16 April 2018 Cathodoluminescent UV-radiation sources
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Proceedings Volume 10614, International Conference on Atomic and Molecular Pulsed Lasers XIII; 106141F (2018) https://doi.org/10.1117/12.2303579
Event: XIII International Conference on Atomic and Molecular Pulsed Lasers, 2017, Tomsk, Russia
Abstract
Mercury-free UV-radiation sources are described. An electron beam similar to cathode-ray tubes (CRT) excites a luminescent material in a vacuum bulb. A high density of excitation requires the cathode and the luminescent material to be resistant for that and provide the extended lifetime of the UV-radiation source. Carbon fibre and nano-carbon based field-emission cathodes produce long lasting stable emission with a high current density (up to 0.3-0.5 A/cm2 ). Li2B4O7:Cu and Li2B4O7:Ag luminescent ceramics survive under high radiation doses and provide UV luminescence bands peaked at 360-370 nm and 270 nm, respectively. The luminescence band at 360-370 nm has a good overlap with the fundamental absorption edge of TiO2, which is known as a photo-catalyst in air and water cleaning systems. The luminescence band at 270 nm overlaps with DNA absorption and provides a direct disinfection effect. We suggest the structure of complex luminescence centres and energy transfer mechanisms. The electron structure of lithium tetraborate and the contribution of impurities are also discussed in paper.
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N. Yu. Vereschagina, N. Yu. Vereschagina, M. I. Danilkin, M. I. Danilkin, M. A. Kazaryan, M. A. Kazaryan, D. I. Ozol, D. I. Ozol, E. P. Sheshin, E. P. Sheshin, D. A. Spassky, D. A. Spassky, } "Cathodoluminescent UV-radiation sources", Proc. SPIE 10614, International Conference on Atomic and Molecular Pulsed Lasers XIII, 106141F (16 April 2018); doi: 10.1117/12.2303579; https://doi.org/10.1117/12.2303579
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