Study on synthesis, optimization and concentration quenching mechanism of deep-blue-emitting BaNa(B3O5)3:Eu2+ phosphor

A series of deep-blue Ba(1-x)Na(B3O5)(3):xEu(2+) (x=0.06, 0.07, 0.08, 0.09, 0.10) phosphors have been synthesized by solid state reaction method. The crystal structure and photoluminescence properties were investigated by X-ray diffraction (XRD), photoluminescence excitation (PLE) and photoluminescence emission (PL) spectra. The photoluminescence properties of BaNa(B3O5)(3):Eu2+ phosphor were optimized by varying the doping concentration of Eu2+ ions, and the concentration quenching mechanism was studied in detail. Also the color purity and color stability of Ba(1-x)Na(B3O5)(3):xEu(2+) phosphors were evaluated by calculating the CIE chromaticity coordinates. The BaNa(B3O5)(3):Eu2+ phosphor shows a broad excitation band ranging from 200 to 380 nm when monitored at 405 nm and a strong deep-blue emission band peaked at 405 nm when excited at 285 or 310nm. The optimal concentration of Eu2+ in BaNa(B3O5)(3):Eu2+ phosphor is about 7.0 mol%. The concentration quenching mechanism of Eu2+ in the BaNa(B3O5)(3) host was verified to be quadrupole-quadrupole interaction. The chromaticity coordinates of Ba0.93Na(B3O5)(3): 0.07Eu(2+) is located in the deep-blue light region and Ba(1-x)Na(B3O5)(3):xEu(2+) phosphors show high color purity and good color stability. All the results indicate that BaNa(B3O5)(3): Eu2+ could act as a good deep-blue phosphor. (C) 2017 Elsevier GmbH. All rights reserved.