The luminescence properties of Sm2+ doped sodium barium strontium phosphate

Luminescence emission from metastable Sm2+defects in Y PO4:Ce,Sm

“…(vi) 5 D 1 → 7 F 1 : very weak line at 1.769 eV; this is only a tentative assignment, but the thermal dependence of the transition described in section 3.3 provides added evidence that this is the case. These assignments for Sm 2+ are supported by the similarity of the 1.84 eV energy position of the 5 D 0 → 7 F 0 transition assumed here in YPO 4 , with those established for other compounds: 1.81 eV in NaMgF 3 and 1.82 eV in KMgF 3 (Gâcon et al 1981); 1.823 eV in BaBPO 5 (Huang et al 2008b); 1.800 eV in CaSO 4 (Lapraz et al 2007); 1.784 eV in CaF 2 (Kaiser et al 1961) and at 1.808 eV in KSrPO 4 (Huang et al 2008a).…”

Radiation-Induced Effects and Valence Changes of Samarium Ions in Sr[sub 3]Sm(PO[sub 4])[sub 3]

“…25,28 However, in the disordered structure of NaSm 0.01 Ba 0.78 Sr 0.21 ͑PO 4 ͒, the emission of Sm 2+ shows 5 D 0 → 7 F J ͑J = 0, 1, 2͒ emission together with the broad 5d → 4f emission band at room temperature, while only the 5 D 0 → 7 F J ͑J = 0, 1, 2͒ emission is observed at lower temperature. 29 In Sr 3 Sm͑PO 4 ͒ 3 :Sm 2+ , this phenomenon might be associated with the lowering of point symmetry or a heavily disturbed crystalline environment of the cations ͑Sm 3+ and Sm 2+ ͒. Hoogendorp et al reported the luminescent properties of Ce 3+ -activated M 3 La͑PO 4 ͒ 3 :Ce 3+ ͑M = Sr, Ba͒ under UV excitation.…”

Effects of changing the M2+ cation on the crystal structure and optical properties of divalent samarium-doped MAl2Si2O8 (M = Ca, Sr, Ba)

“…The intensity of 5 D 0 -7 F 0 transition is much higher than that of 5 D 0 -7 F 1 , which is strong evidence that Sm 2+ ions mainly occupy the lattice site without inversion symmetry. 9 From the crystal structure and the skeleton construction of MASO (Fig. 5), we can see that only in the Sm-doped H-BASO sample, Sm occupy the centered site with six identity oxygens (O 2 ), which is inversion symmetry, so the intensity of 5 D 0 -7 F 1 transition of Sm 2+ in H-BASO is the strongest among the four samples.…”

“…Under irradiation with UV to blue light, it can be excited into the 4f 5 5d 1 continuum, from which the ions rapidly relax to the lowest excited state. [9][10][11][12][13] Just as the Eu 2+ or Ce 3+ ions, the f-d luminescence wavelength of phosphors employing Sm 2+ changes greatly with the type of the host crystal. 2 shows the excitation and emission spectra of Sm doped CASO, SASO, M-BASO and H-BASO samples at room temperature with the initial samarium concentration of 5 mol%.…”

“…Emission (nm) f-f transition ( 5 D 0 / 7 F J ) As is well known, the relative intensity of f-f transitions is inuenced by the crystalline environment due to the different symmetry of the occupied sites. 9,10,[27][28][29][30] The crystal structure of MASO (M ¼ Ca and Ba) has been shown in Fig. 5.…”