Investigation of luminescence properties of Pb ²⁺ ‐doped Sr ₂ B ₂ O ₅ phosphor

Abstract A near‐ UV emitting phosphor, Pb ²⁺ ‐doped Sr ₂ B ₂ O ₅ was synthesized by the solid‐state reaction method at 900°C for 3 hours in air. The structure of the phosphor was verified by X‐ray diffraction study which shows monoclinic phase. Fourier transform infrared ( FTIR ) analysis confirmed the formation of Sr ₂ B ₂ O ₅ . The excitation and emission spectra of the synthesized phosphors were investigated at room temperature with photoluminescence spectrophotometer. The emission and excitation bands of Pb ²⁺ ‐doped Sr ₂ B ₂ O ₅ were observed at 370 and 289 nm, respectively. The dependence of the PL intensities on the Pb ²⁺ concentration for the Sr _{2− x} P b _x B ₂ O ₅ (0.01 ≤ x ≤ 0.03) phosphors was studied and it was observed that the concentration quenching of Pb ²⁺ in Sr ₂ B ₂ O ₅ is 0.025 mol.