Controlled Synthesis of BaYF5:Er3+, Yb3+ with Different Morphology for the Enhancement of Upconversion Luminescence

Abstract

In this work, Er 3+ /Yb 3+ -codoped BaYF 5 with different sizes and shapes have been synthesized by a simple solvothermal method. By changing the fluoride source, pH value, solvent, surfactants, Yb 3+ concentration, temperature, and reaction time, the optimum synthetic conditions of BaYF 5 :Er 3+ , Yb 3+ were found to improve the upconversion luminescent properties. It is found that the emission intensity of green and red light is enhanced for several times by the way of using NaBF 4 as a fluoride source with the comparison of NH 4 F and NaF. Moreover, the effects of different surfactants are not the same. Adding 5% polyetherimide (PEI) as surfactant can also improve the upconversion emission. On the contrary, when sodium citrate (CIT) as another surfactant was used to add, the sizes of the nanocrystals were gradually increased and the luminous properties also declined.

Multimodal PSSMA‐Functionalized GdF3 : Eu3+(Tb3+) Nanoparticles for Luminescence Imaging, MRI, and X‐Ray Computed Tomography

“…Moreover, EG, serving as both a solvent and capping agent, and POE regulate the particle morphology . The particles obtained from NaBF 4 , as the fluorine source, showed the highest luminescent emission efficiency and had a long lifetime due to their optimal crystal growth, which generated a uniform spherical shape . Eu and Tb were chosen as dopants to not only provide high color purity and photostability but also a suitable luminescence for nucleic acid structural probing …”

“…[15,20] The particles obtained from NaBF 4 , as the fluorine source, showed the highest luminescent emission efficiency and had a long lifetime due to their optimal crystal growth, which generated a uniform spherical shape. [21,22] Eu and Tb were chosen as dopants to not only provide high color purity and photostability but also a suitable luminescence for nucleic acid structural probing. [23][24][25] The morphology, size, and distribution of uncoated, PSSMAand POE-stabilized GdF 3 : Eu 3 + (Tb 3 + ) nanoparticles prepared in water and EG were analyzed by TEM.…”