Photoluminescence Studies of Rare Earth Doped Apatite Structured Phosphors

We developed novel phosphors based on Y₆Ba₄(SiO₄)₆F₂(YBSF) apatite doped with Dy³⁺. Phosphors with different doping concentrations of Dy³⁺ were prepared and their morphological, structural and spectral properties were analyzed. XRD pattern confirms the formation of Y₆Ba₄(SiO₄)₆F₂ apatite structured phosphors with space group P6₃/m and Debye scherrer formula gives the average crystalline size 33.4 nm. The morphological and topographical studies were done by FESEM and HRTEM analysis. EDX spectra show presence of all initial reactants in the final product. Photoluminescence spectra show two prominent peaks at 487 nm and 573 nm corresponding to magnetic dipole transitions (⁴F_9/2 → ⁶H_15/2) and electric dipole transitions (⁴F_9/2 → ⁶H_13/2) for 350 nm excitation wavelength. The chromaticity coordinate of the prepared phosphors was found to be in the region of near white light which shows that prepared phosphor are potential single phased phosphor for white light emitting diodes.