Preparation and Photoluminescence of Sm 3+ Doped YAlO 3 Phosphor

Abstract

YAlO3: Sm(3+) phosphor has been synthesized by the solid state reaction method with calcium flouride used as a flux. The resulting YAlO3: Sm(3+) phosphor was characterized by X-ray diffraction (XRD) technique, Fourier transmission infrared spectroscopy (FTIR), photoluminescence . . PL excitation spectrum was found at 254,332,380,400,407, 603 and 713 nm. Under excitation of UV(713 nm) YAlO3: Sm(3+) (0-3 %) broad band emission were observed from 400 to 790 nm with a maximum around 713 nm of YAlO3 host lattice accompanied by weak emission of Sm(3+) ((4)G5/2 - (6)H5/2, (6)H7/2,(6)H9/2) transitions. The results of the XRD show that obtained YAlO3: Sm(3+) phosphor has a orthorhombic structure. The study suggested that Sm(3+) doped phosphors are potential luminescence material for laser diode pumping and inorganic scintillators.

Structural and optical properties of beta irradiated YAlO3 single crystals

“…5c) at 562, 566, 571, 576 nm; 602, 605, 610, 618 nm; 643, 648, 652, 661, 667 nm; and 701, 705, 711, 717 nm. These multiplet emission lines confirm the presence of unintentionally doped Sm 3+ impurities in the YAP lattice [26]. Note that the Sm 3+ ions with 4 F5 configuration undergoes several intra-shell transitions which emit sharp multiplet lines in the red-orange region at about 566, 605, 648 and 705 nm corresponding to the transition from excited level 4G5/2 to ground levels H5/2,6H7/2,6H9/2 and 6H11/2 respectively, as shown in Fig.…”

“…5d. Also, the PL excitation bands at about 320 nm can be attributed to the parity allowed 4f-5d transitions of Sm 3+ in YAP lattice [26]. The unintentional Sm 3+ and Cr 3+ impurities are originated from the starting materials, Y2O3 and Al2O3, respectively.…”