Synthesis And Luminescence Investigation Of Sba-15/Nayf4:Yb/Er Composites

One of the main approaches toward obtaining efficient up converting materials with practical applications involves the development of composites with synergism between components. Herein, we reported an optical temperature sensing using up-conversion fluorescence emission at 530 and 550 nm in the Er3+/Yb3+-co-doped NaYF4 nanoparticles and SBA-15/NaYF4:Yb,Er composites excited at 976 nm. Nanoparticles and composites were prepared and investigated by X-ray diffractometry, N2 adsorption-desorption isotherms, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and up-conversion photoluminescence. Spherical like NaYF4:Yb,Er nanoparticles exhibited a mixture of hexagonal and cubic phases, while the rare earth ions incorporated inside of SBA-15 mesopores crystallized in a cubic phase. Optical thermometry property was investigated in the temperature range from 30 to 90 degrees C, and a maximum absolute sensitivity were 0.03/degrees C and 0.38/degrees C for nanoparticles and composites, respectively. The lower temperature range makes the composites with potential for application in biological systems.[GRAPHICS].