Abstract
Ultraviolet B radiation (UVB) is widely used in agricultural plant growth and phototherapy. The traditional light sources have a low UVB radiation efficiency, poor uniformity radiation, high energy consumption, and short service lifetime. The multiband XeBr* and XeCl* planar excilamps as high-power UVB sources have not been researched in existing studies and the power density of XeBr*/XeCl* excilamps reported in the study are not high. This work presents a high-power density planar excilamp of homogeneous dielectric barrier discharge in a mixture of xenon and molecular bromine and chlorine (Xe/Br2/Cl2). The spectrum, electrical parameters, total gas pressure, and gas mixture composition, have been analyzed. For the multiband excilamp filled with Xe/Br2/Cl2, it has been demonstrated that the maximum UVB and total radiant efficiency is 7.9% and 9.7% with optimal chlorine ratio of 0.1% and the bromine ratio ranging from 0.1 to 0.2%, with the input power of 138 W at the total pressure of gas mixture of 200 mbar. This work has confirmed that the percentage of bromine molecules must be higher than the percentage of chlorine by a factor of about 2.6 to achieve the same intensities of the XeBr* 282 nm and XeCl* 308 nm bands. These results allow to find out the optimum radiation efficiency of multiband excilamps with a large planar geometry to meet the requirement of UVB industrial applications.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (Grant NO. 11505031).
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Conceptualization, SDZ, QYH, and QWZ; methodology, SDZ, QYH, and QWZ; investigation, QWZ; resources, SDZ; software, QWZ; data curation, QWZ; writing—original draft preparation, QWZ; writing—review and editing, SDZ and QYH; supervision, SDZ, QYH; project administration, QYH and SDZ; funding acquisition, SDZ and QYH All authors have read and agreed to the published version of the manuscript.
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Zhu, Q., Han, Q. & Zhang, S. The Ultraviolet-B Radiation Characteristics of Planar Excilamps Filled with Gas Mixture of Xenon, Bromine and Chlorine. Plasma Chem Plasma Process 44, 523–546 (2024). https://doi.org/10.1007/s11090-023-10428-6
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DOI: https://doi.org/10.1007/s11090-023-10428-6