Details

Autor(en) / Beteiligte

• Sharma, Manisha
• Singh, Priyam
• Singh, Sunil Kumar
• Singh, Prabhakar

Titel

Li+ aided self-activated Ca9Y1−x−yErxYby(VO4)7 phosphors for efficient dual-mode emission and temperature sensing application

Ist Teil von

• Optical materials, 2022-11, Vol.133, Article 112925

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• For the first time, lanthanide co-doped self-activated Ca9Y1−x−yErxYby(VO4)7 phosphors have been investigated for bearing dual-mode emission: downshifting and upconversion emission behavior. The Ca9Y1−x−yErxYby(VO4)7 phosphor, under 379 nm excitation evinces two bright green emission peaks at 525 nm and 553 nm, which corresponds to H11/22,S3/24→I15/24 transitions of Er3+ ion, this transition is sensitized by an efficient energy transfer from the (VO4)3− group to Er3+ ions. Irradiated with a 980 nm power tunable laser, it shows strong green and comparatively weak red emissions bands. The upconversion emission can be enhanced enormously with the introduction of Li+ ions in the optimized Ca9Y0.847Er0.003Yb0.15(VO4)7 phosphor. Furthermore, utilizing the well-known fluorescence intensity ratio (FIR) technique, optimized Ca9Y0.647Li0.20Er0.003Yb0.15(VO4)7 phosphor has been explored for optical temperature sensors also. The maximum absolute sensitivity and relative sensitivity are obtained to be 0.0125 K−1 at 513 K and 0.012 K−1 at 300 K, respectively. The acquired result reveals that the phosphor Ca9Y0.647Li0.20Er0.003Yb0.15(VO4)7 can be a worthy material for temperature sensing application. [Display omitted] •Synthesis of Li + doped Ca9Y1-x-yErxYby(VO4)7 by sol-gel combustion method.•Charge transfer transition of (VO4)3- group in Ca9Y1-x-yErxYby(VO4)7.•First observation of upconversion emission in Ca9Y1-x-yErxYby(VO4)7 phosphor.•The influence of Li + doping on the upconversion emission.•Li + doped Ca9Y1-x-yErxYby (VO4)7 shows high optical temperature sensitivity.