emitting significant**infrared radiation, and thus are energetically inefficient.**In order to mitigate this energy loss and improve lamp efficiency, an optical coating that transmits in the**UV treatment range (200-320 nm) while reflecting the infrared emission back into the lamp is required. Lamp**efficiency can be improved by using specialized metallo-dielectric coatings wherein ultra-nano-thin Ag layers**and high bandgap ceramic dielectric layers together serve to maximize reflection in the infrared and**transmission in the UV part of the spectrum.**Preliminary modelling results of such structures are quite promising, suggesting high transmission in the**UV and broadband reflection that increases with wavelength in the infrared. Accordingly, significant**enhancement in UV lamp energy-efficiency is deemed potentially viable.**The objective of this project is to experimentally demonstrate the viability of these specialized**metallo-dielectric coatings to render energy-efficient UV lamps, and hence its integration in Trojan**Technologies' product line of UV wastewater treatment systems.**_________*** Photoreactivation is the recovery from biological damage caused by UV radiation as a result of simultaneous**or subsequent treatment with light of longer wavelength.