Abstract
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 −614nm, corresponding to 5D0–7F2 (614nm) red emission andweak 5D0–7F1 (593nm) orange emission. The excitation spectra monitored at 614nm show broad band from 250 to 350nm ascribed to O–Eu charge-transfer (CTB) transition and the other peaks in the range of 350–410nm originated from f–f transitions of Eu3+ ions. The strongest band at 394nm 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 (350–410nm) emission of UV LED. For the excitation wavelength of 394nm 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:Eu3+by this method shows CIE colour coordinates of (0.62,0.34) with good intensity.
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