Synthesis and Photoluminescence Properties of Pb2+-Doped Ca2B2O5

Undoped and a series of Pb²⁺ ion-doped UV-emitting Ca_2-xPb_xB₂O₅ (0.0025 ≤ x ≤ 0.03) phosphors were prepared via the solution combustion method, and their prospective luminescence properties were investigated. The formation of the monoclinic phase of Ca₂B₂O₅ was confirmed by the powder X-ray diffraction result. The Ca_2-xPb_xB₂O₅ (0.0025 ≤ x ≤ 0.03) phosphors’ photoluminescence properties were examined using a spectrofluorometer at room temperature. The broadband peaking at 331 nm is the emission peak of Ca₂B₂O₅:Pb²⁺ (0.01 mol), which is ascribed to the ³P₁→¹S₀ transition. For Ca₂B₂O₅, the relationship between the emission intensity and the Pb²⁺ content was thoroughly examined. Finally, utilizing the excitation band at 273 nm and the emission band at 331 nm, the Stokes shift of the prepared material, Ca₂B₂O₅:Pb²⁺, was determined to be 6418 cm^-1.