Photoluminescence properties of KSrPO₄:Sm³⁺ phosphor for SSL applications

The orange light emitting KSr_(1−x)PO_4: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 ⁴G_5/2 → ⁶H_5/2, ⁴G_5/2 → ⁶H_7/2 and ⁴G_5/2 → ⁶H_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.