Cool White-light Emanation Via Combustion Produced Sr₃La(PO₄)₃: Dy³⁺ Single-phased Nanophosphors for Effective...

Rare earth-doped nanophosphors have gained the attention of scientist as a result of their application in many devices like color display, laser cooling, bioimaging, and especially white light emitting diodes (WLEDs). Sr₃La_1-x(PO₄)₃: xDy³⁺ (x = 0.01 to 0.15 mol) white light emitting nanophosphors were synthesized by a resourceful and effective technique which is solution combustion synthesis utilizing urea as fuel at 1200 °C and their photoluminescence and structural properties were inspected using powder X-ray diffraction (PXRD) spectroscopy, energy dispersive X-ray (EDAX) spectroscopy, Transmission Electron Microscopy (TEM) and photoluminescence (PL) spectroscopy. Rietveld refinement employing on XRD data disclosed that synthesized samples are of cubic lattice with I-43d (220) space group. The photoluminescence emission spectra revealed two main characteristic bands at 480 nm and 574 nm, the band at 480 nm has magnetic-dipole transition characteristic to ⁴F_9/2 → ⁶H_15/2 responsible for blue light emission and the peak at 574 nm is for electric-dipole transition characteristic to ⁴F_9/2 → ⁶H_13/2 answerable for yellow light emission. x = 0.03 mol was found to be the optimum concentration for the nanophosphors series and the critical transfer distance (R_c) was determined to be 25 Å which eventually illustrated the existence of multipolar interactions between Dy³⁺ ions. CCT value (7908 K) and CIE coordinates (0.292, 0.320) of Sr₃La_0.97Dy_0.03(PO₄)₃ nanophosphor confirmed their brilliant workability in the innovative optoelectronic devices, specifically single-phase WLEDs for the lighting purpose. So, this phosphor could be a potential component in near ultra-violet excited WLEDs.