Synthesis and luminescence spectroscopy of YNbO4 doped with Eu(III)

Abstract

The solid compound YNbO4:Eu3+ was synthesized by an usual solid state reaction and a non-conventional method of thermal decomposition of precursors. X-ray diffraction data of the monoclinic YNbO4 were used to identify the crystalline M-fergusonite phase. The symmetry of the luminescent Eu3+ site is very close to the D2 point symmetry. Spectroscopic quantities, namely, the 5D0-7F0/5D0-7F2 intensity ratio, the 5D0-7F1 transition splitting (DE0-1) and the intensity parameters Wl (l = 2, 4) were obtained from the emission spectrum at 77 K. In this sequence their values are 4.0 10-3, 103 cm-1, 18.0 10-20 cm2 and 3.2 10-20 cm2. Theoretical predictions are discussed in terms of the simple overlap model (SOM). The yttrium niobate structural data were taken as basis to obtain the spherical coordinates of the ligand oxygen atoms. The Eu-O distances being corrected in the frame of rare earth niobate series vs. atomic number. Their predicted values are 3.9 10-3, 85 cm-1, 14.9 10-20 cm2 and 3.0 10-20 cm2, assuming 0.9 as the effective charge of the ligand ions and their polarizabilities relative to the metal-ligand (M-L) distance as follows [R(Å)/ a(Å3)]: 2.443/0.6, 2.427/1.2, 2.370/2.3, 2.349/3.5

Broadband downconversion based near-infrared quantum cutting via cooperative energy transfer in YNbO4:Bi3+, Yb3+ phosphor

“…So, it is expected that the doping concentration of the RE ions can be high. The photoluminescence properties of YNbO 4 activated by RE ions such as Eu 3+ , Dy 3+ , Sm 3+ , and Er 3+ [26,27] have been reported.…”

Matrix-induced synthesis and photoluminescence of M2RENbO6: Eu3+ (M=Ca, Sr, Ba; RE = Y, Gd, La) phosphors by hybrid precursors

“…Representative examples are YVO 4 : Eu 3+ and Y 2 O 3 : Eu 3+ powder phosphors which have been playing a commercial role in the production of luminescent lamps and X-ray intensifying screens [12][13][14]. The syntheses of conventional rare earth phosphors mainly focus on the high-temperature solid-state reactions providing agglomerated powders, which can permit to easily change the structural characteristics of the powders [15,16]. Recently, the development of new methods for the preparation of micron or submicron or nano phosphors may increase the possibilities for high effective rare earth phosphors [17][18][19][20][21][22].…”

Vanadate Phosphors for Energy Efficient Lighting

“…The high chemical and thermal property of vanadate makes its preparation diffi cult. The preparations of phosphors mainly focus on the high-temperature solid-state reactions providing agglomerated powders, which can change the structural characteristics of the powders [30,14,15,[36][37][38]. Recently, the development of new methods for the synthesis of micro or nano phosphors may increase the probability for high effective rare-earth phosphors [39][40][41][42][43][44][45][46][47][48].…”