The dependence of the phosphor stability on the mechanical treatment

Multi-Photon Phosphor Feasibility Research

“…It is also a known fact that milling or any other disruptive mechanical treatment of a freshly synthesized polycrystalline material can introduce lattice distortions that result or assist in the generation of defects [66][67][68]. For the case of halophosphate , the brightness of luminescence decreases up to 20% (depending on the duration of grinding) with the dislocation density increasing from 10 8 to 10 10 cm -2 [69].…”

Quenching problems in inorganic luminescent materials

“…For a given luminophor the whole complex photochemical quenching process strongly depends on the external conditions such as irradiation intensity, temperature, and pressure as well as on the nature of the surrounding gas atmosphere [1,2]. Furthermore, on a large scale it is determined by the activator concentration [3] and the particle size [4] of the luminophors to be investigated. Examples of a few quite different luminescent materials, some experimental results, and their brief interpretation are given here.…”

“…The tube can be evacuated or filled with gases by means of a common pumping device as described in detail previously [1]. For measuring luminescent-optical properties the samples were removed from the tube and then put into spectrometers for investigating changes in emission or reflectance [1][2][3][4]. The phosphor sample material was prepared by solid-state reactions at high temperatures [1,3] or commercial products were used.…”