Achieving orange red emission with high color purity from novel perovskite based Sr9Al6O18:Sm3+ nano-cubes for advanced optoelectronic applications

Abstract Novel cubic perovskite based orange red emissive Sr9(1-x)Al6O18: 9xSm3+ (0.001 ≤ x ≥ 0.04) nanocrystals were developed by environmentally benign and low temperature urea combustion method. Phase structure analysis showed the cubic structure with Pa 3 ‾ ( 205 ) space group. Scanning and transmission electron micrographs reported the agglomerated cubic morphology of the nanoparticles ranging from 40 to 60 nm. EDS (energy dispersive X-ray analysis) outcomes traced the adequate elemental composition of the spectral materials. The prepared nanomaterials displayed the fine orange red emission via 4G5/2 → 6H7/2 typical transition centered at 599 nm. Optical analysis asserted the wide band gap values of Sr8.82Sm0.18Al6O18 (3.77 eV) and Sr9Al6O18 (4.08 eV). Reliance of the emission intensity of developed nanophosphors on Sm3+ concentration claimed the Sr8.82Sm0.18Al6O18 as most desirable one with CIE coordinates (0.5833, 0.4159), 1747 K correlated color temperature (CCT) and color purity of 90.65%. These excellent results proved the relevancy of present nanophosphors as a novel promising material in the development of down conversion white LEDs. Also, the present research findings thus, can be well recurred to explore more about Sr9Al6O18 based spectral nanomaterials.