Sensitization of luminescence from Sm3+ ions in fluoride hosts K2YF5 and K2GdF5 by doping with Tb3+ions

VUV spectroscopy of lanthanide doped fluoride crystals K2YF5

“…In recent decades, the spectroscopy of lanthanide (Ln) ions doped oxide and fluoride crystals is an interesting research subject because of abundant applications of such materials [1][2][3][4][5]. In the comparison with oxide crystals, the fluoride crystals have been shown to have more advantages such as: (i) large band gap yielding the emission from the high energy levels of Ln ions; (ii) weak nephelauxetic effect and a moderate crystal-field strength generating the narrow emission bands as well as a long lifetime of excited levels within 4f electron configuration and (iii) low phonon energy leading to a high quantum efficiency of luminescence from some excited levels [6][7][8][9][10].…”

“…For these reasons, fluoride crystals doped with Ln ions are very suitable for solid-state lasers and optical amplifiers [7,8,10]. In particular, K2YF5:Ln 3+ single crystals have been widely studied because of their application abilities for lasers, light frequency converters [4,[11][12][13] and especially they have a great potential in the high energy dosimetry [14][15][16][17]. The structural studies have shown that K2YF5 crystals crystallize in the orthorhombic system with space group Pnam.…”

“…The structural studies have shown that K2YF5 crystals crystallize in the orthorhombic system with space group Pnam. In this system, there is only one type of sites for Y 3+ in which Y 3+ ion is surrounded by seven fluoride ions in a C2v local point symmetry [4,12]. The lattice parameters have been determined for this system to be a = 10.758 Å, b = 6.598 Å, c = 7.246 Å [4,11,18].…”

“…In this system, there is only one type of sites for Y 3+ in which Y 3+ ion is surrounded by seven fluoride ions in a C2v local point symmetry [4,12]. The lattice parameters have been determined for this system to be a = 10.758 Å, b = 6.598 Å, c = 7.246 Å [4,11,18]. In the K2YF5:Ln 3+ systems, the Ln 3+ ions substitute for the Y 3+ sites and so only one type of Ln 3+ luminescence centers can be expected in K2YF5:Ln 3+ crystals [18].…”

Investigation on the Thermoluminescence Properties of KGdF4:Sm3+ Polycrystalline

“…Recently, KLnF4 and K2LnF5 (Ln = Gd or Y) crystals doped with trivalent rare earths (e.g. Ce 3+ , Tb 3+ , Tm 3+ and Dy 3+ ions) have been shown to be promising materials for detecting and discriminating different types of radiation fields [1,2,[5][6][7][8][9]. It is known that the thermal neutron absorption cross-sections of 155 Gd and 157 Gd isotopes are 255,000 b and 61,000 b, respectively [2].…”