Abstract
Volume shrinkage upon heating is an uncommon phenomenon known as negative thermal expansion (NTE). NTE host Y2Mo3O12 (YMO) codoped with Er3+/Yb3+ and Er3+/Yb3+/Li+ ions were successfully synthesized for upconversion (UC) emission and optical thermometry studies. Upconversion using 980 nm laser stimulation resulted characteristic emissions of Er3+ion. The Li + codoping enhanced the UC emissions at room temperature by modifying the local environment around lanthanide ions. UC emission of both the phosphors were recorded at increasing temperature from 301 to 773K. The YMO: Er3+/Yb3+ phosphor shows enhanced UC emission with temperature due to the NTE feature of host lattice. Whereas, no such enhancement in UC emissions was observed for YMO: Er3+/Yb3+/Li+. Further, FIR based optical thermometry was studied for YMO: Er3+/Yb3+ phosphor using 2H11/2 (522 nm) and 4S3/2 (546 nm) levels of Er3+ ion. The maximum absolute and relative sensitivities are determined to be 22.60 × 10−3 K−1 and 11.16 × 10−3 K−1 at 303 K respectively. Results indicate that prepared phosphor can be used in prevention of thermal quenching as well as in temperature sensors.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
