Initial study about cross-energy-transfer and fluorescence guard-against-forge in oxyfluoride vitroceramics

This paper studies the steady state luminescent behavior of Yb3+ Er3+ codop ed and Er3+ mono-doped oxyfluoride vitrocesamic materials. The cross-energy -transfer effect between Yb3+ and Er3+ ions in oxyfluoride vitroceramics(FO V), oxyfluoride glass(FOG) and fluoride glass(ZBLAN) materials have been st udied carefully also. Some new luminescence phenomenon is found, as describ ed in the following. When the (4)G(11/2) level of Er-doped FOV is excited b y 377 nm ultraviolet light,there appear a very strong green S-4(3/2)-->I-4( 15/2) fluorescence and a middle strong red F-4(9/2)-->I-4(15/2) fluorescenc e. However, when the (4)G(11/2) level of ErYb-codoped FOV is excited by 377 nm ultraviolet light,the red F-4(9/2)-->I-4(15/2) fluorescence is increase d about ten times, and meanwhile the green S-4(3/2)-->I-4(15/2) fluorescenc e is decreased about 100 times. The variation of the red-green light ratio is about 1000 times. This interesting phenomenon exists only in FOV but not in FOG and ZBLAN. This paper also discuss how to apply this effect to the Fluorescence Guard-Against-Forge in practice.