Structural and spectroscopic features of single-phase Dy³⁺ activated BiYWO₆ phosphor for luminescent device applications

Dysprosium-activated bismuth yttrium tungstate (Dy³⁺: BiYWO₆) phosphors have been synthesized in an ambient atmosphere using a co-precipitation (CP) method. X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) with energy dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) measurement techniques were employed to examine the structural, compositional, morphological, elemental composition as well as their oxidation states, and photoluminescent characteristics of the Dy³⁺: BiYWO₆ phosphors, respectively. PL studies of the Dy³⁺ activated BiYWO₆ phosphor manifests the CIE color coordinates phosphor falls in near white and yellow regions under 290 and 455 nm wavelengths, respectively. The average decay time ( \(\:{\tau\:}_{avg}\) ) for the ⁴F_9/2 energy state of Dy³⁺ ions has been found to be in microseconds. The PL spectra measured from room temperature to 448 K ensure good thermal stability of the phosphor. Thus, the synthesized phosphor might be a probable contender for UV/blue excited phosphor-converted white LEDs (pc-WLEDs).