[Upconversion luminescence in Ho3+ doped fluoride thin film with excitation red laser].
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.
Xiao
Si-guo
SG
Physics Department, Xiangtan University, Xiangtan 411105, China.
Yang
Xiao-liang
XL
Liu
Zhen-wei
ZW
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
D005459:Fluorides; D006695:Holmium