Tailoring of upconversion luminescence of Al <sup>3+</sup> engineered titanate phosphor for non-invasive thermometry
Sasank Pattnaik, Vineet Kumar
Abstract
Abstract The ability of rare-earth-doped ferroelectric oxides to achieve outstanding upconversion (UC) performances under NIR irradiation despite possessing intrinsic electric properties drives researchers all over the globe to work in this field. The structural and spectroscopic characteristics of the Bi 4 Ti 3 O 12 phosphor integrated with Er 3+ , Yb 3+ , and Al 3+ have been thoroughly investigated in this study. The considerable increase in UC emission ∼three times caused by the addition of Al 3+ ions has been observed and discussed. The processes connected with the UC emission related to the pump power variation have been realized using the rate law equation. Aside from having high sensitivity of 0.011 K −1 at room temperature, the prepared phosphor possesses excellent thermal stability, i.e., it retains ∼73% of its initial intensity with the addition of Al 3+ ions.