Investigation of Structural, Optical, and Luminescence Properties BaBPO5 (BaBP):Dy3+ Phosphor for Solid-State Lighting Applications

A novel white-light-emitting BaBP:xDy³⁺ (x = 0.06, 0.08, 0.10, 0.12, and 0.14 mol%) phosphors were synthesized using a high-temperature solid-state reaction technique. The phase purity, structural, optical, and photoluminescence characteristics of the synthesized phosphor were studied using powder X-ray diffraction, high-resolution scanning electron microscopy, Fourier-transform infrared spectroscopy, Fourier-transform Raman spectroscopy, UV–Vis DRS, and photoluminescence spectroscopy. The excitation spectra were obtained at a wavelength of 575 nm, and several sharp peaks were observed in the 300–400 nm region, with a high-intensity peak at 348 nm, indicating potential excitation by the NUV chip. The photoluminescence spectra of all concentrations of Dy³⁺ ions were analyzed under an excitation wavelength of 348 nm. The emission spectra showed four prominent peaks at 472, 484, 574, and 664 nm, corresponding to the ⁴I_9/2 → ⁶H_15/2, ⁴F_9/2 → ⁶H_15/2, ⁴F_9/2 → ⁶H_13/2, and ⁴F_9/2 → ⁶H_11/2 transitions of Dy³⁺ ions. The Y/B ratio, concentration quenching, energy transfer mechanism, and cross-relaxation mechanisms were also studied. The CCT values fall within the neutral white to cool neutral white light range. The photoluminescence spectra and CIE chromaticity coordinates suggest that the prepared phosphor is a potential candidate for the manufacture of NUV-based WLEDs and solid-state lighting.