01723nas a2200157   4500008004100000022001400041245015300055210006900208260000900277300001100286490000800297520108600305100001601391700002701407856013101434       2021                        eng d  a0021-960600aDeciphering the role of temperature in Li+ co-dopant occupancy in BaYF5:Yb3+,Er3+ up-converting nanocrystals and its structure-property relationship0 aDeciphering the role of temperature in Li codopant occupancy in   cMAR   a0947070 v1543 a<p>Precision engineering of defects in luminescent nanoscale crystalline materials with lesser controls to design is an area of interest in engineering materials with desired properties. Li+ co-doped BaYF5 nanocrystals were engineered, and temperature as controls for determining the co-dopant occupancies in the host lattice is studied. An observed enhancement in the up-conversion photoluminescence results from the co-dopant occupancy at Ba2+ sites via substitution through the hot injection method, whereas for samples prepared using co-precipitation, photoluminescence quenching was observed, which can be correlated with the Li+ occupancy at the interstitial site near Er3+ and also due to the incorporation of OH-. The crystal lattice deformation as a result of doping and the mechanism for the observed enhancement/quenching of luminescence are studied using x-ray diffraction, x-ray photoelectron spectroscopy, and energy transfer mechanism. Cytotoxicity assay and photoluminescence studies of the synthesized nanocrystals confirm that the material is biocompatible.</p>
1 aDevi, Suman1 aLuwang, Meitram, Niraj  uhttps://library.ncl.res.in/content/deciphering-role-temperature-li-co-dopant-occupancy-bayf5yb3er3-converting-nanocrystals-and