Luminous LaAlO<sub>3</sub>:Dy<sup>3+</sup> perovskite nanomaterials: Synthesis, structural, and luminescence characteristics for white light‐emitting diodes
Pawan Kumar, Sitender Singh, Isha Gupta, Vinod Kumar, Devender Singh
Abstract
Abstract A single‐phase perovskite LaAlO 3 :Dy 3+ 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 LaAlO 3 :Dy 3+ 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 LaAlO 3 :Dy 3+ phosphors make them potential materials for white light‐emitting diodes.