Photoluminescence properties of KSrPO4:Sm3+ phosphor for SSL applications

The orange light emitting KSr(1-x)PO4:xSm3+ (x = 0.001, 0.002, 0.005, 0.01 and 0.02) phosphors were successfully synthesized via solid-state diffusion method. The phase of the prepared KSrPO4:Sm3+ phosphor was confirmed by powder XRD analysis and studied its photoluminescence (PL) properties under ultraviolet (UV) excitation (300-450 nm). The XRD pattern of prepared KSrPO4:Sm3+ phosphor is well matched with available standard ICDD file having card no. 00-033-1045. The excitation and emission spectra of prepared phosphor were monitored at 598 and 402 nm respectively. The PL emission spectra of prepared KSrPO4:Sm phosphor consists of series of sharp lines peak at 559, 598, and 644 nm, to the corresponding to (4)G(5/2) -> H-6(5/2), (4)G(5/2) -> H-6(7/2) and (4)G(5/2) -> H-6(9/2) transitions of Sm3+ ion respectively. The optimum PL intensity is obtained at 0.005 mol of Sm3+ ion at 402 nm excitation. The CIE (Commission International de l'Eclairage) coordinates of prepared phosphor was calculated and found to x = 0.6177, y = 0.3817. Hence the KSrPO4:Sm has great potential in solid state lighting and light-emitting diode applications.