Dissertation > Excellent graduate degree dissertation topics show

Study on Preparation and Properties of the Red Long Afterglow Phosphors of Eu Ions in Different Valences as Activator

Author: LiJian
Tutor: CuiCaiE
School: Taiyuan University of Technology
Course: Condensed Matter Physics
Keywords: phosphors red long afterglow Sr3Al2O6 Y2O2S
CLC: O482.31
Type: Master's thesis
Year: 2011
Downloads: 98
Quote: 0
Read: Download Dissertation

Abstract


This paper aims to study the red long afterglow phosphors of Eu ions in different valences as activator. Studying on the preparation of Y2O2S:Eu3+,Mg2+,Ti4+ and the concentration of doping ions, to make to develop a red long afterglow phosphor which is steady and excellent performance. Based on the previous work, studying on the effect of different excitation monitoring wavelengths on emission spectrum of red long afterglow phosphor Sr3Al2O6:Eu2+,Dy3+.The red long afterglow phosphor Y2O2S:Eu3+,Mg2+,Ti4+ was prepared with high temperature solid-state reaction. Studying on the calcined temperature of preparation of the sample and the content of Eu3+, Mg2+, Ti4+ ions. It revealed that the best calcined temperature is 1200℃.When the content of the Eu3+, Mg2-, Ti4+ are respective 0.06,0.02 and 0.02,the afterglow time of the sample is longest, which is 50 minute.The Eu2+ and Dy3+ ions co-doped Sr3Al2O6 phosphor powders with long afterglow was prepared with high temperature solid-state reaction. It was found that the sample is composed of pure Sr3Al2O6 phase. Furthermore, it obtained the emission peak of 537 nm under 360 nm excitation and that of 590 nm excited by 468 nm-light, respectively, and it is more interesting that the emission peaks is at 537 nm and 590 nm under 394 nm excitation. The affection of different excitation wavelengths to the emission spectrum were explained reasonably by the effect of nephelauxetic and crystal field. It revealed that the two types of luminescence with different color were caused by the differences of the center of gravity of the 5d excited state energy level and the split range of 5d energy level.

Related Dissertations

  1. Preparation and Luminescence Properties of Blue-emitting NaxK1-xSrPO4:Re (Re=Eu2+, Tb3+) Phosphors,O482.31
  2. Synthesis and Properties of Rare Earth Red-emitting Phosphors for White LED,O482.31
  3. Synthesis and Characterization of Several Oxide, Phosphate and Sulfide Phosphors,O482.31
  4. Investigation of Preparation and Luminescent Properties of the Red Emissive Phosphors for WELD,O482.31
  5. The Investigation of Preperation and Photoluminescenc of Si-N Containing Phosphors Applied for White LED,O482.31
  6. Study on Electrospinning Fabrication of La2M2O7（M=Ti,Zr,Sn）:RE3+ Nanobelts and Their Luminescent Properties,TB383.1
  7. Investigation of SrSiO4: Eu2+ Phosphors and Oxyfluoride Glasses for W-LED,O482.31
  8. Preparation and Luminescence Properties of Sr2-xBaxSiO4:nEu2+, mCe3+ Phosphor for WLED,O614
  9. PDP blue phosphor performance optimization study,O482.31
  10. Research of Preparation and Photoluminescent Properties on the Red, Green and Purple Phosphors Doped with Rare Earth,O482.31
  11. Reduction of Eu Ions in Sr3Al2O6,TB34
  12. Preparation and Characterization of Phosphors Activated by Eu(Ⅱ) or Eu(Ⅲ) and Their Application in Light-emitting Diodes,TN312.8
  13. Agricultural Cropping Patterns and Nonpoint Source Pollution Control within the Songhua Reservoir Basin,X52
  14. Synthesis and Photoluminescence Characteristics of the Full-color Phosphorescent Material,TB34
  15. Study on the Preparation and Properties of Sr3Al2O6 System Red Luminescent Materials,TB34
  16. Researches on Synthesis and Photoluminescence of the Red Long Persistent Phosphors and Films CaTiO3: Pr3+,TN104.3
  17. Preparation and Luminescent Properties of Red Long Persistent Phosphors Ca0.8Zn0.2TiO3: Pr3+,TN104.3
  18. Synthesis and Optical Properties of Photolumiescence Materials Based on Molybdate,TQ422
  19. Synthesis and Characterization of Long-Lasting Nano-phosphors,TB383.1
  20. Preparation and Characterization of Phosphors for LED,TQ422
  21. Synthesis and Optical Properties of BaMoO4: Pr3+ Phosphor System for White LED Application,O611

CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Optical Properties > Luminescence
© 2012 www.DissertationTopic.Net  Mobile