This study investigates the synthesis and optimization of SrAl 2 O 4 phosphors doped with Eu 2+ and co-doped with Eu 2+ /Dy 3+ for high-efficiency luminescent applications. These phosphors are of significant interest due to their applications in optoelectronics and anti-counterfeiting technologies. The synthesis was carried out using a high-temperature solid-state method, and the resulting phosphors were thoroughly characterized through fluorescence spectroscopy, X-ray diffraction (XRD), and CIE chromaticity coordinates. The results show that SrAl 2 O 4 : Eu 2+ exhibits the strongest luminescence with an excitation peak at 419 nm and emission at 514 nm, with the optimal Eu 2+ doping concentration found to be 0.1 mol. For the co-doped system SrAl 2 O 4 : Eu 2+ /Dy 3+ , the maximum luminescence intensity was achieved at aDy 3+ concentration of 0.01 mol. First-principles density functional theory (DFT) calculations indicated that Dy 3+ doping reduces the material’s band gap, affecting the electronic structure and dielectric properties, which enhances UV absorption. The optical properties, including the absorption coefficient, reflectivity, refractive index, and extinction coefficient, were calculated, revealing that Dy 3+ doping improves the UV absorption and optical performance, particularly in the far-ultraviolet region. In practical applications, the phosphor powders were incorporated into screen-printable inks, showing bright green luminescence under UV excitation at 365 nm. These findings offer both experimental and theoretical insights for the design and optimization of high-performance luminescent materials for various applications.
Chen et al. (Thu,) studied this question.