Structural and optical characterizations of sol–gel based composites constituted of LiGdF4 : Eu3+ nanocrystallites dispersed into a silica matrix

Ultraviolet-to-visible downconversion luminescence in solgel oxyfluoride glass ceramics containing Eu^3+:GdF_3 nanocrystals

“…In the literature there are many publications on the preparation of codoped Eu/Gd systems (e.g., LiGdF 4 , GdF 3 , NaGdF 4 , CsGd 2 F 7 , BaF 2 , BaGd 2 ZnO 5 ), in which GdF 3 crystals were fabricated by melt quenching, microemulsion, or coprecipitation methods [1][2][3][4][5][6][7][8][9][10][11][14][15][16][17]. To the best of our knowledge only a few reports are available on the solgel synthesis of crystals; for example, LiGdF 4 , GdOF [1,2,11,12], and GdF 3 in silica films [15].…”

“…Materials mentioned above could be obtained by a solgel method. Preparation at room temperature makes it easy to include inorganic and organic additives [11][12][13]. Lanthanide trifluorides, as an inorganic dopant, are very suitable for luminescent applications due to their optical properties and low phonon energies, reducing the probability of nonradiative transition and therefore leading to an increase of luminescence efficiency [8].…”

Long-lived emission from Eu3+:PbF2 nanocrystals distributed into sol–gel silica glass

“…, some of them are concentrated on the sol-gel synthesis and preparation of europium doped fluoride nanocrystals (e.g. NaYF 4 , CaF 2 , BaF 2 , LaF 3 , YF 3 , LiGdF 4 ) using heat treatment process [11][12][13][14][15][16]. To the best of our knowledge, only a few works are available on the Ln 3?…”

Chemical processing for inorganic fluoride and oxyfluoride materials having optical functions

“…For example, a silicon alkoxide (typically tetramethylorthosilicate and tetraethylorthosilicate) solution is mixed with trifluoroacetate solutions in preparing SiO 2 -based oxyfluoride glass-ceramics and nanocomposite powders [8,9,21]. Additional factors are concerned such as compositions, pH values and types of catalysts for the formation of SiO 2 .…”

“…This mechanism is explained by a two-step energy transfer when exciting Gd 3+ ions in their 6 G J high energy level. The sol-gel process was also utilized for preparing SiO 2 / LiGdF 4 :Eu 3+ nanocomposite powders [21]. Crystallization of the fluoride phase occurred after the heat treatment at 700 8C under inert atmosphere.…”