Site-selective spectroscopy of Eu3+-doped orthorhombic lanthanum and monoclinic yttrium polyphosphates

Luminescent properties of Yb-doped monoclinic yttrium polyphosphates

“…This is in agreement with the investigations by Buijs and Blasse on Eu 3+ -doped monoclinic Gd(PO 3 ) 3 [22] and by us on Eu 3+ -doped Y(PO 3 ) 3 [23] in which it has been shown that the Eu 3+ ions occupy in majority sites without pure inversion symmetry.…”

“…In detail, in our recent study on the same phase Y(PO 3 ) 3 [23], four non-equivalent Eu 3+ sites are found. Two majority sites A and B, are assigned to sites without inversion symmetry, while two minority sites C and D are ascribed to the substitution on sites with inversion symmetry.…”

Luminescence spectroscopy and energy level location of lanthanide ions doped in La(PO3)3

“…and Tb 3 þ in La(PO 3 ) 3 and Y(PO 3 ) 3 as potential phosphors under VUV excitation have been discussed [2,7,8]. Much attention has been paid to the energy migration and transfer processes in Ln-based phosphate compounds [9][10][11].…”

“…Ln(PO 3 ) 3 (Ln¼ La to Gd) with a large radius of the Ln ion crystallizes in an orthorhombic structure with C222 1 space group, while those with small radius of Ln ion (Ln¼Gd to Lu and Y) crystallize in the monoclinic crystal structure with P2 1 /c space group [12,13]. Recently, it was shown that the coordination environment of cationic sites can influence the luminescent properties of lanthanide ions in the two Ln(PO 3 ) 3 phosphate structures [8,12]. In particular, La(PO 3 ) 3 with the orthorhombic crystal structure has only one La-site with eight fold coordination that is available for the trivalent lanthanide ion dopant.…”

Photoluminescence properties of Eu3+ in Y(PO3)3 under VUV excitation

“…Metaphosphates Ln(PO 3 ) 3 (Ln¼Y, La,y) attract our interesting because Ln 3+ ions in the crystal matrix isolate from each other for a big distance [3][4][5] and Ln(PO 3 ) 3 has the effective absorption and emission properties in the VUV region [6][7][8][9] and may be applied in the mercury-free fluorescent lamps. Y(PO 3 ) 3 is one kind of metaphosphates Ln(PO 3 ) 3 and can crystallize in a monoclinic crystal structure [4,5,10].…”