Abstract
MWO4 host matrices (M: Sr, Ba) doped with different Tm3+ concentrations (0.02, 0.04, 0.06, 0.08 and 0.10 mol%) have been successfully prepared by the coprecipitation method at room temperature. The as-prepared nanophosphors were characterized by infrared spectroscopy showing intense absorption bands in the range of 700-1000 cm-1 attributed to the symmetrical and asymmetrical stretching vibrations (ν) of the tetrahedral [WO4]2- group. The X-ray diffraction (XRD) measurements reveal the tetragonal scheelite phase with the I41/a (No. 88) space group. The emission spectra of the MWO4:Tm3+ materials are dominated by the highest intensity narrow band of the intraconfigurational 1D2 → 3F4 transitions in the blue region (ca. 456 nm) arising from the Tm3+ ions. Additional low-intensity emission bands originated from the 1G4 → 3H6 (ca. 475 nm), 1G4 → 3F4 (660 nm) and 3H4 → 3H6 (700 nm) transitions are also observed. These optical results indicate that the materials can be used as an alternative to blue-emitting markers.
Highlights
In the last decades, inorganic host lattices doped with trivalent rare-earth ions (RE3+) have been extensively studied due to the remarkable optical properties resulting from their 4f-4f transitions
We report the synthesis of luminescent MWO4:Tm3+ (M: Ba, Sr) nanomaterials prepared by the coprecipitation route and their photonic properties
No additional diffraction peaks in the X-ray powder diffraction (XPD) patterns originating from Tm2(WO4)[3] or any other phase were observed, which indicates that the as-prepared materials are a unique phase, indicating an efficient synthesis of the MWO4:Tm3+ phosphors
Summary
Inorganic host lattices doped with trivalent rare-earth ions (RE3+) have been extensively studied due to the remarkable optical properties resulting from their 4f-4f transitions. Since the CaWO4 matrix presents excellent chemical, thermal and luminescence properties, it has been extensively used in solid-state lasers, displays, scintillating materials, fiber-optical communication, etc.[8,9,10,11] For example, CaWO4 matrix shows an intense broad emission band in the spectral range of 300-600 nm with a maximum at around 420 nm, exhibiting a blue-emission color assigned to the O2−(2p) → W6+ ligand-to-metal charge transfer (LMCT) transitions from the [WO4]2– groups under UV excitation.[10,12,13] the excitation energy of the doped MWO4:RE3+ (M: Mg, Ca, Sr or Ba) may be efficiently transferred to RE3+ ions.[10,12,13]
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