Synthesis And Properties Explorations Of Several Luminescent Materials With Rare Earth Ions And Defects As Emission Centers

Inorganic luminescent material is an important part of the materials because of its various categories and predominat physical and chemical properties. It has been used in displays, lightings, clinical diagnosis, and so on. However, with the development of science and technology and the improvement of living standards, the requirements of the luminescent materials and practical applications are also growing. Therefore, the investigation and development of novel and effective inorganic luminescent materifals have become a hot spot in the materials science.This study focuses on two types of inorganic luminescent nano-materisals: defect-related luminescent materials and rare-earth luminescent materials. Firstly, Monodisperse silica nanospheres with a narrow size distribution were prepared by a soft-template method, followed by heat treatment. The annealed silica samples with a narrow size of 100 nm exhibited broad, intense visible luminescence. As a drug carrier, the loading and releasing capacity of ibuprofen（IBU） were also presented. The result indicates that the defect-related luminescent silica nanospheres show a drug loading and controlled release properties for IBU. In addition, the emission intensity of annealed silica in the drug carrier system increases with the cumulative released amount of IBU. Therefore, this luminescent material may be potentially applied in the drug delivery and disease therapy fields.Secondly, BaGdF₅:Ce³⁺, Ln³⁺( Ln³⁺ = Tb³⁺, Eu³⁺) nanoparticles which was a kind of rare-earth luminescent material were fabricated by hydrothermal process. The Cit^3- made a significant impact on the morphology and size of products. The emission colors of the as-prepared samples can be tuned by adjusting the doping amounts of Tb³⁺ and Eu³⁺. Thirdly, well-defined Na La（WO₄）₂:Ln³⁺(Ln³⁺ = Dy³⁺, Sm³⁺, Eu³⁺, Tb³⁺) crystals with uniform size and morphology have been successfully synthesized by solvothermal method. The luminescent properties and the formation mechanism were also discussed.