Visible emissions through upconverting nanodots of NaYF4:Er3+; Yb3+ nanocrystals: a brief study in their upconversion mechanism and energy transfers

Abstract Here we report the formation of upconverting nanodots of Er3+/Yb3+ codoped NaYF4 nanocrystals confining diameter as calculated to be 3.4 ± 0.15 nm and are evolved as single crystalline particles with monodisperse particle size distribution. These nanodots are obtained with appearance of major cubic phases and minor prehoxagonal phases via thermal decomposition heat treatment. The bright green visible emissions for 2H11/2–4I15/2/4S3/2–4I15/2 energy transfers resulting from a three-photon excitation process, are obtained under 980 nm laser diode excitation sources, employed with an inexpensive diode laser with a maximum power density of about 150 mW/cm2. The synthesized nanodots are well characterized by high resolution transmission electron microscopy (HRTEM), X-ray diffraction study (XRD), Raman spectroscopic analysis, fluorescence spectroscopy for confirming their sizes, shapes; crystallinity; phases present and emissions respectively. Additionally, we also report the vis-vis photoluminescence (PL-study) under 450 nm excitations followed by two-photon excitation process. These nanocrystals are efficient enough to be dispersed in nonpolar organic solvents and could be of a great potential candidate for using as imaging probes or in fluorescent labels.

• Publication year

  2025

• Venue

  Chemical product and process modeling

• Publication date

  2025-07-14

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1515/cppm-2025-0042
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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