Speaker
Description
Rare earth ion doped frequency up-conversion (UC) materials have attracted significant attention for various applications, such as light-emitting devices, energy conversion, optical heating, photocatalysis, temperature sensing, surface-enhanced Raman spectroscopy (SERS), and biomedical imaging [1–5]. The UC phenomenon is a well-established approach for converting near-infrared (NIR) light into visible light [1]. In practice, multiphoton absorption and energy-transfer processes are responsible for the generation of visible luminescence. The multifunctional behavior of these UC materials is currently a hot topic among researchers working in the field of lanthanide incorporated nanostructured optical materials. Here, the synthesis and characterization of few UC materials based on Er/Tm/Nd ions as activators are discussed. Fluorescence intensity ratio (FIR) based tuning, utilizing two thermally coupled energy levels or Stark sublevels, has been demonstrated for non-contact high temperature optical sensing and laser-induced optical heating. A facile preparation of a SERS substrate based on upconverting phosphors for the detection of harmful dye (RhB) is also reported [2]. Various radiative and non-radiative pathways have been investigated to understand the luminescence mechanism. The experimental studies carried out on these rare earth doped UC materials demonstrate their multifunctional applications.
References
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A. K. Soni et al., ACS Appl. Nano Mater. 4, (2021) 850.
A. K. Soni, A. Kumari, V. K. Rai, Sens. Actuator B 216 (2015) 64.