Eu³⁺-doped BLO (1–10 mol%) red light emitters were successfully developed via simple and efficient Solution Combustion (SC) method. Crystal structure analysis was carried out using X-ray diffraction (XRD) studies. Rietveld refinement analysis confirmed the pure rhombohedral phase [space group–R3 (146)] of BLEuO sample. The surface morphological and band-gap studies were carried out via scanning electron microscopy (SEM) and diffuse re-flectance (DR) measurements. Highly aggregated particles with irregular morphology in nano-range (60-80 nm) was observed in SEM analysis and the electron diffraction studies (EDS) confirmed the presence of all elements in optimum composition (5 mol%). Under 396 nm excitation, the dominant transition ⁵D₀ → ⁷F₂ at 621 nm is obtained which is responsible for red luminescence of Eu³⁺ ions. Critical distance between adjacent Eu³⁺ ions for energy transfer process was found to be 13.71 Å. The CIE color coordinates of 5-10 mol% samples lie close to that of standard red emission (0.6667, 0.3333) of NTSC system, and the CCT values lie in range from 1770 to 2700 K, which signifies the importance of Eu³⁺ doped nanophosphor in developing warm WLEDs for indoor lighting applications.

Combustion Synthesis, Rietveld Refinement, Photoluminescence, Decay Curves, Surface Morphology