氟氧化物玻璃陶瓷中交叉能量传递与荧光防伪的初步研究

研究了Yb³⁺Er³⁺共掺和Er³⁺单掺氟氧化物玻璃陶瓷材 料的稳态发光行为，对氟氧化物玻璃陶瓷(FOV)，氟氧化物玻璃(FOG)和氟化物玻璃(ZBLAN) 中Yb³⁺Er³⁺的交叉能量传递效应也进行了细致的研究.发现在377nm 紫外光激发⁴G_11/2能级的情况下，由于Yb³⁺对Er ³⁺的交叉能量传递，仅在 关键词： 交叉能量传递 氟氧化物玻璃陶瓷 荧光防伪

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+ codoped and Er³⁺ mono-doped oxyfluoride vitroceramic mater ials.The cross-energy-transfer effect between Yb³⁺ and Er³⁺ ions in oxyfluoride vitroceramics(FOV)，oxyfluoride glass(FOG) and fluoride gl ass(ZBLAN) materials have been studied carefully also.Some new luminescence phen omenon is found,as described in the following.When the⁴G_11/2 level of Er-doped FOV is excited by 377nm ultraviolet light，there appear a very strong green ⁴S_3/2→⁴I_15/2 fluo rescence and a middle strong red ⁴Ｆ_9/2→⁴I_15/2 fluorescence.However, when the ⁴G_11/2 level of ErYb-codoped FOV is excited by 377nm ultraviolet light，the red⁴Ｆ9/2→⁴I_15/2 fluorescence is increased about ten t imes, and meanwhile the green ⁴S_3/2→⁴I_{15/ 2} fluorescence 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 th e Fluorescence Guard-Against-Forge in practice.