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Electron-beam irradiation effects on luminescence properties in subsurface regions of single-crystalline sapphires treated with and without hydrogen plasma exposures

“…Finally, we will discuss the Cr 3+ CL peak located at E1.8 eV, which is assigned to the luminescence at isolated Cr 3+ centers, with satellite peaks on both energy sides [17,18,[26][27][28][29]. There were obviously observed no irradiation-induced changes in either the peak locations or the peak widths in the SOS or SSS case.…”

“…Furthermore, other characteristic luminescence peaks observed at E4.5 and E1.8 eV are assigned as those originating from divalent impurities such as Ca 2+ and Mg 2+ ions [15] and from solute Cr 3+ , Ti 4+ and Fe 3+ ions [16] in sapphire, respectively. However, controversial assignments have been reported for these peaks as well [1,14,15,17,18].…”

Microstructural development of α alumina scales developed on FeCrAl alloys

“…Moreover it is clear that there are changes in luminescence within individual grains and the boundaries of luminescent layers sometimes occur within grains (grain 4 and grains to the right of this for example) rather than Cr and Ti for example. [20][21][22] Although such extrinsic variations could mimic the grain structure, these variations are more likely to correspond to intrinsic CL variation 6 that relates to crystal orientation or defect structure that may itself be orientation dependent. 23 Orientation dependence explains the CL variation in the luminescent layers that correspond to the grain structure.…”

“…Ti and Cr are recognised as CL activators in a alumina. 20,21 To our knowledge there are no data on the effect of Fe on CL in a alumina. However, Fe acts as a CL quenching element across a wide range of silicate, carbonate and oxide minerals in rocks.…”

Optical properties of Sc-doped Al2O3translucent ceramics for radiation measurements

“…In this work, we chose alumina oxide (Al 2 O 3 ) as the luminescent material to be investigated since it has been one of the most extensively studied materials. [8][9][10] Historically, in the 1950s, non-doped Al 2 O 3 was first suggested as a TSL material 11) but was unable to attract much attention owing to its low sensitivity. 12) Since then, researchers have attempted to dope Al 2 O 3 with various different elements, 11,13,14) such as carbon, 11,15,16) chromium, [8][9][10]17,18) titanium, 8,14,17) magnesium, 14,19) nickel, 9,11,14,17) and other transition elements, 14,20,21) in order to enhance its functionalities.…”