Enhanced photoluminescence properties of BaAl2O4: Ce3+/Li+ yellow phosphors

Abstract

Ce³⁺/Li⁺-activated barium aluminate phosphor (BAO) was synthesized by conventional solid-state reaction method. The crystal structure of the synthesized phosphor was analyzed by X-ray diffraction (XRD) and Raman spectroscopy analysis. Fourier transformed infrared spectrum results revealed the characteristic vibration bands present in the synthesized phosphor. Surface composition analysis of the prepared samples was examined using X-ray photoelectron spectroscopy (XPS). Photoluminescence emission band observed at 589 nm was assigned to 5D excited level corresponding to ²F_5/2 transition in yellow region under the excitation wavelength of 320 nm. Yellow light emission was confirmed by the Commission Internationale de L’Eclairage (CIE) chromatic coordinate graph. The synthesized phosphors BAO: 0.5Ce³⁺, BAO: 0.5Ce³⁺, 0.1Li⁺ displayed a color purity and lifetime decay of 78.4%, 81.3% and 4.333 ns, 4.738 ns, respectively.