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초록·키워드
Luminescent sources based on crystalline materials doped with transition metal or rare-earth cations are known as persistent phosphors, and they can continue to emit light even after the excitation source has disappeared. The present study aims to prepare strontium aluminate with varying weight percentages of Eu<sup>2+</sup>, RE<sup>3+</sup> (RE = Dy<sup>3+</sup>, Nd<sup>3+</sup>, or B<sup>3+</sup>) oxides by the solid-state preparation followed by firing under active carbon at 1250 °C.The produced phosphors were examined using FTIR spectroscopy, mechano-luminescent measurement, scanning electron microscopy (SEM), and X-ray diffraction (XRD). A bulk density and apparent porosity measurement was also used to assess the impact of the firing temperature at 1250 °C. Photoluminescence characteristics were examined concerning the kind of trivalent oxides doped in strontium aluminate. The results showed that for samples containing 0.15 weight% of Eu<sub>2</sub>O<sub>3</sub> and 0.15 weight% of RE<sub>2</sub>O<sub>3</sub>, SrAl<sub>2</sub>O<sub>4</sub> formed with Eu<sup>+ 2</sup>, RE<sup>3+</sup> as a single phase. However, RESr<sub>2</sub>AlO<sub>5</sub> was formed together with a minor amount of SrAl<sub>2</sub>O<sub>4</sub> when the Eu<sub>2</sub>O<sub>3</sub> contents decreased at the expense of the RE<sub>2</sub>O<sub>3</sub> contents. Additionally, it was observed that the Eu<sup>3+</sup> was converted into Eu<sup>2+</sup> for every sample. Every sample had porous behavior, and the bulk density was increased by the inclusion of RESr<sub>2</sub>AlO<sub>5</sub> in addition to SrAl<sub>2</sub>O<sub>4</sub>. Transitions from the 4f<sup>6</sup> and 5d<sup>1</sup> configurations of the emission center (Eu<sup>2+</sup> ions) to the 4f<sup>7</sup> configuration result in a broad band at peaks of 517 nm in the emission spectra of all the samples. Samples containing RESr<sub>2</sub>AlO<sub>5</sub> exhibit high phosphor color characteristics, forming red-orange phosphors encircled by green phosphor rings. Compared to samples containing Nd<sub>2</sub>O<sub>3</sub> and B<sub>2</sub>O<sub>3</sub>, those containing Dy<sub>2</sub>O<sub>3</sub> phosphor have the highest decay time values.
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