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 5D0–7F2 (614 nm) red emission andweak 5D0–7F1 (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 7F0–5L6 transition of Eu3+ ions due to the typical f–f transitions within Eu3+ of 4f6 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.