In the past, an Eu3+-doped YVO4 bulk phosphor
with a photoluminescence quantum yield (PLQY) of 70% was prepared
by a high-temperature solid-state reaction method at 1000 °C
for 5 h. In this work, ultrasmall Eu3+-doped YVO4 nanocrystals with a PLQY of 62% are rapidly synthesized by a facile
ligand-assisted coprecipitation method at room temperature. The reaction
is conducted under ambient conditions and is completed in 1 min. Water
and ethanol are used as the solvents, while short-chain butyric acid
and butylamine serve as the capping agents. As-prepared nanocrystals
are characterized by X-ray diffraction (XRD) and transmission electron
microscopy (TEM). The results show that Eu3+-doped YVO4 nanocrystals are well dispersed with a particle size of 3.6
nm. The luminescent nanocrystals prepared in this study have three
advantages: room temperature preparation, high PLQY, and ultrasmall
particle size. These results reveal that Eu3+-doped YVO4 luminescent nanocrystals could have high potential in lighting,
display, anti-counterfeiting, and bioimaging.
Rare earth‐doped metal oxide nanocrystals have a high potential in display, lighting, and bio‐imaging, owing to their excellent emission efficiency, superior chemical, and thermal stability. However, the photoluminescence quantum yields (PLQYs) of rare earth‐doped metal oxide nanocrystals have been reported to be much lower than those of the corresponding bulk phosphors, group II‐VI, and halide‐based perovskite quantum dots because of their poor crystallinity and high‐concentration surface defects. Here, an ultrafast and room‐temperature strategy for the kilogram‐scale synthesis of sub‐5 nm Eu3+‐doped CaMoO4 nanocrystals is presented, and this reaction can be finished in 1 min under ambient conditions. The absolute PLQYs for sub‐5 nm Eu3+‐doped CaMoO4 nanocrystals can reach over 85%, which are comparable to those of the corresponding bulk phosphors prepared by the high‐temperature solid state reaction. Moreover, the as‐produced nanocrystals exhibit a superior thermal stability and their emission intensity unexpectedly increases after sintering at 600 °C for 2 h in air. 1.9 kg of Eu3+‐doped CaMoO4 nanocrystals with a PLQY of 85.1% can be obtained in single reaction.
We developed a room-temperature and ultra-fast Eu3+ ion doping approach for the synthesis of highly luminescent Eu-doped CaMoO4 nanoparticles. Firstly, CaMoO4 nanoparticles with a particle size of 3.9 nm are...
Drop-on-demand inkjet printing is
used to deposit indium
tin oxide
(ITO) transparent and conductive thin films. ITO printable ink is
prepared by dissolving indium hydroxide and tin (IV) chloride into
ethanol with the assistance of acetic acid/tert-butylamine
ionic liquid. Ionic liquid-assisted ITO ink exhibits a complete wetting
behavior on the glass substrate and a tunable viscosity, which makes
it particularly suitable for the inkjet printing fabrication of ITO
thin films. After annealing at 500 °C in forming gas, ITO thin
films with a sheet resistance of 99 Ω/□, a resistivity
of 2.28 × 10–3 Ω·cm,
and a transmittance of 95.2% in the range of 400–1000 nm can
be obtained. The effects of annealing temperature on the resistivity,
mobility, carrier concentration, transmittance, and optical band gap
are investigated systematically. Compared with commercial ITO thin
films made by conventional vacuum-based deposition approaches, these
printable ITO thin films have a higher material utilization.
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