Studies on structural, photo and thermoluminescence properties of Sm3+ activated Ca3MgSi2O8 phosphors for solid-state lighting

The samarium activated orange–red-emitting calcium magnesium orthosilicates [Ca 3 MgSi 2 O 8 :xSm 3+ (CMSOSM)] phosphors with different concentration were synthesized by solid-state reaction method. The monoclinic crystal structure with P21/c space group was confirmed by the PXRD technique. Under the excitation at 405 nm, characteristics emission spectra of Sm 3+ ions in orange–red region were recorded at 565 nm, 570 nm, 602 nm, and 648 nm due to the transition of 4 G 5/2 → 6 H 5/2, 6 H 7/2, 6 H 9/2 respectively. The critical doping concentration of Sm 3+ ion was 2.0 mol% and the critical distance was determined as 32 Å. The energy transfer among Sm 3+ ions in Ca 3 MgSi 2 O 8 (CMSO) phosphors was found to be a dipole–quadrupole interaction. Furthermore, it’s exciting to find that the red-emitting phosphors showed high thermal stability. Ca 2.98 MgSi 2 O 8 :Sm 0.02 (CMSOSM2) exhibits a strong sharp peak at 104 °C was shoulder at 291 °C when heating rate (HTR) is constant 5 °Cs −1 . The shape of glow peak and intensity of isolated curve depend on dopant impurity rigorously, results in remarkable increasing in TL sensitivity. The photometric results indicate that the synthesized orange–red phosphor can be potentially applicable for solid-state lighting and display devices applications.