Cool-white illumination characteristics of combustion-derived novel single-phase Sr9Al6O18: Dy3+ nanomaterials for NUV induced WLEDs and solar cells

[Display omitted] •Novel single-phase cool-white-illuminating Sr9Al6O18:Dy3+ nanomaterials are fabricated via urea combustion.•Crystal lattice factors and refinement parameters are depicted by XRD- based Rietveld Technique.•Energy band gap, color purity, CCT and decay lifetime values have been calculated.•Potential candidate for NUV excited cool-white LEDs, sensors, solar-cells & laser devices. Novel cool-white-illuminating Sr9Al6O18:Dy3+ nanomaterials have been developed via a benign approach namely, solution-combustion; to bring out an upgradation in prevailing multi-phase W-LEDs. Rietveld-assisted XRD technique reveals cubic-perovskite lattice pertaining to Pa3¯(205) space-group. Down-conversion luminescence obtained by exciting nanomaterials at 354 nm near-UV light, in terms of blue peak (489 nm) and intense golden peak (578 nm), with admirable color-coordinates (0.2778, 0.2797), color purity (32.23 × 10−2) and CCT (10, 772 K). Therefore, all these results promised their appropriateness for optoelectronic applications like white-LEDs, sensors, bio-imaging and solar-cells. Also, the present outcomes can be well extended to invent more Sr9Al6O18-type materials.