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      https://www.ias.ac.in/article/fulltext/jcsc/129/12/1929-1940

    • Keywords

       

      Upconversion; optical contrast agents; catechin; square nanoplates; hydrothermal synthesis.

    • Abstract

       

      Yb ³⁺ -Er³⁺ codoped lanthanum upconverting nanostructures with varying concentration of dopants have been synthesized by catechin method. The prepared upconverting nanostructures were characterized through XRD,TEM,XPS, NIR absorption,TGAandDSCanalysis.TEMstudy confirms the formation of squareshaped nanoplates with size less than 100 nm. XPS peaks around 830–854eV further reveal the formation of LaF ₃ in the prepared samples. Frequency upconversion spectra from the developed nanostructures corresponding to the ²H₁₁/₂, ⁴S₃/₂ → ⁴ I₁₅/₂ and ⁴F₉/₂ → ⁴I₁₅/₂ transitions upon 980nm excitation are reported. Enhancement in the upconversion emission of catechin-based lanthanum nanostructures has been observed when compared with that prepared by ammonium di-n-octadecyldithiophosphate (AODTP) method.

    • Author Affiliations

       

      VAIRAPPERUMAL TAMILMANI1 ABHISHEK KUMAR SONI2 VINEET KUMAR RAI2 BALACHANDRAN UNNI NAIR1 KALARICAL JANARDHANAN SREERAM1

      1. Chemical Laboratory, CSIR-Central Leather Research Institute, Chennai, Tamilnadu 600 020, India
      2. Laser and Spectroscopy Laboratory, Department of Applied Physics, Indian Institute of Technology (ISM), Dhanbad, Jharkhand 826 004, India
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    • Supplementary Material

       
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