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Erschienen in:
11.10.2016
The effect of Eu and Dy dopants on the luminescence properties of Sr4Al14O25:Eu2+, Dy3+ phosphorescent nano-pigments prepared by the solution combustion method
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 12/2016
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Abstract
Long lasting Sr4Al14O25:Eu2+, Dy3+ phosphorescent nano-pigments were synthesized by the solution combustion method. Solution combustion involves the exothermic reaction of oxidizers and an organic fuel and is a suitable method for producing chemically homogenous and pure powders with smaller particle sizes. Phase analysis by XRD proved the formation of Sr4Al14O25 with crystallite sizes of about 84 nm. SEM micrographs showed a wide particle size distribution. The emission spectra showed an intense emission peak at about 485 nm. In high doping concentrations a red peak shift of about 10 nm was observed due to crystal structure contraction. The effect of a wide range of Eu2+ and Dy3+ ion concentrations as two important variables was studied, and it was deduced that the concentration of the ions has a considerable effect on the emission intensity and maximum peak wavelength of these pigments. This phosphor showed a broad excitation band in the range 220–500 nm which lasted for a relatively long time.