Search results for "phosphosilicate"
showing 4 items of 4 documents
Luminescence of phosphorus containing oxide materials: Crystalline SiO2‐P and 3P2O5⋅7SiO2; CaO⋅P2O5; SrO⋅P2O5 glasses
2014
Luminescence of phosphate glasses such as CaO⋅P2O5 and SrO⋅P2O5 is compared with that of phosphorus doped crystalline α-quartz and phosphosilicate glass with content 3P2O5⋅7SiO2. Water & OH groups are found by IR spectra in these materials. The spectrum of luminescence contains many bands in the range 1.5 - 5.5 eV. The luminescence bands in UV range at 4.5-5 eV are similar in those materials. Decay duration in exponential approximation manifests a time constant about 37 ns. Also a component in μs range was detected. PL band of μs component is shifted to low energy with respect to that of ∼37 ns component. This shift is about 0.6 eV. It is explained as singlet-triplet splitting of excited st…
UV and yellow luminescence in phosphorus doped crystalline and glassy silicon dioxide
2015
Abstract Luminescence of phosphorus doped crystalline α-quartz and phosphosilicate glass with content 3P2O5·7SiO2 was studied. Water and OH groups are found by IR spectra in these materials. The spectrum of luminescence contains many bands in the range 1.5–5.5 eV. The luminescence bands in UV range at 4.5–5 eV are similar in those materials. Decay duration in exponential approximation manifests a time constant about 37 ns. Also a component in µs range was detected. PL band of µs component is shifted to low energy with respect to that of ~37 ns component. This shift is about 0.6 eV. It is explained as singlet–triplet splitting of excited state. Below 14 K increase of luminescence kinetics du…
Il management dell’ipersensibilità dentinale: dalla ricerca alla clinica
2014
Obiettivi. Scopo di questo lavoro è presentare le più recenti acquisizioni in tema di epidemiologia, diagnosi, eziopatogenesi e management clinico dell’ipersensibilità dentinale. Vengono inoltre descritti i prodotti disponibili per il suo trattamento e gli studi sperimentali e clinici condotti per valutarne l’efficacia. Materiali e metodi. Attraverso la banca dati Medline/Pubmed sono stati selezionati i lavori originali, le revisioni della letteratura e le linee guida pubblicate in lingua inglese e in italiano sull’argomento dal 2009 al 2013. Altre fonti sono state selezionate dai riferimenti bibliografici individuati. Risultati e conclusioni. Il management dell’ipersensibilità prevede il c…
Radiation Response of Ce-Codoped Germanosilicate and Phosphosilicate Optical Fibers
2016
We report an experimental investigation on the effects of Ce-codoping in determining the radiation response of germanosilicate and phosphosilicate Optical Fibers (OFs) in the UV-Visible domain and up to doses of $1~\hbox{MGy}({\rm SiO}_{2})$ . We show that the addition of Ce strongly impacts the Radiation Induced Attenuation (RIA) of both types of fibers. In the first case the radiation induced losses increase, whereas in the second one decrease. By combining the online RIA measurements with the Electron Paramagnetic Resonance (EPR) ones, we are able to infer the basic microscopic mechanisms taking place under irradiation, which involve the cerium codopant and some of the known Ge-related o…