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- W2083445500 abstract "Abstract The up-conversion luminescence properties of trivalent-rare-earth ion-doped orthotantalates are studied under 980 nm laser diode excitation. The results indicate that YTaO 4 :Tm 3+ /Yb 3+ emits blue and strong infrared emissions respectively corresponding to 1 G 4 → 3 H 6 and 3 H 4 → 3 H 6 transitions of Tm 3+ ions, while YTaO 4 :Er 3+ /Yb 3+ produces strong green and weak red emissions, resulting from 2 H 11/2 / 4 S 3/2 → 4 I 15/2 and 4 F 9/2 → 4 I 15/2 transitions of Er 3+ ions, respectively. In contrast to three excellent up-conversion phosphors, viz. NaYF 4 :Er 3+ /Yb 3+ , Y 2 O 2 S:Er 3+ /Yb 3+ and Y 2 O 3 :Er 3+ , YTaO 4 :Er 3+ /Yb 3+ shows not only strong green emission, but also larger intensity ratio of green to red emission. In addition, it is found that LaTaO 4 : Er 3+ /Yb 3+ shows the minimum quenching concentration of Yb 3+ and weakest up-conversion emission intensity, and the main peak presents blue shift (8 nm/556 nm) as compared with YTaO 4 :Er 3+ /Yb 3+ and GdTaO 4 :Er 3+ /Yb 3+ . The distinct luminescent characteristics of LaTaO 4 : Er 3+ /Yb 3+ can be attributed to the larger difference of radius between doped ion and La 3+ ion." @default.
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- W2083445500 date "2008-06-01" @default.
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- W2083445500 title "Up-conversion luminescence of trivalent-rare-earth ion-doped LnTaO4 (Ln=Y, Gd, La)" @default.
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- W2083445500 doi "https://doi.org/10.1016/j.matlet.2007.12.031" @default.
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