NIR Light-triggered Green Emitting Perovskite-based Phosphor for Optical Thermometry and Future Molecular Logic Gate Applications

• Published in: Journal of fluorescence
• Main Authors: Kumar, Ishant, Kumar, Avinash, Kumar, Sandeep, Nair, Govind B., Swart, H. C., Gathania, Arvind K.
• Format: Journal Article
• Language: English
• Published: Netherlands 23.11.2024
• Subjects: Optical thermometry; Upconversion; Molecular logic gates; Phosphor
• ISSN: 1053-0509; 1573-4994; 1573-4994
• DOI: 10.1007/s10895-024-04044-6

Er and Yb doped CaTiO phosphors were synthesized via the solution combustion method and analyzed for structural, morphological, and optical properties using X-ray powder diffraction, field emission scanning electron microscopy, and photoluminescence spectroscopy. The Er ions showed green and red emissions when excited by a 980 nm infrared source. Power-dependent emission spectra were used to study the up-conversion process, and a rate equation model was proposed for clarity. For temperature sensing, the phosphor's temperature-dependent emission lines were examined between 303 and 583 K. This analysis was conducted using the fluorescence intensity ratio method. Relative sensitivities of 1.14%, 1.66%, 0.15%, and 0.33% K were observed for various thermally and non-thermally linked transitions. The phosphor also demonstrated potential for molecular logic gate applications, achieving switching ratios of ~ 170.86% for the AND gate and ~ 72.28% for the INHIBIT gate when heat and IR excitation were used as inputs. This material shows promise for both optical thermometry and future molecular logic devices.