Dissertation > Excellent graduate degree dissertation topics show

Synthesis and Photoluminescence Properties of Ca2-xSmxSn1-yMyO4 （M＝Ce,Ti） Phosphors

Author: YeJiangZhou
Tutor: FuShiLiu
School: Shantou University
Course: Materials Physics and Chemistry
Keywords: Ca2-xSmxSnO4 Ca2-xSmxSn1-yCeyO4 Ca2-xSmxSn1-yTiyO4 Luminescence Properties Charge transfer Energy transfer
CLC: O482.31
Type: Master's thesis
Year: 2010
Downloads: 17
Quote: 0
Read: Download Dissertation

Abstract


Use of high-temperature solid-phase reaction synthesis Ca 2 SnO 4 : Sm 3 , Ca 2 SnO 4 : (Ce 4 the Sm 3 ) and Ca 2 SnO 4 : (Ti < sup> 4 , Sm 3 ) luminous body, using X-ray diffraction techniques, fluorescence spectroscopy and lifetime testing means the structure and luminescence properties of the samples studied. XRD results showed that 4 Ca 2 SnO single doped Sm 3 , or co-doping of Ce 4 / Sm 3 and the Ti 4 / Sm 3 not change the crystal structure of the matrix. Sm 3 ions in the of Ca 2 SnO 4 unusual emission characteristics, its launch only the existence 4 the the G 5/2 -6H5 / 2 and 4 G 5/2 - 6 H 7 / 2 the transition without 4 G 5/2 -6H9 / 2 transitions; launch a yellow emission transition 4 G 5/2 -6H5 / 2 strength instead usually 4 the G 5/2 - 6 H 7/2 red emission transition. Ca 2 SnO 4 : Sm 3 sample 210 3 40nm range memory in Sm 3 < / sup>-O 2 - charge transfer absorption band, during which there are two broadband peaks at 247nm and 277nm nearby. Ca 2 SnO 4 : the Sm 3 samples contain? 1? 0.74ms and? 2? The 4.80ms two fluorescence lifetime. Ca 2-x Sm x Sn 1-y CeyO, 4 emission spectra of the samples by the Ce 4 the charge migration launch broadband -O 2 - and Sm 3 ions , 4 G 5/2 -6HJ (J = 5/2, 7/2, 9/2) emission line spectrum composed of two Launch Center launch with Sm 3 and Ce < sup> 4 doping concentration to produce great changes. Sm 3 doping concentration is low, the sample obvious existence of Ce 4 -O 2 - of Blu-ray emission and Sm 3 of yellow and red emission; samples almost exclusively when Sm 3 doping concentration higher performance Sm 3 ions Launch. The emission color of the sample can be adjusted by changing the concentration of the dopant ions. The ce 4 The-O 2 - blue luminescence lifetime of approximately 76μs, its energy comes from O 2 < sup> - and of Ce of 4 ion charge transfer absorption; Sm 3 light-emitting millisecond fluorescence lifetime, its energy comes from O 2 - and Sm 3 ion charge transfer absorption. The ce between 4 and Sm , 3 ion energy transfer phenomenon. Ca 2-x Sm x Sn 1-y Ti y O 4 samples The emission spectra from Ti -O the charge transfer emission broadband - and the Sm 3 ion 4 G 5/2 -6HJ (J = 5/2, 7/2, 9/2) emission line spectrum. When Sm 3 doping concentration is low, the sample significantly at the same time there are Ti 4 -O 2 - and the Sm 3 of emission; Sm 3 doping concentration and high Ti 4 -O 2 - charge transfer emission disappear, a sample performance for the launch of the Sm 3 ions. The emission color of the sample can be adjusted by changing the concentration of the dopant ions. Ti 4 -O 2 - and the Sm 3 Center emission energy are derived from the Ti < / sup>-O 2 - of the charge transfer absorption, to absorb broadband located about 276 nm, Ti 4 -O 2 < / sub> - the Sm 3 by non-radiative transfer processes between energy transfer.

Related Dissertations

  1. Study on the Fluorescence Analysis of Penicillins Antibiotics,R155.5
  2. Synthesis, Luminescent Properties of Pyrazoline and Carbazole Compounds,O626.2
  3. Theoretical study of carbazole derivatives,O626
  4. Syntheses, Structures and Properties of Coordination Polymers with Aromatic Dicarboxylates,O631.1
  5. Based on the spectrum of rare earth doped materials under conversion and Its Application,TM914.4
  6. Based on hydraulic transmission for wind energy machine \,TM614
  7. TBM cutterhead drive system energy technology research,U455.39
  8. Wireless Power Transfer Technology Via Coupled Magnetic Resonances for Embedded Fault Diagnosis System,TM724
  9. Gain unit based on the high - speed low data maintain power consumption eDRAM design,TP333
  10. Fabrication and Research of Borate Phosphor Used for White LEDs,O482.31
  11. The Study on Adsorption Properties of Denitrification by CuO/γ-Al2O3 Catalysts,X701.2
  12. Dendrimer Generation Effects on the Photophysical Properties of Poly (Aryl Benzyl Ether) Dendrictic Zinc (Ⅱ) Phthalocyanines and the Dendritic Phthalocyanines-loaded Polymeric Nanoparticles,TB383.1
  13. Study on the Photoluminescence Properties of Gd2O3:Sm and Bi3+/Na+ Doped Gd2O3:Sm Nanocrystals,TB383.1
  14. Synthesis and Photoluminescence Properties of Ti4+ and Eu3+ Doped or Codoped M2SnO4（M=Ca, Sr, Ba） Phosphors,TB34
  15. The Design, Synthesis of Coumarin-based Dyes and Its Appilication as Optical Probe for Ions,TQ611
  16. Preparation and Research on Spectral Properties of Bi-doped Silica-based Glasses,TQ171.1
  17. The Research on Fluorescence Spectrum Imaging and Photobleaching at Single Molecule Level,O657.3
  18. Application of Fluorescence Method in Determination of Nicotine and Lomefloxacin,R927.2
  19. Research on Measuring Technology of High Frequecy Current Based on Wireless Energy Transfer,TM933.1
  20. Coupled Heat Transfer Model and Simulation for Buildings,TU111
  21. Dynamic Characteristics Research on the Valve of Electromagnetic Impactor,TH137.52

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