稀土Tm^(3+)/Yb^(3+)共掺杂氟氧化物上转换可见发光

Upconversion Luminescence of Tm^(3+)/Yb^(3+) in Fluoride-oxide

制备了稀土Tm3+/Yb3+共掺杂氟氧化物上转换发光材料(60TeO2-10A lF3-10PbF2-10NaF-2Tm2O3-8Yb2O3),在980nm红外光泵浦激发下,测量了样品的吸收谱、上转换荧光发射谱和上转换发光强度与激光泵浦功率的对数关系。观察到峰值为477nm蓝光和651nm红光可见发射,分别是稀土Tm3+的激发态1G4→3H6,1G4→3F4跃迁;在806nm附近,观察到较强的红外发射(3H4→3H6),分析了稀土Tm3+/Yb3+共掺杂氟氧化物上转换可见发射机制,证实了稀土Tm3+上转换发射是在稀土Yb3+的敏化作用下,通过能量传递(ET)和激发态吸收(ESA),实现了激发态1G4向基态3H6、激发态3F4跃迁的三光子吸收过程和激发态3H4→3H6的双光子吸收过程。

Study on upconversion luminescence of rare-earth ions have made great progress, blue and green visible band and ultraviolet band upconversion emission of rare-earth ions co-doped in multi-hosts （fluoride ,oxide or fluoride-oxide）had been observed. These multi-hosts may serve as the main candidate material for shot-wavelength lasers and semiconductor luminescence. Tm^3 ＋/Yb^3＋ co-doped in fluorideoxide are synthesized from TeO2, AlF3, PbF2, NaF, Tm2O3 and Yb2O3. Reagents are mixed and heated to 200℃ for lh then at 800℃ for 30min in muffle stove. Absorption spectrum and upconversion fluorescence emission spectrum of Tm^3＋ /Yb^3＋ in fluoride-oxide （ 60TeO2-10AlF3 -10PbF2-10 NaF-2Tm2O3 -8 Yb2O3 ）, and upconversion luminescence intensity versus LD pump power are measured. This paper analyzed the characters of 4felectron transition, and suggested that central wavelength of upconversion luminescence of Tm^3 ＋ co-doped in fluoride-oxide is 477,651 nm and 806nm are excited under 980nm LD excitation. Three photons step by step are illustrated. absorption： ^1G4→^3H6,^1G4→^3F4 and two photons step by step absorption ： ^3 H4→^3H6 are illustrated.