Design, synthesis and luminescence properties of Ba2YB2O6Cl- and Ba2YB2O6F-based phosphors

Using a high-temperature solid-state reaction, the chlorine in Ba2YB2O6Cl is gradually replaced by F, and a new compound with the nominal chemical formula Ba2YB2O6F and two phosphors doped with Ce3+ and Eu3+, respectively, are obtained. X-Ray diffraction and photoluminescence spectroscopy are used to characterize the as-synthesized samples. The as-synthesized Ba2YB2O6Cl exhibits bright blue emission in the spectral range similar to 330-410nm with a maximum around 363nm under X-ray or UV excitation. Ba2YB2O6F:0.01Ce(3+) exhibits blue emission in the range similar to 340-570nm with a maximum around 383nm. Ba2YB2O6F:0.01Eu(3+) exhibits a predominantly D-5(0)-F-7(2) emission (similar to 610nm) and the relative intensities of the D-5(0)-F-7(0,1,2) emissions are tunable under different wavelength UV excitation. The luminescence behaviors of the two phosphors are explained simply in terms of the host composition and site occupancy probability of Ce3+ and Eu3+, respectively. The results indicate that these phosphors have potential application as a blue phosphor or as a red phosphor. Copyright (c) 2014 John Wiley & Sons, Ltd.