Organic electroluminescent materials have significant features such as active illumination, wide viewing angle, and high contrast. Rare earth organic complex electroluminescent materials are currently attracting the attention of researchers. In this paper, salicylaldehyde and benzoic acid derivatives are used as raw materials to synthesize salicylaldehyde p-methoxybenzoyl hydrazide (1-H2L) and salicylaldehyde p-methylbenzene by esterification, deuteration and Schiff base condensation. Synthesis of salicylaldoxime series lanthanum rare earth complexes with pyroglycol (2-H2L), salicylaldehyde-bromobenzoylhydrazide (3-H2L) ligands and Pr(NO3)3 as raw materials The structures of the complexes were characterized by infrared spectroscopy and ultraviolet spectroscopy. The ligand is a hydroxyl ν(OH) stretching vibration peak at 3 136～3 141 cm-1, which disappears in the infrared spectrum of the complex. The absorption peak of the complex between 3 330～3 368 cm-1 belongs to the crystallized H2O. The (OH) hydroxyl bending vibration absorption peak, the complex does not have an absorption peak at the hydroxyl group of 3 140 cm-1 corresponding to the ligand, and the absorption waveforms of the three ligands and complexes are similar, and the structure of the ligand and the complex are reacted basically consistent. However, the absorption peaks between the ligand and the complex have a large difference, and it can be inferred that the ligand has been coordinated. The fluorescence properties of the complexes were determined by fluorescence spectrophotometer. The effects of ligand substituents on the fluorescence intensity were discussed. The complexes can be excited by 470 nm blue light and have good red light emission at 608～617 nm. Such phosphors are expected to be applied on OLEDs.