title: [Upconversion luminescence in Ho3+ doped fluoride thin film with excitation red laser].
abstract: Ho3+ doped fluoride thin film was deposited on common glass matrix by low energy pulse laser (532 nm, quadratic harmonics of Nd: YAG laser). Red and green upconversion luminescences with central wavelength of 770 and 540 nm have been observed through Japan R-500 spectrometer with excitation of 632.8 nm He-Ne laser. These upconverted emissions are ascribed to transitions of 5S2-->5I7, 5F4-->5I7 and 5S2-->5I8 and they are realized by two step absorption of Ho3+ ions and energy transfer among Ho3+ ions.
authors.affiliation: Physics Department, Xiangtan University, Xiangtan 411105, China.
authors.forename: Si-guo
authors.initials: SG
authors.lastname: Xiao
authors.forename: Xiao-liang
authors.initials: XL
authors.lastname: Yang
authors.forename: Zhen-wei
authors.initials: ZW
authors.lastname: Liu
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004735:Energy Transfer; D005459:Fluorides / Q000737:chemistry*; D005898:Glass / Q000737:chemistry; D006695:Holmium / Q000737:chemistry*; D007834:Lasers; D049449:Luminescence; D013050:Spectrometry, Fluorescence
chemical_list: D005459:Fluorides; D006695:Holmium