Structural and luminescent characteristics of orthorhombic GdAlO3:Sm3+ nanocrystalline materials for solid state lighting

In the current article, an eco-friendly, efficient and less energy consuming gel-combustion process has been used to develop a series of perovskite based Gd1-xAlO3:xSm3+ (x = 0.01, 0.03, 0.05, 0.07 and 0.09 mol) nanomaterials which produce reddish orange light. According to crystallographic investigation, the synthesized nanocrystalline materials belong to orthorhombic crystal symmetry having space group Pnma (62). The non-uniform agglomerated particles in nano range (35-45 nm) were examined via TEM analysis, which supports the results obtained from XRD analysis. The PL spectra involve 4f-transitions of trivalent samarium ions, such as 4G5/2 -> 6H5/2 (565 nm), 4G5/2 -> 6H7/2 (601 nm) and 4G5/2 -> 6H9/2 (647 nm). The energy transferal mechanism between neighbouring trivalent samarium ions is dipole-dipole (DD) interaction, which is answerable for the quenching of luminous intensity. Additionally, colorimetric characteristics like color coordinates, color-purity and correlatedcolor temperature were obtained using PL data. These photometric parameters were strongly recommends these synthesized nanophosphors samples for solid state lighting applications.

Automated summary

In this study, a gel-combustion process was used to synthesize perovskite based Gd1-xAlO3:xSm3+ (x = 0.01, 0.03, 0.05, 0.07 and 0.09 mol) nanomaterials which emit reddish orange light. The crystallographic investigation revealed that the synthesized nanocrystalline materials have orthorhombic crystal symmetry with space group Pnma (62). TEM analysis confirmed the presence of non-uniform agglomerated particles in the nano range (35-45 nm), consistent with the XRD analysis. The PL spectra showed 4f-transitions of trivalent samarium ions and the energy transfer mechanism between neighboring samarium ions was found to be dipole-dipole interaction. Colorimetric characteristics such as color coordinates, color-purity and correlated color temperature were obtained using PL data, suggesting these nanophosphor samples are highly suitable for solid state lighting applications.