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

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). Sr3La1-x(PO4)(3): xDy(3+) (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 degrees 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 F-4(9/2)-> H-6(15/2) responsible for blue light emission and the peak at 574 nm is for electric-dipole transition characteristic to F-4(9/2)-> H-6(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 angstrom which eventually illustrated the existence of multipolar interactions between Dy3+ ions. CCT value (7908 K) and CIE coordinates (0.292, 0.320) of Sr3La0.97Dy0.03(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.