Quantum Confined High-Entropy Lanthanide Oxysulfide Colloidal Nanocrystals.

Quantum Confined High-Entropy Lanthanide Oxysulfide Colloidal Nanocrystals.
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DOI:
10.1021/acs.nanolett.2c01596
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发表时间:
2022-10-26
期刊:
影响因子:
10.8
通讯作者:
Lewis, David J.
Lewis, David J.
中科院分区:
材料科学1区
文献类型:
--
作者:
Ward-O'Brien, Brendan;McNaughter, Paul D.;Cai, Rongsheng;Chattopadhyay, Amrita;Flitcroft, Joseph M.;Smith, Charles T.;Binks, David J.;Skelton, Jonathan M.;Haigh, Sarah J.;Lewis, David J.

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We have synthesized the first reported example of quantum confined high-entropy (HE) nanoparticles, using the lanthanide oxysulfide, Ln2SO2, system as the host phase for an equimolar mixture of Pr, Nd, Gd, Dy, and Er. A uniform HE phase was achieved via the simultaneous thermolysis of a mixture of lanthanide dithiocarbamate precursors in solution. This was confirmed by powder X-ray diffraction and high-resolution scanning transmission electron microscopy, with energy dispersive X-ray spectroscopic mapping confirming the uniform distribution of the lanthanides throughout the particles. The nanoparticle dispersion displayed a significant blue shift in the absorption and photoluminescence spectra relative to our previously reported bulk sample with the same composition, with an absorption edge at 330 nm and a λmax at 410 nm compared to the absorption edge at 500 nm and a λmax at 450 nm in the bulk, which is indicative of quantum confinement. We support this postulate with experimental and theoretical analysis of the bandgap energy as a function of strain and surface effects (ligand binding) as well as calculation of the exciton Bohr radiii of the end member compounds.
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