Photoluminescence Characteristics of the Caal2o4: Eu2+ Co-Doped With Ion Dy3+ Synthesized by Combustion Method

Nguyen Ngoc Trac, Nguyen Manh Son and Phan Tien Dung

International Journal of Chemistry and Materials Research, 2014, vol. 2, issue 8, 75-80

Abstract: The phosphors of CaAl2O4: Eu2+, Dy3+ with varying concentrations were synthesized by combustion method. The monoclinic single phase structure of CaAl2O4 was investigated by X-ray diffraction. The emission spectra of phosphors had a broad band with maximum at 444 nm due to electron transition from the 4f65d1 to the 4f7 of Eu2+ ion and a small peak at 575 nm due to 4F9/2 6H13/2 transition of Dy3+ ions. The excitation spectra and the decay time of phosphors were investigated also. The phosphors of CaAl2O4: Eu2+, Dy3+ had long persistence luminescence. In these phosphors, Eu2+ ions play the role of activators. Whereas, Dy3+ ions generate the hole traps that lead to the long persistent phosphorescence and act as the activators in the phosphors simultaneously. The concentration of Dy3+ ion co-doped has strong influence on the luminescence of phosphor.

Keywords: Alkaline earth; Photoluminescence; Persistence; Phosphorescence; Combustion method; Calcium aluminate (search for similar items in EconPapers)
Date: 2014
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