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Luminescence studies of the rare earth ions-doped CaF2 and MgF2 films for wavelength conversion

“…These differences are presumably due to the formation process of alkaline earth fluorides in sol-gel synthesis. It was studied that the decomposition of the alkaline earth and lanthanide trifluoroacetate gels by heating obeys following reactions [6][7][8]:…”

“…The optical characterization and sol-gel synthesis of porous alkaline earth and lanthanide fluoride films using the hydrofluoric acid (HF) [5] and the trifluoroacetic acid (TFA, CF 3 COOH) [6][7][8][9] have been studied. In the present study, the Eu and Yb ions-doped CaF 2 and MgF 2 films as the UV to visible conversion layer were prepared by the vacuum deposition and the sol-gel methods.…”

Chemical processing for inorganic fluoride and oxyfluoride materials having optical functions

“…Porous coatings are also effective to enhance the laser damage thresholds. We reported that the refractive index of sol-gelderived porous MgF 2 thin films could be controlled by the heat treatment conditions [22]. Fig.…”

“…Variation of the refractive index of the MgF 2 thin films obtained by drying at 80 8C and then heating at 300, 400 or 500 8C for 10 min.Reproduced from Ref. [22] by permission of Springer. sol-gel method using TFA [11].…”

Sol–gel Eu3+/Tm3+ doped transparent glass–ceramic waveguides

“…In another interesting approach metal fluorides have been obtained by using trifluoroacetic acetic acid as fluorine source in a sol-gel process. Thermal decomposition of the metal-trifluoroacetate complex species existing in solution leads to the metal fluorides [6][7][8].…”