Multicolor orange, yellow, green, and blue upconversion luminescence was detected with excitation at 960 nm. Materiaalitekniikan diohjelma degree programme in materials science and engineering tekniikan ja luonnontieteiden tiedekunta faculty of engineering and natural sciences. The latter technique permitted the fabrication of perfectly vitreous optical fibers of. Moreover, relative research has indicated that spectra. Structure of nanocrystals in oxyfluoride glass ceramics. The formation of srf 2 nanocrystals in gcs has been confirmed by xray diffraction xrd and transmission electron microscopy. Transparent oxyfluoride glass ceramics volume 23 issue 11 matthew j.
Understanding enhanced upconversion luminescence in oxyfluoride glassceramics based on local structure characterizations and molecular dynamics simulations mohamed a. The optical absorption and luminescence of the rare earth ions were investigated. Transparent oxyfluoride glassceramics containing caf2 nano. Pbf 2 nanocrystals in oxyfluoride glass ceramics with different doping concentrations and thermal temperatures are prepared by a traditional meltquenching and thermal. Transparent oxyfluoride glassceramic films and selfsupported layers with composition. With controlled crystallisation of glasses by inhomogeneous nucleation and growth during reheating, pbf2 crystallites of nanometric size and a filling factor of 10.
Structural characterisation of transparent oxyfluoride glass. Transparent oxyfluoride glassceramics can provide a low phonon energy fluoride environment for active rare earth ions while maintaining the durability, formability, and mechanical strength of an oxide glass. Nanoparticles, glass ceramics, thermal induction and corrosion treatment introduction since wang and ohwaki 1 reported that transparent oxyfluoride glass ceramics gcs showed more efficient upconversion uc from infrared to visible than fluoride glass in 1993, many researchers have paid attention to oxyfluoride gcs. Transparent oxyfluoride tellurite glass with the composition of teo2sio2alf3caokf system were prepared by conventional melting and annealing technique, and the transparent oxyfluoride glass ceramics containing caf2 nanocrystallines were obtained by controlled heattreatment. The fabrication of nanoparticles in aqueous solution from. Cathodoluminescence cl spectra and decay times have been studied for oxyfluoride glasses and glass ceramics of the system. Novel oxyfluoride biophotonic glassceramics szczodra, agata 2019 tweet avaa tiedosto. Glass science, a section of the journal frontiers in materials received. Oxyfluoride borate glass containing bao as a cation modifier and 30% pbf 2 represents a good starting point for obtaining glass. Transparent oxyfluoride glass ceramics can provide a low phonon energy fluoride environment for active rare earth ions while maintaining the durability, formability, and mechanical strength of an oxide glass.
Remarkably enhanced green upconversion luminescence ucl. With controlled crystallisation of glasses by inhomogeneous nucleation and growth during reheating. Structural characterisation of transparent oxyfluoride. Corrosion treatment was used to remove the silicate glass matrix. Nickel ion doped transparent bulk glassceramics containing k2sif6, znf2, and kznf3 nanocrystals were elaborated to show the prospect that this novel group of oxyfluoride glassceramics is promising for. In recent years, rareearth ions doped transparent oxyfluoride glassceramics have attracted great attentions for their low phonon energy environments of fluoride nanocrystals and high chemical. Transparent glass ceramics containing nanocrystals were prepared by controlled heattreatment of conventionally meltquenched nafyf 3al 2 o 3sio 2 oxyfluoride glass. Under normal conditions, the compound is a colorless solid. The glass precursor was obtained by pouring the molten substance into a copper pan rapidly at room temperature. Introduction oxyfluoride glasses are well known for many years, but our interest in this kind of material has grown after the demonstration in the. Cathodoluminescence of terbium and ytterbiumactivated oxyfluoride glasses and glass ceramics. Transparent oxyfluoride glass ceramics sciencedirect. Osa ytterbiumdoped oxyfluoride nanoglassceramic fibers. Rareearth fluorescence in novel oxyfluoride glasses and.
Osa efficient green upconversion luminescence in highly. Erbium doped transparent glassceramics were obtained in the family 50geo2 50. This study investigated the effects of ceo 2 on structure and synthesis of boroaluminosilicate transparent glass ceramics containing caf 2 nanocrystals prepared through isothermal crystallization. Erbium doped transparent glassceramics were obtained in the family 50geo250. The phase separation process was studied by thermal analysis, xray diffraction and transmission electron. Ultratransparent glass ceramics activated with thulium ions were fabricated employing different heat treatments of precursor oxyfluoride glass. Moreover, relative research has indicated that spectra characters display minor. Transparent oxyfluoride tellurite glass with the composition of teo2sio2alf3caokf system were prepared by conventional melting and annealing technique, and the transparent oxyfluoride glass. Rare earth doped glasses are of great interest for their optical properties and their applications in the telecommunication field. Understanding enhanced upconversion luminescence in. Request pdf structure of nanocrystals in oxyfluoride glass ceramics the crystallization of fluorosilicate glasses obtained using highpurity sio2, alo1. Rareearth ions doped transparent oxyfluoride glassceramics. Since wang and ohwaki reported that transparent oxyfluoride glass ceramics gcs showed more efficient upconversion uc from infrared to visible than fluoride glass in 1993, many.
Oxyfluoride glass ceramics differ from the other inorganic oxyfluorides crystals, glasses, etc. The nanogcs thus obtained, albeit having very large crystallinity of. Transparent oxyfluoride nanoglass ceramics doped with pr3. The precipitated crystallites were composed of only cubic nayf 4 and the average diameter was estimated as less than 10 nm from the xray diffraction analysis. Pdf klaf4 nanocrystallisation in oxyfluoride glassceramics. In particular, oxyfluoride transparent glassceramics in which fluoride nanocrystals. Transparent oxyfluoride glassceramics containing caf2. Structural characterisation of transparent oxyfluoride glassceramics structural characterisation of transparent oxyfluoride glassceramics mortier, m patriarche, g. In particular, compositions based on oxide glass matrices with fluoride crystals embedded inside. Crackfree films and selfsupported layer with a maximum thickness up to 1. Oxyfluoride glassceramics for transition metal ion based.
This study investigated the effects of ceo 2 on structure and synthesis of boroaluminosilicate transparent glass ceramics containing caf 2 nanocrystals prepared through isothermal crystallization of the meltquenched glasses with composition 54sio 2 10b 2 o 3 al 2 o 3 14na 2 o3zno2li 2 o4caf 2 doped with 01. We also propose that the possible mechanism for oxyfluoride borate glass crystallization started with a separation of phases. Baf2 nanocrystals in the chemical composition of sio2baf2k2co3la2o3sb2o3 oxyfluoride glass systems have been prepared from melt. Request pdf design of oxyfluoride glassceramics containing nalaf4. Rare earth ions in fluorides and oxyfluoride glass ceramics summary of doctoral thesis submitted for the degree of doctor of physics subfield of solid state physics riga, 2017. The local structures of glasses and glass ceramics were characterized by advanced one and. Available formats pdf please select a format to send. Structural characterisation of transparent oxyfluoride glassceramics. Cathodoluminescence cl spectra and decay times have been studied for oxyfluoride glasses and. Yangyang guo, huidan zeng, bing yang, guorong chen, jianding chen, luyi sun. Oxyfluoride glass ceramics containing bayb x y 1x f 5 nanocrystals doped with 0. In order to improve the properties of glass, they are often crystallized.
Enhanced blue emission from transparent oxyfluoride glass. Fluorescence from re doped samples indicate substantial partitioning into the fluoride crystals. Frontiers transparent oxyfluoride nanoglass ceramics. Transparent solgel oxyfluoride glassceramics with high. The glass precursor was then annealed at 440 c for 8 h. Baf2 nanocrystals in the chemical composition of sio2baf2k2co3la2o3sb2o3 oxyfluoride glass systems have been prepared from melt quenching.
Sio 2 al 2 0 3 na 2 o laf 3 naf, activated by terbium and ytterbium. Spectral and structural properties 151 studies of ucl. Ultratransparent glassceramics activated with thulium ions were fabricated employing different heat treatments of precursor oxyfluoride glass. Nano express open access distribution of nd ions in. Upconversion luminescence in oxyfluoride glassceramics with. Transparent aluminosilicate oxyfluoride glass ceramics.
Structural analysis of oxyfluoride borate glass and baf2. Photoluminescence and structural characterization of re. Transparent glassceramics containing nanocrystals were prepared by controlled heattreatment of conventionally meltquenched nafyf 3al 2 o 3sio 2 oxyfluoride glass. The decomposition of crystalline hydrate of yttrium. Design of oxyfluoride glassceramics containing nalaf4 nano. Cathodoluminescence of terbium and ytterbiumactivated. Upconversion luminescence in oxyfluoride glassceramics.
Meltquenching is still the most used method to prepare these materials but solgel has been. Novel oxyfluoride glass and transparent glassceramics for. Oxyfluoride transparent glass ceramics request pdf. The number of publications about transparent glass ceramics, including oxyfluoride glass ceramics and certain trademarked materials, has steadily grown over last couple of decades, especially, after 2000. Authors contribution experimental measurements have been performed in the institute of solid tate physics, university of latvia lu s p.
Transparent oxyfluoride glass ceramics mrs bulletin. Introduction oxyfluoride glasses are well known for many years, but our interest in this kind of material has grown after the demonstration in the literature 1 of the possibility of obtaining the socalled rare earth containing ultratransparent glass ceramics. Transparent oxyfluoride glassceramics containing pbf2. Thepartial devitrificationofan oxyfluoride glassis the oldest andbest known method. This includes papers dedicated to pyroceram, vitroceram, sitall astrositall and others and indicates a sustained interest of modern researchers in oxyfluoride glass ceramics. There are three main methods for the synthesis of oxyfluoride glassceramics. Pdf transparent solgel oxyfluoride glassceramics with high. Klaf4 nanocrystallisation in oxyfluoride glassceramics article pdf available in crystengcomm 15. Frontiers transparent oxyfluoride nanoglass ceramics doped. The spectroscopic properties of the thulium ions, studied through uvvisnir absorption and luminescence. Crystallization kinetics of laf3 nanocrystals in an oxyfluoride glass.
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