Controlled Fabrications Of Rare Earth Doped Barium-based Nanomaterials And Study On Optical Properties

Rare-earth doped nanomaterials have become a frontier research in the current scientific field due to their unique intra 4f transitions.In the current development process,the structure of the nanocrystals were controlled by rare earths doping,it will bring about the effects of concentration quenching.At the same time,the rare earth ions can provide the appropriate oscillation level required for generating the laser light,which is also a laser-activating ion with excellent performance at present.In this paper,we select suitable based-materials and prepare nanocrystals by doping with rare earth ions to study the mechanism of changing the structure and optical properties of nanocrystals.The main content is as follows:?1?Barium carbonate was selected as the first matrix material.The different structures of BaCO₃:x%Tb?x=1,3,5?nanocrystals were synthesized by doping a small amount of Tb³⁺into the host material lanthanum carbonate nanocrystals.We have discussed the mechanism that influences the effect of a small amount of actinide doping on crystal size and morphology.The nanocrystals with these different structures have excellent luminescence properties,and we can find that there may be energy transfer from the BaCO₃ host to the Tb³⁺ion in BaCO₃:x%Tb by measuring the emission and excitation of the fluorescence spectrum and the fluorescence lifetime.?2?The?-BaB₂O₄ nanomaterial was selected as the second matrix material.The?-BaB₂O₄ nanocrystals were prepared by a simple hydrothermal method,and the?-BaB₂O₄ nanowires with good morphology were obtained by adjusting the pH of the solution;To determine the optimal temperature of?-BaB₂O₄ to?-BaB₂O₄ phase transition,the?-BaB₂O₄ nanowires were prepared at different temperatures?500°C,600°C,700°C and 750°C?calcinations.Finally,we obtained the?-BaB₂O₄ nanorods at 750°C.Subsequently,nonlinear optical properties of?-BaB₂O₄ were characterized.It was found that?-BaB₂O₄ can produce adjustable second harmonic emission in a wide spectral range?800 nm-1064 nm?.Characterization of nonlinear optical properties of?-BaB₂O₄:Tb nanocrystals revealed no self-multiplying signal peaks.This result may be due to the mismatch between the selected rare-earth ions and the material,which provides a certain theoretical and experimental basis for subsequent research.