Luminescence properties of red emitting phosphor NaSrBO3:Eu3+ prepared with novel combustion synthesis method

The red emitting phosphor NaSrBO3:Eu3+ is synthesised by simple, time saving, economically modified method of solution combustion synthesis at comparatively lower temperature using urea as fuel. X-ray power diffraction (XRD) analysis confirmed the formation of the said phosphor. Photoluminescence measurements showed that the phosphor exhibited emission peak with good intensity at -614 nm, corresponding to D-5(0)-F-7(2) (614 nm) red emission andweak D-5(0)-F-7(1) (593 nm) orange emission. The excitation spectra monitored at 614 nm show broad band from 250 to 350 nm ascribed to O-Eu charge-transfer (CTB) transition and the other peaks in the range of 350-410 nm originated from f-f transitions of Eu3+ ions. The strongest band at 394 nm can be assigned to F-7(0)-L-5(6) transition of Eu3+ ions due to the typical f-f transitions within Eu3+ of 4f(6) configuration. The latter lies in near ultraviolet (350-410 nm) emission of UV LED. For the excitation wavelength of 394 nm the emission intensity increases initially with the increase of Eu3+ concentration and reaches to the maximum at x=0.09.The concentration quenching observed after that is mainly due to quadrupole-quadrupole interaction. The as synthesised phosphor NaSrBO3:Eu(3+)by this method shows CIE colour coordinates of (0.62,0.34) with good intensity. (c) 2013 Elsevier B.V. All rights reserved.