Characterization and luminescent properties of lanthanum borate prepared by solution combustion method

Abstract

A series of LaBO3:Pr3+ luminescent materials were prepared by using lanthanum nitrate hexahydrate (La(NO3)3·6H2O) and boric acid (H3BO3) as raw materials, glycine (C2H5NO2) as combustion agent and praseodymium nitrate hexahydrate (Pr(NO3)3·6H2O) as modifier. XRD, SEM, XPS, UV–vis DRS, PL and other characterization methods were used to analyze the phase structure, micro morphology and ionic valence of the luminescent materials, and the fluorescence properties of the materials were characterized in detail. The results showed that Pr3+ ions had entered into the lattice of LaBO3 after calcined at 850 °C for 4 h by solution combustion method. The macro particle size of the material was 790 nm, which belongs to submicron material. The valence state of rare earth ions was stable due to high temperature or other factors during the preparation process. The band gap of the powder was 6.62 eV. The fluorescence results showed that the main luminescence peak of LaBO3:Pr3+ powder was located at 670 nm at the excitation wavelength of 448 nm, and the luminescence intensity was the highest when the doping ratio was 0.03.