Luminescence properties of Eu3+ ions in K2YF5 crystals

Judd–Ofelt analysis of spectroscopic properties of Sm3+ ions in K2YF5 crystal

“…The bonding parameter (ı) is defined as ı = 1 −¯ /¯ × 100 [10], where¯= ( ˇ)/n and ˇ (nephelauxetic ratio) = c / a , c and a are energies of the corresponding transitions in the complex and aqua-ion [11], respectively, and n refers to the number of levels that are used to compute¯values. The bonding parameter depends on the environmental field; ı can be received the positive or negative value indicating covalent or ionic bonding.…”

“…Recently there are many reports on optical properties of the materials, such as the K 2 YF 5 :Nd 3+ , K 2 YF 5 :Pr 3+ , K 2 YF 5 :Tm 3+ , K 2 GdF 5 :Tb 3+ , and K 2 GdF 5 :Dy 3+ crystals [1][2][3][5][6][7]. The authors have investigated the optical properties of these materials by using optically stimulated luminescence (OSL) [8], thermoluminescence [9], frequency upconversion fluorescence [3], site-selective laser-excitation spectroscopy [10]. It is noted that K 2 YF 5 phases crystallize in orthorhombic system, each Y 3+ ion is surrounded by seven fluoride ions forming a C 2v local point symmetry.…”

Transparent glass–ceramics with (Eu3+,Yb3+):YNbO4 nanocrystals: Crystallization, structure, optical spectroscopy and cooperative upconversion

“…It is used in commercial blue phosphors, such as BaMgAl 10 O 17 [11]. Various dielectric hosts in the form of nano-powders [12][13][14][15][16], films [17][18][19], crystals [20][21][22], glasses [23][24][25][26][27] and glass-ceramics (GCs) [28][29][30][31][32][33][34][35][36][37] were studied for Eu-doping to improve the emission efficiency, as well as to tune the color properties; and the list is ever growing.…”

Luminescence properties and crystallographic sites for Eu3+ ions in fluorthalenite Y3Si3O10F

“…In particular Eu 3+ has a simple multiplet pattern of its energy level and each Eu 3+ center with different crystal-field symmetry possesses a unique optical transition in the 7 F 0 ? 5 D 0 excitation spectrum [17] which makes this ion suited as a local structure probe [18,19].…”