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    • VINEET KUMAR RAI

      Articles written in Journal of Chemical Sciences

    • Volume 129 Issue 12 December 2017 pp 1929-1940 REGULAR ARTICLE

      Frequency upconversion in catechin assisted LaF₃: Yb³⁺-Er³⁺ square nanoplates

      VAIRAPPERUMAL TAMILMANI ABHISHEK KUMAR SONI VINEET KUMAR RAI BALACHANDRAN UNNI NAIR KALARICAL JANARDHANAN SREERAM

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      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.

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