BaY(2)F(8):Yb(3+)/Er(3+) nanobelts were prepared with oleic acid as capping ligand. Under 980 nm excitation, the (2)H(9/2)→(4)I(15/2), (4)F(7/2)→(4)I(15/2), (2)H(11/2)→(4)I(15/2), (4)S(3/2)→(4)I(15/2), and (4)F(9/2)→(4)I(15/2) transitions were observed. The intensity ratio of (2)H(11/2)/(4)S(3/2)→(4)I(15/2) to (4)F(9/2)→(4)I(15/2) and (2)H(11/2)→(4)I(15/2) to (4)S(3/2)→(4)I(15/2) increased with increasing excitation power.
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Wang et al. (2010) studied this question.
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