TY  - EJOU
AU  - 
T1  - Photoluminescence Characteristics of the Caal2o4: Eu2+ Co-Doped With Ion Dy3+ Synthesized By Combustion Method
T2  - International Journal of Chemistry and Materials Research

PY  - 2014
VL  - 2
IS  - 8
SN  - 2311-763X

AB  - 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.
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