Synthesis of SrAl2O4: Eu2+, Dy3+, Gd3+ phosphor by combustion method and its phosphorescence properties

Eu2+, Dy3+ and Gd3+ co-doped strontium aluminate yellow-green phosphor was synthesized by combustion method using urea as reducer at 600 °C. The crystallization, particles size and luminescence properties of the sample have been investigated. The results are as follows: Eu2+, Dy3+ and Gd3+ doped into the phosphor do not change the crystalline structure of strontium aluminate. The average size of particles is about 100 nm. The excitation and emission spectra are broad bands with the peaks at 348 and 515 nm, respectively. Compared with SrAl2O4: Eu2+, Dy3+ phosphor, the initial brightness improved and the afterglow time prolonged.