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Study On Spectral Properties Glass And Glass-ceramics Based On Rare Earth Doped Na2O-CaO-SiO2 System

Posted on:2012-01-30Degree:MasterType:Thesis
Country:ChinaCandidate:Z G PengFull Text:PDF
GTID:2131330335452375Subject:Materials Processing Engineering
Abstract/Summary:PDF Full Text Request
Glass has some good characteristics, such as uniform, transparency, good chemical stability and isotropic and so on, it easily to make all sorts of sizes and shapes of products such as fiber special-shaped products and big size products. It can be doped high concentrations of rare earth activator ions, and is good host materials for preparation optical materials The 4f electronic structure of rare earths making its good fluorescence properties, such as pure, luminous chromaticity, physico-chemical properties stable and higher conversion efficiency characteristic. Sodium calcium silicate glass is one of the commonnest and also the most extensively used glass material, mainly applied to building, automobile, adornment, lighting, photoelectricity, etc, and the raw materials is cheaper, preparation technology is mature, so the study of rare earth ions in Sodium calcium silicate glass is important and practical application meaning.This paper through a series of glass samples preparation, studies the fluorescence characteristic of Eu3+ different concentration doped, the effect of Sb3+ on the luminescent properties of Eu3+, the effect of alkaline metal and alkali metal oxide partly replaced on the Luminescent Properties of Eu3+, the effect of B2O3 partly replaced SiO2 on the Luminescent Properties of Eu3+; luminescence properties of Sm3+ and Sm3+/Ce3+ doped; and luminescent properties of Tb3+ doped glass and glass-ceramics. Adopt absorption spectrum, excitation spectra and emission spectrum characterization of rare earth ions doped spectrum property. Results show that:1. The absorption, excitation and emission spectra of Eu3+ in glasses and their corresponding transitions are studied. The doped glass can emission orange when absorb ultraviolet and visible light. No observed concentration quenching phenomenon in doping concentration 0-1.0mol% range. When Sb3+ and Eu3+ co-doped, in some extent, Sb3+ could have absorbed part energy transfer to Eu3+, and with Sb3+/Eu3+ increased, the sensitization luminous efficiency ratio also increased.2. When different alkali metal oxide partly replace Na2O, the fluorescence intensity of Eu3+ according to Li+, K+,Na+ order increase. And different Alkaline metal oxide partly replace CaO the fluorescence intensity of Eu3+ according to Sr2+, Ca2+,Mg2+ order increase.3. Moderate B2O3 replace SiO2, found in blue area appears emission peak of Eu2+, it shows that Eu+ and Eu2+ co-exist in glass. The transformation efficiency of Eu3+ to Eu2+ increases with the ratio of B2O3/SiO2. IR spectrum analysis show that [SiO4], [BO4], [BO3] constitute the network structure of glass, and rare earth ions in the network structure.4. Dy3+ can sensitization Eu3+, and when Dy3+ concentration increases, in addition to improving its own emission intensity still can be part of the energy transfer to Eu3+ sensitization its luminous. When Eu3+/Dy3+ ratio is 1:2, sensitization is best.394nm excitation the mixed system, it appears blue, yellow, red colors, and the relative strength of emission about 1:1.5:2.3, so can adjust the concentration that compound emit in various colors.5. The absorption, excitation and emission spectra of Sm3- in glasses and their corresponding transitions are studied. The glass samples appear orange, red fluorescent under using 401nm excitation. The effect of the concentration of Sm3+on luminescent intensity also studied, and determined the best doping concentration in this glass is 0.8mol%. The spectral properties of Ce3+ and Sm3+ co-doped glass is studied, analyzes two rare earth ions possible energy transfer mechanism in the matrix glass., The result show that the effect of Ce3+ sensitization Sm3+6. The excitation and emission spectra of Tb3+ in glasses and glass-ceramics were studied. The effect of the concentration of Tb3+ on luminescent intensity also studied. The results shou that no observed concentration quenching phenomenon in doping concentration range, with the heat treatment of glass, energy transfer between Tb3+-Tb3+, Blu-ray regional emission was abate, and the characteristics of green light emission was strengthened...
Keywords/Search Tags:rare earth doped, soda-lime-silica glass, glass-ceramics, sepectral property
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