Synthesis and Luminescence Properties of Na₂Al₂B₂O₇:M (M = Dy³⁺ and Sm³⁺)

Dy³⁺- and Sm³⁺-doped Na₂Al₂B₂O₇ phosphors were synthesized at 850°C for 6 h in air. The phase analyses of all prepared borates were carried out using powder X-ray diffraction (XRD). A spectrofluorometer was used to examine the photoluminescence (PL) characteristics of the prepared phosphors at room temperature. When excited at 350 nm, Na₂Al₂B₂O₇:Dy³⁺ radiates at 481–491, 575–583, and 673 nm. After being excited at 402 nm, Na₂Al₂B₂O₇:Sm³⁺ radiates at 561, 603, 650, and 709 nm. As a result of this study, two new optical materials that emit light in the visible region were prepared.