Dissertation > Excellent graduate degree dissertation topics show

Synthesis and Optical Properties of 12CaO·7Al2O3

Author: WuLinFei
Tutor: WangRui
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: high temperature solid state method C12A7 upconversion luminescence white upconversion
CLC: O614.3
Type: Master's thesis
Year: 2010
Downloads: 31
Quote: 1
Read: Download Dissertation

Abstract


The best synthesis conditions of C12A7 polycrystalline powder were determined by a large number of experiments, and pure 12CaO·7Al2O3（C12A7） polycrystalline powder and rare-earth-doped C12A7 polycrystalline powder were synthesized by high temperature solid state method. The results of X-ray diffraction showed that there was no new phase appeared in C12A7 polycrystalline powder. The combination of the results of X-ray diffraction and Ultraviolet-visible absorption spectrum were used to analysis the location of the rare-earth ions.Bright green and weak red color were obtained in Er3+-doped C12A7 polycrystalline powder under diode laser excitation of 980 nm, and the upconversion emission intensity of green and red color were all enhanced through increasing the doped Er3+ ion concentration. Bright green and red color were obtained in Er3+/Yb3+-doped C12A7 polycrystalline powder under diode laser excitation of 980 nm, and the upconversion emission intensity of green and red color were all enhanced through increasing the the doped Yb3+ ion concentration, but obviously, the red upconversion emission intensity enhanced more than the blue upconversion emission intensity. The green emission peaks centered at 530nm and 550nm are attributed to the 2H11/2/4S3/2→4I15/2 transitions of the Er3+ ions, and the observed red emission peaks centered at 660 nm are attributed to the Er3+ ion 4F9/2→4I15/2 transition.White upconversion emission were obtained in Er3+/Tm3+/Yb3+-doped C12A7 polycrystalline powder under diode laser excitation of 980 nm through adjusting the doped Er3+/Tm3+/Yb3+ ions concentrations. The results of experiments showed that the white upconversion emission could well be obtained through increasing the doped Yb3+ ion concentration and decreasing the doped Tm3+ ion concentration while the doped Er3+ ion concentration was fixed. On the contrary, the white upconversion emission could also be obtained through decreasing the doped Yb3+ ion concentration and increasing the doped Tm3+ ion concentration.

Related Dissertations

  1. Optical Properties of Pr3+ Doped 12CaO·7Al2O3 Powders Synthesized by Solid State Reaction Method,TF124.5
  2. Synthesis of NaYF4 Matrix of Up-Conversion Phosphors by a Special Reverse Micelle Method,TB383.1
  3. Investigation on the Synthesis and Optical Properties of Composite Oxide Upconversion Luminescence Materials,TB34
  4. Preparation and Characterization of Up-Conversion Rare Earth Fluorides Micro/Nanomaterials,TB383.1
  5. Upconversion Luminescence Properties of PSZT under Different Temprature and Polarizition,O482.31
  6. Study on the Up-conversion Green Light Properties in Ho3+/Yb3+/Ce3+-codoped LiTaO3 Polycrystals,O734
  7. Rare earth ions Ho ~ (3) doped oxide upconversion photoluminescence study,O482.31
  8. Preparation and Characterization of Gd2O3: RE3+ Up-Converting Luminescent Material,O482.31
  9. The Investigation of Emission Spectroscopic Properties of Eu3+-Doped In:LiNbO3 Crystals,O482.31
  10. Photoluminescence Character and Thermal Application of Rare Earth （Dy, Nd, Yb, Er） Co-doped Al2O3,O482.31
  11. Study on Mechanism of Li~+ Increasement the Upconversion Intensity of Glass Doped Rare Earth Ions,O482.31
  12. Research of the New Materials of Long-lasting Phosphors and Upconversion Luminescence,O611.3
  13. Preparation and Application of Water-soluble NaYF 4 :Yb,Er Upconversion Nanoparticles,TB383.1
  14. Research on Oxybromide Upconversion Phosphors and Silicate Wled Phosphors,O482.31
  15. Preparation and Study on the Luminescent Properties of Rare-Eath Ions Co-Doped Fluoride Nanomaterials,TB383.1
  16. Preparation and Luminescent Properties of Rare Earth Ions Doped Nanomaterials,TB383.1
  17. The Study of Upconversion Luminescence Compound with TiO2,O643.36
  18. Synthesis and Multicolor Up-conversion Luminescence of Rare-earth Doped Fluorides Nanomaterials,TB383.1
  19. Study on the Upconversion Luminescence of Rare-earth Doped NaNbO3 and Sr2TiSi2O8,O482.31
  20. Study on Synthesis and Luminescent of KY3F10:Yb, Tm/Ho and ZnS:Cu,TB383.1

CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section III group metal elements and their compounds
© 2012 www.DissertationTopic.Net  Mobile