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Study On Syntheses And Luminescent Properties Of Light-Conversion Glass Doped With Rare Earth Ions

Posted on:2007-03-11Degree:DoctorType:Dissertation
Country:ChinaCandidate:P T ShiFull Text:PDF
GTID:1101360245483103Subject:Applied Chemistry
Abstract/Summary:PDF Full Text Request
The light-conversion materials have developed rapidly in recent years. The conventional light-conversion films may considerably increase the yield and quality of the product. However, the ability of these films to endure weather and their later machining are poor and at the same time, the disposed light-conversion films can bring about environmental problems, so the light-conversion films are limited in use. A new kind of light-conversion glass has been synthesized, and it will become a new kind of light-conversion material, Which is the innovation in this paper.1.The CaO-B2O3-SiO2: Eu3+ glasses are synthesized in air atmosphere. The glass-forming regions of samples are studied by searching point by point, the temperature for synthesis is studied by XRD, and the structure of network is studied by infrared spectrum. We have also studied the excitation of emission spectra of Eu3+ in glasses and their corresponding transitions, and the effect of the concentration of Eu3+ and the thickness of glass on luminescent intensity.2. The CaO-B2O3-SiO2: Eu2+ glasses are prepared in deoxidized atmosphere. The excitation and emission spectra of Eu2+ and their corresponding transitions are studied. We have also studied the effect of the concentration of Eu2+ on luminescent intensity, the relationship between the luminescent properties and the conditions of synthesis, the ESR in glass, and the energy level of Eu2+ in glass. The ESR in glass confirms the existence of Eu2+ in glass.3. The CaO-B2O3-SiO2: Sm3+ are prepared in air atmosphere by conventional high temperature process. The excitation and emission spectra of Sm3+ and their corresponding transition are studied. We have also studied the effect of the concentration of Sm3+ on luminescent intensity, the relationship between the excitation wavelength and the luminescent intensity ratios at 650nm and 605nm of Sm3+ in glass, and the relationship between the concentration of Sm3+ and the luminescent intensity ratios at 650nm and 605nm of Sm3+ in glass. The best ratio of B2O3/SiO2 is 1.2-0.8.4. The excitation and emission spectra of Ce3+ in CaO-B2O3-SiO2: Ce3+ glasses and their corresponding transitions are studied. We have also studied the coordinate state and energy level of Ce3+, and the luminescent properties of CaO-B2O3-SiO2: Ce,Sm and their probable mechanism.5. The CaO-B2O3-SiO2:Pr3+ glasses are synthesized. The excitation and emission spectra of Pr3+ in glasses and their corresponding transitions are studied. We have also studied the energy level and the concentration quenching of Pr3+. The luminescent parameters fitting of Pr3+ in glasses is analyzed.6. The sensitized luminescence in glasses are studied. The sensitized phenomenon such as Bi3+'Eu3+, Gd3+'Eu3+, Sm3+'Eu3+, Pr3+'Eu3+, Tb3+'Eu3+, Bi3+'Sm3+, Mn3+'Sm3+ can be found in the glasses. The luminescent properties and sensitized mechanism are studied. The luminescent intensity is stronger when a little Bi3+ is co-doped. The energy transfer between Bi3+ and Eu3+ is mainly through the re-absorption of light, not through the resonant energy transfer or the exciton transfer. The sensitized mechanism and the best concentration of Bi3+are studied. The luminescent intensity is stronger when a little Sm3+ or Pr3+ is co-doped. The energy transfer is probably through resonant energy transfer supported by phonons. The sensitized mechanism and the best concentration of Sm or Pr are studied. When CaO-B2O3-SiO2 glasses are co-doped with Eu3+ and Tb3+, an electron can transfer from Tb3+ toEu3+:Eu3+(4f6)+ Tb3+(4f8)'Eu3+(4f7)+ Tb3+(4f7)The Eu3+(4f6) ion tends to obtain an electron to get stable electronic configuration (4f7) and Tb3+(4f8) ion tends to lose an electron in order to get its stable electronic configuration (4f7). The luminescent intensity is stronger when a little Gd3+ is co-doped. The sensitized mechanism and the best concentration of Gd3+ are studied. The luminescent intensity of Sm3+ is stronger when a little Bi3+ is co-doped. The energy transfer between Bi3+and Sm3+ is through resonant energy transfer, not through the re-absorption of light or the exciton transfer. The energy transfer between Bi3+and Sm3+ is the result of the interaction of electric-dipole and electric-quadrupole. The best concentration of Bi3+is studied. The luminescent intensity of Sm is stronger when a little Mn2+ is co-doped. The study shows that the energy transfer between Mn2+ and Sm3+ is the result of the interaction of electric-dipole and electric-quadrupole. We've also studied the best concentration of Mn2+.
Keywords/Search Tags:rare-earth, light-conversion, luminescence, sensitize
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