Luminescence properties of calcium tungstate activated by lanthanide(Ⅲ) ions
来源期刊：JOURNAL OF RARE EARTHS2014年第3期
论文作者：Z.Piskula K.Staninski S.Lis
文章页码：221 - 225
摘 要：Calcium tungstate phosphors activated by the Ln3+ ions（Ln=Pr, Nd, Tb, Yb） were synthesized by a traditional high-temperature solid-state method. The crystal structures and morphologies of the products were characterized by scanning electron microscopy（SEM）, X-ray powders diffraction（XRD） and infrared spectra（FT-IR）. The samples were found to show luminescence properties（down-conversion, DC, at excitation wavelength 254 nm and up-conversion, UC, at excitation wavelength 980 nm）. CaWO4 doped with Tb3+/Yb3+ showed green DC and UC luminescence characteristic of Tb（III） ion in the range of 470–660 nm, corresponding to the 5D4→7F6,5,4,3,2 electronic transition. CaWO4 doped with Pr3+/Yb3+ showed week blue, green and red（DC and UC） luminescence of Pr（III） ion, in the wavelength region of 450–700 nm. Emission peaks were ascribed to the 3P1→3H4,5,6, 3P0→3H4,5,6, 3P1→3F2 and 3P0→3F2 transitions, respectively. CaWO4 doped with Nd3+/Yb3+ phosphor emitted orange UC luminescence at 450–690 nm（2P3/2→4I15/2, 4G7/2→4I9/2,11/2,13/2） and strong near-infrared UC luminescence at 720–900 nm（4F7/2+4S3/2→4I9/2, 4F5/2+2H3/2→4I9/2, 4F3/2→4I9/2） which is the characteristic of Nd（III） ion.
Z.Piskula1，K.Staninski1，S.Lis1
1. Faculty of Chemistry, Adam Mickiewicz University
摘 要：Calcium tungstate phosphors activated by the Ln3+ ions（Ln=Pr, Nd, Tb, Yb） were synthesized by a traditional high-temperature solid-state method. The crystal structures and morphologies of the products were characterized by scanning electron microscopy（SEM）, X-ray powders diffraction（XRD） and infrared spectra（FT-IR）. The samples were found to show luminescence properties（down-conversion, DC, at excitation wavelength 254 nm and up-conversion, UC, at excitation wavelength 980 nm）. CaWO4 doped with Tb3+/Yb3+ showed green DC and UC luminescence characteristic of Tb（III） ion in the range of 470–660 nm, corresponding to the 5D4→7F6,5,4,3,2 electronic transition. CaWO4 doped with Pr3+/Yb3+ showed week blue, green and red（DC and UC） luminescence of Pr（III） ion, in the wavelength region of 450–700 nm. Emission peaks were ascribed to the 3P1→3H4,5,6, 3P0→3H4,5,6, 3P1→3F2 and 3P0→3F2 transitions, respectively. CaWO4 doped with Nd3+/Yb3+ phosphor emitted orange UC luminescence at 450–690 nm（2P3/2→4I15/2, 4G7/2→4I9/2,11/2,13/2） and strong near-infrared UC luminescence at 720–900 nm（4F7/2+4S3/2→4I9/2, 4F5/2+2H3/2→4I9/2, 4F3/2→4I9/2） which is the characteristic of Nd（III） ion.
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