Luminous LaAlO₃ :Dy³⁺ perovskite nanomaterials: Synthesis, structural, and luminescence characteristics for white light-emitting diodes

A single-phase perovskite LaAlO₃ :Dy³⁺ phosphor was synthesized using a gel-combustion method at 600°C utilization with hexamethylenetetramine as a fuel. Further calcination of the samples was carried out (800 and 1000°C) to investigate the resultant effect on the crystalline and luminescence behaviour. The crystal structure had a cubic unit cell (space group Pm3̅m) and was examined using the Rietveld refinement and X-ray diffraction data. Additionally, Debye-Scherrer and Williamson-Hall equations were applied to determine other structural features. The particle size and morphology of phosphors were evaluated using transmission electron microscopy. Diffraction measurements were supported by the various metal-oxygen vibration modes studied with the help of Fourier transform infrared spectroscopy. Energy-dispersive X-ray analysis verified the chemical composition of synthesized sample. Luminescence spectra of the LaAlO₃ :Dy³⁺ phosphors exhibited intense bands for ⁴ F_9/2 →⁶ H_15/2 (482 nm, bluish region) and ⁴ F_9/2 →⁶ H_13/2 (574 nm, yellowish region) transitions. Commission Internationale de L'Eclairage and correlated colour temperature data confirmed the cool-white emission of the samples under ultraviolet light excitation. The interesting and advantageous luminescence characteristics of LaAlO₃ :Dy³⁺ phosphors make them potential materials for white light-emitting diodes.