title: Upconverted photoluminescence in Ho3+ and Yb3+ codoped Gd2O3 nanocrystals with and without Li+ ions.
abstract: The upconversion photoluminescence of Ho(3+) ion sensitized by Yb(3+) ion in Ho(3+)/Yb(3+) codoped Gd(2)O(3) nanocrystals with and without Li(+) is investigated in this paper. Strong fluorescence in the green (534-570 nm) and red (635-674 nm) regions of the spectrum has been observed, arising from the (5)F(4)/(5)S(2) → (5)I(8) and (5)F(5) → (5)I(8) transitions of Ho(3+) ion, respectively. Yb(3+) ion is considered to be a better sensitizer for catching enough pumping energy and transferring considerable energy to Ho(3+) in the Ho(3+)/Yb(3+) system. The upconversion intensity emitted by Ho(3+) is greatly enhanced when Li(+) is added to the Ho(3+)/Yb(3+) codoped Gd(2)O(3) nanocrystals.
authors.affiliation: School of Physical Science and Technology, Soochow University, Suzhou, China.
authors.forename: Yutao
authors.initials: Y
authors.lastname: Jia
authors.forename: Yinglin
authors.initials: Y
authors.lastname: Song
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Bai
authors.forename: Yuxiao
authors.initials: Y
authors.lastname: Wang
mesh_terms: D004735:Energy Transfer; D005682:Gadolinium / Q000737:chemistry*; D006695:Holmium / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D008163:Luminescent Measurements; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D007477:Ions; C030581:gadolinium oxide; D008094:Lithium; D005682:Gadolinium; D015018:Ytterbium; D006695:Holmium