Photo-quenched of the luminiscence signal in Co(II)-doped alumina prepared by the sol–gel method
Source abstract
Abstract
Abstract Co(II)-doped alumina monoliths prepared by the sol–gel method were laser irradiated producing fluorescence. The intensity of this defect-induced fluorescence was exponentially reduced with the irradiation time to practically disappear. The rate the fluorescence intensity decays was modeled as a double exponential function of the irradiation time; the characteristic times associated with the decays are in the range of seconds. The suppression of the luminescence was associated with the local heating produced by the highly focused laser beam in a small area (≈ 2 μm in diameter) on the sample. This heating process reduces physical (grain boundaries and surface states) and chemical (oxygen vacancies) defects present in the sol–gel samples. Some residual fluorescence still remains after long periods of illumination. The characteristic times for alumina samples are compared with those obtained for other metal oxides prepared also by the sol–gel method.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Glass properties and applications · TiO2 Photocatalysis and Solar Cells
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (35)
Show source-provided references
1. Nano α-Al2O3-t-ZrO2 composite powders by calcining an emulsion precursor at 1100°C10.1016/j.jallcom.2008.01.127 ↗
2. Fabrication of porous alumina ceramics from powder mixtures with sol–gel derived nanometer alumina: effect of mixing method
3. Synthesis and properties of thermostable γ-alumina prepared by hydrolysis of phosphide aluminum10.1016/j.jallcom.2007.12.007 ↗
4. Study on the morphology of α-Al2O3 precursor prepared by precipitation method10.1016/j.jallcom.2007.12.092 ↗
5. Sintering behavior and microstructural evolution of ultrapure α-alumina containing low amounts of SiO210.1016/j.jeurceramsoc.2007.04.015 ↗
6. McCormick · 1994
7. Lenhard · 1994
8. Sol–gel principles and applications
9. Brinker · 1990
10. Spectrophotometric detection of heavy metals by doped sol–gel glass detectors
11. Characterization of various stages of the sol–gel process
12. Rare earth doped sol–gel materials as potential absorbance standards10.1016/S0925-8388(99)00774-4 ↗
13. Synthesis and optical properties of yttria-doped ZrO2 nanopowders10.1016/j.jallcom.2007.04.011 ↗
14. Surface and texture properties of Tb-doped ceria–zirconia solid solution prepared by sol–gel method10.1016/S1002-0721(07)60042-8 ↗
15. Porous zirconium titanate ceramics synthesized by sol–gel process10.1016/j.jeurceramsoc.2008.07.001 ↗
16. Effect of oxygen vacancies on electrical properties of Ce0.8Sm0.1Nd0.1O2−δ electrolyte: an in situ Raman spectroscopic study
17. Sol–gel synthesis, X-ray photoelectron spectroscopy and electrical conductivity of Co-doped (La, Sr)(Ga,Mg)O3–5 perovskites10.1016/j.jeurceramsoc.2007.02.147 ↗
18. Photoluminescence and cathodoluminescence of Tb-doped Al2O3–ZrO2 nanostructures obtained by sol–gel method10.1016/S0301-0104(03)00237-4 ↗
19. The effect of zirconia content on properties of Al2O3–ZrO2(Y2O3) composite nanopowders synthesized by aqueous sol–gel method
20. SrAl2O4 improved SrCo0.8Fe0.2O3 mixed conducting membrane for effective production of hydrogen from methane
21. Effect of Al dopant on the hydrothermal oxidation behavior of Ti3SiC2 powders
22. Cobalt-doped silica membranes for gas separation10.1016/j.memsci.2008.10.015 ↗
23. Raman and X-ray diffraction study of boehmite gels and their transformation to α- or β-alumina10.1016/0022-4596(90)90142-K ↗
24. Raman study of the formation of transition alumina single crystal from protonic β/β″ aluminas10.1007/BF00719972 ↗
25. Sol–gel synthesis and photoluminescence of CaSiO3:Eu3+ nanophosphors using novel silicate sources10.1016/j.jpcs.2008.07.012 ↗
26. Tartaric acid-assisted sol–gel synthesis of Y2O3:Eu3+ nanoparticles10.1016/j.jallcom.2008.01.088 ↗
27. Luminous properties of Tb3+ in the ZrO2 and TiO2 nanoparticles
28. Solution-combustion synthesis of Tb3+-doped Y3Al5O12 nanoparticles10.1016/j.jlumin.2008.11.004 ↗
29. Luminous properties of Tb3+ in the ZrO2 and TiO2 nanoparticles10.1016/j.jlumin.2006.01.313 ↗
30. Chlorobenzene, chloroform, and carbon tetrachloride adsorption on undoped and metal-doped sol–gel substrates (SiO2, Ag/SiO2, Cu/SiO2 and Fe/SiO2)10.1016/j.jhazmat.2008.05.051 ↗
31. The effect of zirconia content on properties of Al2O3–ZrO2 (Y2O3) composite nanopowders synthesized by aqueous sol–gel method
32. Alumina α-Al2O3 (ī10): an ab-initio examination of the surface electronic structure
33. Defect-induced luminescence in Co(II)-doped anatase TiO2 prepared by the sol–gel method10.1016/j.jnoncrysol.2004.07.068 ↗
34. Defect-induced luminescence in sol–gel silica samples doped with Co(II) at different concentrations10.1016/j.mseb.2007.08.001 ↗
35. Photo-quenched luminescence in Co (II)-doped sol–gel zirconia10.1007/s10971-007-1608-9 ↗