Irradiation-induced valence conversion of samarium ions in Na2SO4
Rahman, AMS; Cao XZ(曹兴忠); Wei L(魏龙); Cao, XZ; Wei, L; Wang, BY; Yu, RS; Chen, ZB; An, GP; Sidike, A; Wang BY(王宝义); Yu RS(于润升); Chen ZB(陈志比); An GP(安广鹏)
AbstractNa2SO4: Sm phosphors were synthesized by heating pure sodium sulphate with a small amount of SmF3 at 950 degrees C. X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements show that the particle size of as-synthesized phosphors is 58 and 60 nm, respectively. The samples were irradiated by Co-60 gamma-rays with irradiation doses of 10-50 kGy at room temperature and by electrons with a total fluence of 6.7 x 10(16) e/cm(2) at a flux of 7.8 x 10(11) e/cm(2).sec. After exposure to gamma-ray and high energy electron irradiations, as-synthesized phosphors show the conversion of Sm3+ -> Sm2+. The photoluminescence (PL) spectra of as-synthesized, gamma-ray, and electron-irradiated phosphors obtained under 375 nm excitation consist of narrow emission bands with peaks at 563, 598, 644, and 704 nm, assigned to the (4)G(5/2) -> H-6(J) (J = 5/2, 7/2, 9/2, and 11/2) transitions within 4f(5) electronic configuration of Sm3+. The PL spectra of irradiated phosphors under 570 nm excitation at room temperature consist of a broad band with a peak at 695 nm and an emission line at 685.9 nm on the broad band. The broad band is assigned to the 4f (5)5d -> 4f 6 (7FJ) transition and the emission line to the D-5(0). F-7(0) transition within Sm2+. The PL and photoexcitation (PE) spectra at 10 K were well assigned to energy levels of Sm2+. Annealing at 473 K (200 degrees C) completely erased the Sm2+ emission band within the detection limit at room temperature.
Subject AreaMaterials Science; Physics
Indexed BySCI ; ADS
WOS IDWOS:000319064800036
ADS Bibcode2013ApPhA.111..587R
ADS URLhttps://ui.adsabs.harvard.edu/abs/2013ApPhA.111..587R
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2013ApPhA.111..587R/citations
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Cited Times:6 [ADS]
Document Type期刊论文
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Rahman, AMS,Cao XZ,Wei L,et al. Irradiation-induced valence conversion of samarium ions in Na2SO4[J]. APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING,2013,111(2):587-591.
APA Rahman, AMS.,曹兴忠.,魏龙.,Cao, XZ.,Wei, L.,...&安广鹏.(2013).Irradiation-induced valence conversion of samarium ions in Na2SO4.APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING,111(2),587-591.
MLA Rahman, AMS,et al."Irradiation-induced valence conversion of samarium ions in Na2SO4".APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 111.2(2013):587-591.
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