A study of virescent emission from Er3+-activated ternary gadolinium-based nanophosphor system applicable for current pc-WLEDs and solid-state lightings.

Green-emitting BaSrGd₄O₈: Er³⁺ nanophosphor is effectively synthesized using the solution combustion route. For crystallographic and morphological attributes, the samples have been characterized by various techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The atomic parameters are refined with the aid of Rietveld refinement realization, and the orthorhombic phase with space group Pnma (62) is confirmed. EDS analysis reveals the chemical composition while SEM and TEM techniques confirm the irregular shapes. On near-UV excitation, the luminescence spectrum presents a fair green emission at 18,083 cm⁻¹ wavenumbers consistent with the electronic transition ⁴S_3/2 → ⁴I_15/2. Diffuse reflectance spectroscopy is used to examine the bandgap energy. Radiative lifetime, quantum efficiency, and rates of radiation-less electronic transitions are also examined. The CIE (Commission International de l'Eclairage) coordinates and hence the CCT (color coordinate temperature) values of the chromaticity plot are thus finalizing their potential contention in SSL (solid-state lighting) and other advanced optoelectronic applications. [ABSTRACT FROM AUTHOR]