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Study On The Luminescent Nanosize Materials Of SrAl2O4: Eu~(2+), Dy~(3+)

Posted on:2005-12-08Degree:MasterType:Thesis
Country:ChinaCandidate:P ZhangFull Text:PDF
GTID:2121360242956065Subject:Materials science
Abstract/Summary:PDF Full Text Request
SrAl2O4 luminescent materials were a new type of long-lap phosphor materials without pollution to atmosphere. For improving the properties of luminescent of SrAl2O4 materials, the study of nanosize SrAl2O4 materials were conducted. Based on the analysis of international and domestic literatures, the nanosize powders of SrAl2O4: Eu2+, Dy3+ luminescent were prepared by inorganic sol-gel method, using Eu2+ and Dy3+ as co-activators, H3BO3 as flux. The synthesis progressof phosphors, fluorescent properties and the progress of afterglow decay of nanosize SrAl2O4 materials were studied in this paper. The main conclusions were listed as follows:The nanosize powders of SrAl2O4: Eu2+, Dy3+ luminescent with the grain size ranging from 50-100nm could be prepared using inorganic sol-gel method. The clear blue shift phenomenon of the nanosize powders of SrAl2O4: Eu2+, Dy3+ luminescent were observed in the experience. Its emission wavelength was around 500nm; the excitation wavelengths were about 305nm and 330nm. The nanosize powders with the average grain size about 100nm after calcinating at 1200℃for 2h exhibited the higher luminescene intensity. The emission wavelength of nanosize powders would shift to long-wave band with the increase of calcinating temperature. The addition of H3BO3 resulted in the decrease of calcinating temperature of dry gel and. appearing of the blue shift. In this experience, the optimizational addition of H3BO3 was 0.3mol. The addition of small amount of Eu2+ resulted in the increase of quenching concentration and luminescent intensity of nanosize powders of SrAl2O4: Eu2+, Dy3+ luminescent without changing the crystal structure of SrAl2O4.The optimizational concentration of Eu2+ was 0.3mol%.Comparing the nanosize powders obtained by inorganic sol-gel method with that of solid reaction method,it can be found that the nanosize powders exhibit the higher initial luminescence intensity and the fast after-glow decays This was attributed to the quantum-size-effect of the luminescent particles and the effect of quenching center of the nanosize powder.
Keywords/Search Tags:SrAl2O4, Eu2+, Dy3+, sol-gel method, nanosize powder, H3BO3
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