The applications of upconversion nanoparticles in biodetection,bioimaging,and lighting have greatly fuelled a growing demand for enhancing their brightness.The brightness of upconversion nanoparticles is fundamentally...The applications of upconversion nanoparticles in biodetection,bioimaging,and lighting have greatly fuelled a growing demand for enhancing their brightness.The brightness of upconversion nanoparticles is fundamentally limited by the low doping concentration of either activator or sensitizer ions,in spite of the progress of rational controlling nanoparticles to improve performance.Although NaYbF_(4)nano-particles possessing the largest amount of sensitizers(Yb^(3+))have been proposed as a promising alterna-tive host to achieve bright upconversion luminescence,systemic explorations in synthesizing NaYbF_(4)nanoparticles have scarcely been performed.In this work,we report the systematic synthesis and fine control of monodisperse NaYbF_(4)nanoparticles through a canonical high-temperature co-precipitation method.The phase and morphology of NaYbF_(4)nanoparticles can be rationally tuned,through modulat-ing the amount of NH4 F,amount of NaOH,temperature,and time,respectively.The heating rate has also been found to exert an effect on the phase and morphology evolution of NaYbF_(4)nanoparticles for the first time.The size of NaYbF_(4)nanoparticles can be modulated from hundreds to several nanometers,in addition to the variation of their phase and morphology.The optical properties of NaYbF_(4):Er upconver-sion nanoparticles obtained under different reaction parameters have been investigated,and moreover,their potential applications in imaging deep tissue and photodynamic therapy have been explored.Unravelling the phase and morphology evolution of NaYbF_(4)nanoparticles is expected to hold great potential for boosting the brightness of upconversion nanoparticles.展开更多
基金supported by the National Natural Science Foundation of China(21871139 and 21975122)Natural Science Foundation of Jiangsu Province,China(BK20191360).
文摘The applications of upconversion nanoparticles in biodetection,bioimaging,and lighting have greatly fuelled a growing demand for enhancing their brightness.The brightness of upconversion nanoparticles is fundamentally limited by the low doping concentration of either activator or sensitizer ions,in spite of the progress of rational controlling nanoparticles to improve performance.Although NaYbF_(4)nano-particles possessing the largest amount of sensitizers(Yb^(3+))have been proposed as a promising alterna-tive host to achieve bright upconversion luminescence,systemic explorations in synthesizing NaYbF_(4)nanoparticles have scarcely been performed.In this work,we report the systematic synthesis and fine control of monodisperse NaYbF_(4)nanoparticles through a canonical high-temperature co-precipitation method.The phase and morphology of NaYbF_(4)nanoparticles can be rationally tuned,through modulat-ing the amount of NH4 F,amount of NaOH,temperature,and time,respectively.The heating rate has also been found to exert an effect on the phase and morphology evolution of NaYbF_(4)nanoparticles for the first time.The size of NaYbF_(4)nanoparticles can be modulated from hundreds to several nanometers,in addition to the variation of their phase and morphology.The optical properties of NaYbF_(4):Er upconver-sion nanoparticles obtained under different reaction parameters have been investigated,and moreover,their potential applications in imaging deep tissue and photodynamic therapy have been explored.Unravelling the phase and morphology evolution of NaYbF_(4)nanoparticles is expected to hold great potential for boosting the brightness of upconversion nanoparticles.
