This work deals with the issue of dielectric barrier discharge (DBD) Xe excimer lamps comprising inorganic phosphors based on doped yttrium ortho-phosphate. It thereby focuses on the fundamental understanding of phosphor aging and degradation during lamp preparation and operation. To this end, the analysis of optical properties of aged and recovered lamp phosphors was done. It turned out that changes in the reflection spectra and peculiar luminescence in the deep-red occurring at around 300 nm excitaion, can be exploited for a deeper understanding of the observed degradation and aging processes. Al_2O_3 or MgO particle coatings on the basis of a photochemically driven process were developed and tested in order to decrease the extent of phosphor degradation.
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