研究目的
The objective of the present investigation is to focus on the not-so-well known field of inorganic luminescent materials, specifically on the synthesis, characterization, and spectral analysis of highly monodisperse and naturally self-assembled ultrathin, europium-doped yttrium oxide nanodiscs (NDs).
研究成果
The study concludes that ultrathin nanodiscs of Y2O3:Eu3+ can be fabricated in a reproducible, facile, and self-assembling process. The crystal field in these nanoparticles deviates from both cubic and monoclinic characteristics. The concentration quenching of the Eu3+ luminescence is largely suppressed in non-annealed NDs, possibly due to a reduction of the phonon density of states.
研究不足
The study acknowledges the challenges in synthesizing well-defined, monodisperse, and crystalline nanomaterials. The actual line broadening and shape of the spectra of Y2O3:Eu3+ NCs depend on both the synthesis method and the stabilizing compounds used. A theory predicting the changes of a spectrum of rare earth-doped material from micrometre-sized powder to NCs does not exist.
1：Experimental Design and Method Selection
The synthesis was performed using air-free techniques under purified nitrogen. Europium acetate hydrate and yttrium acetate hydrate were introduced in a mixture of trioctylamine and oleic acid, heated, and then oleylamine was added before vacuum purification. The mixture was heated to 300 °C for 60 min.
2：Sample Selection and Data Sources
Samples with varying europium concentrations were prepared, maintaining the total quantity of Eu and Y at 0.6 mmol.
3：List of Experimental Equipment and Materials
Europium acetate hydrate (99.9%), yttrium acetate hydrate (99.9%), trioctylamine (98%), oleic acid (technical grade, 90%), Oleylamine (technical grade 80%–90%), absolute ethanol, toluene, and n-hexane were used.
4：Experimental Procedures and Operational Workflow
The synthesis involved dissolving the acetates in a mixture of N(Oct)3 and OA, heating, adding OAm, vacuum purification, adding glacial acetic acid, and heating to 300 °C. The NDs were recovered and purified by adding ethanol, centrifuging, and dispersing in toluene.
5：Data Analysis Methods
The samples were characterized using TEM, SAXS, PL excitation and emission spectra, laser-induced fluorescence spectra, PDF and WAXS measurements.
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