RESUMO
The distinctive photophysical characteristics possessed by lanthanides, including europium, neodymium, and ytterbium, render them adaptable molecular tools for studying biological systems. Specifically, their enduring photoluminescence, precise emission spectra, and significant Stokes shifts allow for experiments not achievable with organic fluorophores or fluorescent proteins. Moreover, the capacity of these metal ions for luminescence resonance energy transfer and photon upconversion extends the potential applications of lanthanide probes even further. In this research, a new [Nd(NTA)2·H2O]3- complex was synthesized and its optical properties were assessed using practical characterization techniques such as UV-Vis absorption, photoluminescence, and FTIR. It was discovered that when the sample was excited by a 357 nm wavelength, it emitted a strong line at 1076 nm with a full-width at half maximum (FWHM) of 10 nm, a phenomenon not previously documented. The Judd-Ofelt theory and its intensity parameters were utilized in a theoretical approach to determine the fluorescence branching ratio and the radiative lifetime of the [Nd(NTA)2·H2O]3- complex. The absorption and luminescence spectra were then analyzed accordingly. Experimental findings validated the potential applications of the prepared sample in bioimaging.
RESUMO
Yttrium oxide nanoparticles are one of the proper host materials for rare-earth elements. The rare-earth ions doped in yttrium oxide nanoparticles have medical applications such as biological imaging and photonic applications such as waveguides in the infrared region, laser mediums, sensitizers, LEDs, etc. The preparation of rare-earth ion-doped Y2O3 nanoparticles is usually done through the solid-state process and at a very high temperature, such as 1200 °C. In this research, using the solid-state process and during multi-step heat treatment at temperatures of 210 °C, 380 °C, and 500 °C, white nanopowders of Nd:Y2O3were prepared in 6 h. The produced nanopowders were studied using various characterization methods. The results showed that the produced nanopowders have a cubic structure and an average particle size between 22 and 65 nm.
