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

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⁺.