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8 January 2008 The multiphoton ultraviolet and visible upconversion luminescence of ZBLAN material
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Abstract
The multiphoton ultraviolet and visible upconversion luminescence of Tm3+Yb3+ codoped ZBLAN fluoride glass as excited by a 975nm diode laser was studied. Two typical ultraviolet 290.6nm 1I63H6 and 362.0nm 1D23H6 upconversion luminescence lines were found. The careful measurement of the variation of upconversion luminescence intensity F as a function of the 975nm pumping laser power P has proven that the 290.6nm 1I63H6 and 362.0nm 1D23H6 upconversion luminescences are a six-photon and a five-photon upconversion luminescence respectively. Several visible upconversion luminescence lines at 450.5nm, 473.9nm, 648.5nm, (687.3nm, 696.2nm) and (793.5nm, 800.7nm) were found also, which result from the fluorescence transitions of 1D23F4, 1G43H6, 1G43F4, 3F33H6 and 3H43H6 of Tm3+ ion respectively. It has been proved that the upconversion luminescence of 1G4 state is a three-photon upconversion process, while that of 3F3 or 3H4 state is a two-photon upconversion process. The theoretical analysis suggests that the upconversion mechanism of the 362.0nm 1D2 → Tm3+ upconversion luminescence is the cross energy transfer of {3H4(Tm3+) → 3F4(Tm3+), 1G4(Tm3+) → 1D2(Tm3+)} and {1G4(Tm3+) → 3F4(Tm3+), 3H4(Tm3+) → 1D2(Tm3+)} between Tm3+ ions, whereas the mechanism of the 290.6nm 1I63H6 upconversion luminescence is the sequential energy transfer of {2F5/2(Yb3+) → 2F7/2(Yb3+), 1D2(Tm3+) → 3P1(Tm3+)} and {2F5/2(Yb3+) → 2F7/2(Yb3+), 1D2(Tm3+) → 3P2(Tm3+)} from Yb3+ ions to Tm3+ ions. In addition, the upconversion luminescence of G4 and 3H4 state also results from the sequential energy transfer {2F5/2(Yb3+) → 2F7/2(Yb3+), 3H4(Tm3+) → 1G4(Tm3+)} and {2F5/2(Yb3+) → 2F7/2(Yb3+), 3F4(Tm3+) → 3F2(Tm3+)} from Yb3+ ions to Tm3+ ions respectively.
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Xiaobo Chen, Zengfu Song, Yafei Wang, Jun Xiong, Guojiian Yang, Song Li, Jing Zhou, Fanglin Peng, and Gu Zhou "The multiphoton ultraviolet and visible upconversion luminescence of ZBLAN material", Proc. SPIE 6837, Information Optics and Photonics Technologies II, 68370U (8 January 2008); https://doi.org/10.1117/12.754871
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