title: Synthesis and upconversion luminescence of BaY2F8:Yb3+/Er3+ nanobelts.
abstract: 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.
authors.affiliation: Department of Chemistry and State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, 100084, P. R. China.
authors.forename: Guofeng
authors.initials: G
authors.lastname: Wang
authors.forename: Qing
authors.initials: Q
authors.lastname: Peng
authors.forename: Yadong
authors.initials: Y
authors.lastname: Li