TAILIEUCHUNG - Structure and Physico-Chemical properties of silica gels doped with optically activated Er3+ ions by Sol-Gel process

This paper is devoted to the study of the relationship between structure and optical properties of silica glasses doped with optically active Er3+ ions and reported the influence of the suitably selected heat treatment on the optical properties of silica glasses. The physico-chemical properties of Er3+doped silica are presented, which has been related with the effects of hydroxyl groups on the luminescence property of Er3+ in the host matrix of silica. | Journal of Chemistry Vol. 45 1 P. 114 -119 2006 STRUCTURE AND PHySICO-CHEMICAL PROPERTIES OF SILICA GELS DOPED WITH OPTICALLy ACTIVATED Er3 IONS by SOL-GEL PROCESS Received 7 July 2005 NGUyEN VIET LONG1 DU THI XUAN THAO2 NGUyEN Duc CHIEN3 PHAM THANH BINH4 international Faculty of Higher Education Teaching Posts and Telecommunications Ins. Tech. 2University of Mining and Geology institute of Engineering Physics HUT international Training Institute of Materials Science ITIMS HUT SUMMARy This paper is devoted to the study of the relationship between structure and optical properties of silica glasses doped with optically active Er3 ions and reported the influence of the suitably selected heat treatment on the optical properties of silica glasses. The physico-chemical properties of Er3 doped silica are presented which has been related with the effects of hydroxyl groups on the luminescence property of Er3 in the host matrix of silica. I - INTRODUCTION The development of new photonic materials has been studied for the purpose to generate guide switch multiplex and amplify light which has become very necessary in many areas in photonic technology such as high power fiber solid state lasers. To date Er3 -doped silica is one of the most attractive and potential photonic materials for Er3 -doped fiber amplifiers EDFA . Moreover sol-gel technology has been used to incorporate erbium ions into silica gel. Specially trivalent erbium is characterized by an optical transition at pm an important standard wavelength in optical telecommunication which is utilized for optical amplification to compensate the loss of information signal occurring in the longdistance transmission networks 1 . The main problems that influence the optical performance of sol-gel method-based devices are the none-radiative relaxation channels due to rare earth concentration quenching and vibrations of the OH groups 2 - 3 . However the relationships between the structure and physico-chemical properties .

• Hoá học
• Physico Chemical
• Silica gels doped
• Optically activated Er3+ ions
• Công nghệ hóa
• Hóa lý
• Tính chất hóa lý
• Inorganic bio fertilizers
• Soil physicochemical properties
• Rainfed maize wheat cropping system
• Organic on soil physicochemical properties
• Inorganic on soil physicochemical properties
• Pond water
• Physicochemical analysis
• Comparative analysis of the physicochemical parameters
• The physicochemical parameters
• Selected pond water samples
• Physicochemical characteristics
• Foxtail millet genotypes
• Nutritional and physicochemical
• Food product development
• Nine foxtail millet genotypes developed
• Physicochemical parameters
• Food plant
• Pteridium aquilinum
• Congo food plant alicamentary
• Conservation and analysis
• Organic and inorganic nutrients
• Physicochemical properties
• Inceptisol of Chhattisgarh plateau
• Nutrient availability in inceptisol
• Water quality analysis
• Surajpur wetland
• National capital region
• Physicochemical characteristics of water samples
• Physico chemical properties
• Narayanpur block Mirzapur
• Available macro nutrient status
• Relationship with soil physicochemical properties
• Health status
• Seasonal fluctuation
• Diversity indices
• Seasonal fluctuation of physicochemical properties
• Hydrogen bonds
• Electrical current frequency
• Physicochemical characteristics of wastewater
• Optimal treatment regimes
• Công nghệ hóa học
• Công nghệ vậy liệu
• Comparative study on physicochemical properties
• Fe SBA 16 Mesoporous materials
• Cereal source
• Microbial consortia
• Lactic acid bacteria
• Boza beverage
• Physicochemical properties of grape varieties
• Antep Karası
• Kara Dimrit
• Grapes varieties grown in Turkey
• Antiradical activity
• Dried Alkaya apricot
• Dried apricots
• Aroma compounds
• Phytoplankton assemblages
• Spatiotemporal characterization
• Dissolved oxygen
• Phytoplankton taxa
• Earth sciences
• Consistency limits
• Pure clay minerals
• Intermediate plasticity clay
• Silver nanoparticles
• Physiochemical properties
• Silver nanoparticles induced cytotoxicity
• Aggregation interaction
• QSSR models
• Physicochemical property
• Anticancer activity
• Similar structures
• Flavones and isoflavones
• Milk beverage
• Develop milk beverage
• Beetroot and banana were tried
• Synthetic dye
• Effluent discharge
• Bacteria viable count
• Physicochemical assessment of soil contaminated
• Physicochemical and biological characters
• Biomass substrate
• Water hyacinth
• Coconut leaf
• Biological quality characters
• BMC Pediatrics
• Quality assessment
• Albendazole tablets legally circulating
• Pharmaceutical market
• Physicochemical evaluation
• The physicochemical properties
• Spray dried papaya leaf powders
• Spray drying
• Papaya leaf juice
• Maltodextrin concentration
• Total flavonoid content
• Structure of the Aβ42 tetramer
• Physicochemical properties of the Aβ42 tetramer
• Multiscale molecular dynamics simulations
• The proposed all atom structures
• Higher order oligomers
• Micellar CN concentrate
• Zaverage (Z avg)
• Whey proteins
• Micellar casein concentrate
• Tray dryer
• Dried onion powder
• Tray drying characteristics of onion slices
• Tray drying characteristics