Abstract
Eu 2+, Dy 3+ co-doped strontium aluminate (SrAl 2O 4) phosphor nanometer powders with high brightness and long afterglow were prepared by heating the precursor gel (resulted from sol–gel method) at 900 °C and a reductive atmosphere of active carbon. The average particle size of the SrAl 2O 4:Eu, Dy phosphor powders was 59±7 nm and its optical properties have been studied systematically. The broad band UV excited luminescence of the SrAl 2O 4:Eu, Dy was observed at λ max=506 nm due to transitions from the 4f 65d 1 to the 4f 7 configuration of the Eu 2+ ion. The results indicated that the main peaks in the emission and excitation spectrum shifted to the short wavelength compared with phosphor obtained by the solid-state reaction synthesis method. The decay speed of the afterglow for nanometer phosphors was faster than that obtained by the solid-state reaction method.
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