Two-step synthetic route towards monodisperse vernier yttrium oxyfluoride with multicolour fluorescence

摘要

A two-step synthetic route (Y-2(OH)(5)Cl center dot 1.5H(2)O - Y(OH)(x)F3-x - Y6O5F8) was designed to prepare monodisperse orthorhombic (YOF8)-O-6-F-5 (denoted as V-YOF) for the first time. In this approach, Y-2(OH)(5)Cl center dot 1.5H(2)O was employed as precursor to synthesize Y(OH)(x)F3-x via the ion exchange reaction. The morphologies, structures and photoluminescence properties of samples were investigated by XRD, SEM, FT-IR, EDS and PL spectra. Under ultraviolet light excitation, the V-YOF: Ln(3+) (Ln = Eu, Tb) phosphors show strong light emissions with different colors for different doping ions. Moreover, by co-doping the Tb3+ and Eu3+ into V-YOF host, multicolor tunable emissions are obtained due to the energy transfer from Tb3+ to Eu3+ (a dipole-dipole interaction mechanism). And by the calculation, the energy transfer efficiency of V-YOF:0.05Tb(3+), xEu(3+) can reach up to 61.24% when the concentration of the Eu3+ is 0.05. The fluorescence lifetime at this condition is 1.00 ms. These features manifest this material may have potential applications for field-emission displays. (C) 2017 Elsevier B.V. All rights reserved.