Oxyfluoride Transparent Glass Ceramics

Functionalized Inorganic Fluorides Synthesis, Characterization Properties of NanostructuredSolids Edited by Alain Tressaud 2010 John Wiley Sons, Ltd 

In this chapter, we describe different transparent oxyfluoride systems doped with lanthanide ions. We examine the conditions that can lead to a perfectly controlled crystallization process and also the conditions that insure an efficient segregation of the rare-earth ions inside crystallites. Finally, we discuss the optical properties of glass-ceramics, in terms of absorption, emission and lifetimes. We establish a comparison between their optical properties and those of glasses and single-crystals. 

There are three main methods for the synthesis of oxyfluoride glass-ceramics  

The last two methods, based on a soft chemistry approach, have two main advantages over the glass devitrification  

---

Oxyfluoride Transparent Glass Ceramics 275 9.2.1 Synthesis by Glass Devitrification... 

M, J, Dejneka, Transparent oxyfluoride glass ceramics, MRS Butt., 23, 57-62 (1998),... 

F. l.ahoz, S.E. Hernandez, N.E. CapuJ and D. Navarro-Urrios, Optical amplification in Ho -doped transparent oxyfluoride glass ceramics at 750 nm, Appl. Phys. Lett. 90, 201117 (2007)... 

D.Q. Chen, Y.S. Wang, etc., Crystallization and fluorescence properties of Nd -doped transparent oxyfluoride glass ceramics, T. Materials Science and Engineering B, 123,1-6 (2005). 

Composition and Properties of Some Transparent Oxyfluoride Glass-Ceramics (Tick et al., 1995)... 

Dejneka M.J., "The Luminescence and Structure of Novel Transparent Oxyfluoride Glass-Ceramics,"/. Non-Cryst. Solids, 239, 149—55 (1998a). 

Dejneka M.J., "Transparent Oxyfluoride Glass-Ceramics," Mater. Res. Bull., 23 [11] 57-62 (1998b). 

Dejneka M.J. The luminescence and structure of novel transparent oxyfluoride glass-ceramics. J. Non-Cryst. Solids 1998 239 149-155... 

Lifetime measurements were, for instance, performed on transparent oxyfluoride glass-ceramics with Pr + LaF3 crystallites, doped with different concentrations [59]. When the Ln concentration increases from 0.01 % to 1 %, the decay time is drastically shortened (Figure 9.21), as a result of Ln " "—Ln interactions. There is a tradeoff in the lifetime... 

M. Mortier, G. Patriarche, Structural characterisation of transparent oxyfluoride glass-ceramics, J. Mater. Sc. 35, 4849-4856 (2000). 

V. K. Tikhomirov, D. Fumiss, A. B. Seddon, I. M. Reaney, M. Beggiora, M. Ferrari, M. Montagna, R. RoUi, Fabrication and characterization of nanoscale, Er -doped, ultra-transparent oxyfluoride glass ceramics, Appl. Phys. Lett. 81,1937-1939 (2002). 

G. Dantelle, M. Mortier, D. Vivien, G. Patriarche, Effect of CeFs on the nulceation and up-conversion luminescence in transparent oxyfluoride glass-ceramics, Chem. Mater. 17, 2216-2222 (2005). 

J. Qui, A. Makishima, Y. Kawamoto, Efficient blue up-conversion luminescence of Tm " " in transparent oxyfluoride glass ceramics containing Cdi xPb,F2 nanocrystals, J. Phys. Cond. Matter 41, 13827-13834(2002). 

J. Mendez-Ramos, V. Lavin, I. R. Martin, U. R. Rodriguez-Mendoza, V. D. Rodriguez, A. D. Lozamo-Gorrin, P. Nunez, Role of the Eu ions in the formation of transparent oxyfluoride glass ceramics J. Appl. Phys. 89, 5307-5310 (2001). 

Nanocomposite is an ideal structure of metal fluoride nanocrystals for viable optical applications. The idea originates from designing oxyfluoride glass ceramics where nanometer-scale metal fluoride crystals are dispersed in glass matrices of high transparency. Wang and Ohwaki attempted to prepare transparent oxyfluoride glass ceramics based on... 

---