Abstract
Bifunctional Na(Y0.8-xDyxYb0.18Er0.02)F4(x = 0,5%, 10%, 15%, 20%, 25%, 30%) nanoparticles (NPs) are synthesized by the solvothermal method. Green and red upconversion emissions and the paramagnetic property simultaneously highly depend on Dy3+ content in Na(Y0.8-xDyxYb0.18Er0.02)F4 (x = 0, 5%, 10%, 15%, 20%, 25%, 30%). The tuning of upconversion emission intensity is resulted from the competition of the resonance energy transfer between Dy3+ and Er3+, transition possibility of Yb3+→ Er3+, and concentration quenching, which is depended on the doping level of Dy3+. It is found that the magnetization of Na(Y0.8-xDyxYb0.18Er0.02)F4 NPs nonmonotonously depends on the concentration of Dy3+ ions, which indicates that there may be the occurrence of the magnetic coupling of Dy3+ ions and antiferromagnetic coupling of Dy3+, Y3+, Yb3+, and Er3+ ions. The optimal content of Dy3+ ions for simultaneous control of photoluminescence emission and paramagnetic properties is 15%. These conclusions are important for tuning optical properties and magnetization in bifunctional NPs simultaneously.
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