Vibration and Luminescence Spectroscopic Investigations of the Alkali Rare Earth Double Phosphates M₃(RE,Eu)(PO₄)₂(M=K, Rb; RE=La, Gd)

Abstract

The room temperature IR-and Daman spectra of the different M3RE(PO4)2 (M = K, Rb; RE = La, Eu, Gd) double phosphates were analysed and used to interpret the vibronic side band structure in the photoluminescence spectra. The intraconfigurational 4f-4f electronic transitions in the photoluminescence spectra of the Eu3+ doped M3 RE(PO4)2 were analysed in detail. The crystal field fine structure of the 5D0 -> 71',1 (J = 0-4) transitions was analysed accounting for the information on the crystal structure. The effect of the temperature as well as the alkali host cation was evaluated. Finally, a preliminary crystal field energy level scheme for the 7Fj (J = 0-4) ground term was deduced from the analysis of the photoluminescence as well as IR-and Raman spectra.

Optical and thermal characterization of microcrystalline Na3RE(PO4)2:Yb orthophosphates synthesized by Pechini method (RE= Y, La, Gd)

“…For this reason 54 bands should be expected, both in the IR and Raman spectra of Na 3 Y(PO 4 Table 3 together with their assignment to the respective unit cell modes. The Raman spectra are not presented because they are obscured by the strong Yb 3+ luminescence.…”

“…Lanthanide phosphates were extensively studied due to their wide use as optical materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. They exhibit good chemical and thermal stability and structural diversity.…”

“…The SEM images of Na 3 RE(PO4 ) 2 doped with Yb 3+ ions sintered at different temperature are shown in Figs 1-3. At 700 °C the powders are built of the particles of 200-250 nm in size.…”

Properties of ytterbium and neodymium doped alkali metal yttrium double phosphates of the M3Y1−Ln (PO4)2 type

“…The structural and spectroscopic properties of the alkali metal lanthanide double phosphates, M 3 Y(PO 4 ) 2 , doped with different lanthanide ions have been subject to considerable interest already for a long time [1][2][3][4][5][6][7][8][9][10][11]. These double phosphates have their host absorption edge at a rather short wavelength, and are thus suitable as host lattices for various luminescent materials including laser devices.…”

Synthesis and Crystal Structure of LiCe(PO3)4

“…[1][2][3] From a structural point of view, these materials can be classified as two types: I-A cyclic structure, in which the polyphosphate anion exists in a ring of four PO4 tetrahedra linked by bridging oxygens. II-A chain structure, in which the four PO4 tetrahedra form an elongated chain.…”