Dissertation > Excellent graduate degree dissertation topics show

Research on Luminescence of Nanoporous Glass Composite Materials

Author: GongFanHan
Tutor: YangZhongMin；SongWuYuan
School: South China University of Technology
Course: Materials Engineering
Keywords: Nanoporous glass High silica glass Ions doping Glass-ceramics Luminescence
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 20
Quote: 0
Read: Download Dissertation

Abstract


The ion-doped luminescent glass and glass-ceramics have been the focus of research for optical functional materials. The quartz glass, as an host for rare earth ions doping, shows extremely serious concentration quenching effect due to the forming of rare earth ion clusters. While for the traditional glass-ceramic, it is difficult to control the species, size and distribution of nanocrystals. Since the connected uniform channel in nanoporous glass provides a well-established microenvironment for accommodating dopant ions and the crystal growth, nanoporous glass offers an efficient approach to solve the above technical problems.In this work, the undamaged nanoporous glass with connected pores is prepared based on the traditional melt phase-separation method, and the pores are well controlled and uniformly distributed. The yield of nanoporous glass is as high as 90%. The investigation shows that the sintered nanoporous glass has a high transmittance in ultraviolet region.Using this nanoporous glass as a substrate, the Eu2+/ Al3+, Eu2+/ Mn2+ and Eu2+/Mn2+/Al3+ co-doped luminescent high silica glass is prepared by ions-impregnation and high temperature sintering. The emission intensity of Eu2+ and Mn2+ is enhanced by co-doping Eu2+/ Al3+ respectively. The emission color could shift from blue to green by changing the concentration of Eu2+ and Al3+. The energy transfer between Eu2+ and Mn2+ is also observed in this Eu2+/Mn2+/Al3+ co-doped high silica glass.On the basis of as-prepared nanoporous glass, a new method to prepare glass- ceramics is presented. Colorless transparent high silica glass with nano-crystal is prepared by a two-segment process, which involves crystal growth at low temperature and nanochannel collapse at high-temperature. With this approach, high silica glass with nano-crystallineβ-Ga2O3 and ZrO2 semiconductor could be obtained. Emission of UV, blue, green and red light in high silica glass ceramics with nano-crystallineβ-Ga2O3 is presented. In the high silica glass ceramics with nano ZrO2, violet and blue-green light emission is observed. Additionally, it is found that the Zr4+ion could enhance the luminescence of the high silica glass matrix at 288 nm and 396 nm. This new preparation method overcomes the shortcomings of difficulty in controlling the crystal species, crystal size and its luminescence in the porcess of preparing the traditional glass-ceramics.

Related Dissertations

  1. Germanium and its oxide nanowire synthesis, characterization and properties of,TB383.1
  2. Syntheses, Structures and Properties of Coordination Polymers with Aromatic Dicarboxylates,O631.1
  3. Preparation and Study of Mn2+ Activated Silicate-based Red Phosphors,O482.31
  4. Synthesis, Characterization, and Properties of Organometallic Complexes with Heterocyclic Ligands,O641.4
  5. Midu and Weishan Basin Pleistocene geological characteristics and evolution of the,P542
  6. Some Investigation of Comprehensive Utilization of Oil Shale Residue,X74
  7. Deposition and Optical Properties of Doped Nano-Silicon Carbide Thin Films,O613.72
  8. Rare earth ions Ho ~ (3) doped oxide upconversion photoluminescence study,O482.31
  9. Synthesis and Properties of ZnS Fluorescent Quantum Dots by Oil-Water Interface,O614.241
  10. Study on the Iuminescent Properties of Rare-earth Ions Doped NaYF4 Nanoparticles and Glass-ceramics,TQ171.11
  11. Study on Synthesis and Luminescent of KY3F10:Yb, Tm/Ho and ZnS:Cu,TB383.1
  12. Fabrication of Si-based Nano-patterned Structures and Its Applications in Light Emitting Device and Solar Cells,TB383.1
  13. Synthesis and Optical Properties of 12CaO·7Al2O3,O614.3
  14. Synthesis, Structure and Properties of Organometallic Complexes Based on Benzimidazole Derivatives,O641.4
  15. Study on Eu or Tb Doped Alkaline Earth Polysilicate Phosphors,O613.72
  16. Preparation and Research on Spectral Properties of Bi-doped Silica-based Glasses,TQ171.1
  17. Synthese, Structure and Properties of Metal Coordination Polymers with Bipyridine Polycarboxylate,O621.13
  18. Preparation and Luminescence Properties of Phosphors Excited by Ultraviolet for White Light Emitting Diodes (WLED),O482.31
  19. The Structure Study of Nanocrystals in Rare-earth Doped Oxyfluoride Glass Ceramics,TB383.1
  20. Study on the Upconversion Luminescence of Rare-earth Doped NaNbO3 and Sr2TiSi2O8,O482.31

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile