Broadband Shortwave Infrared-Emitting Cr- and Ni-Codoped YAlGaO Phosphor with Excellent Thermal Stability for Multifunctional Applications.

Shortwave infrared (SWIR)-emitting materials have emerged as superior light sources with increasing demand for potential applications in noninvasive analysis, night vision illumination, and medical diagnosis. For developing next-generation SWIR phosphor-converted light-emitting diodes (pc-LEDs), the scarcity of intense blue-light-pumped broadband SWIR luminescent materials and poor thermal stability of current Ni-activated phosphors are the ongoing challenges. Here, a blue-light-excitable (440 nm) YAlGaO:Cr,Ni phosphor with ultrawide SWIR emission centered at ∼1430 nm (FWHM ∼264 nm) is reported.

Er-activated BaVO upconversion nanosheets for dual-mode temperature sensing.

So far, there has been substantial research on non-contact luminescence thermometry approaches that rely on luminescence intensity ratio (LIR) technology. However, there is limited availability of phosphors doped with Er ions that exhibit on-par luminescence and high sensitivity. In this work, samples of BaVO:Er were synthesized using a sol-gel method aided by citric acid.

Upconversion Nanodevice-Assisted Healthy Molecular Photocorrection.

Mushrooms are rich in ergosterol, a precursor of ergocalciferol, which is a type of vitamin D. The conversion of ergosterol to ergocalciferol takes place in the presence of UV radiation by the cleavage of the "B-ring" in the ergosterol. As the UV radiation cannot penetrate deep into the tissue, only minimal increase occurs in sunlight.

Excitation dependent visible and NIR photoluminescence properties of Er, Yb co-doped NaBi(MoO) nanomaterials.

Due to the exceptional luminescence properties of lanthanide doped nanomaterials, they have applications in various field such as sensing, photocatalysis, solar cells, bio-imaging, therapy, diagnostics, anti-counterfeiting, latent fingerprint development, optical amplifiers, solid state lighting, Here, we report the excitation dependent photoluminescence properties of Yb, Er co-doped NaBi(MoO) nanomaterials in both the visible and NIR regions upon UV, visible and NIR excitation. These photoluminescence properties show that strong energy transfer occurs from the host to the Yb, Er ions. These materials show major emission bands at 530, 552 (green) and 656 nm (red) in the visible region and 1000 and 1534 nm in the NIR region.

Synthesis of LaFeO/AgCO Nanocomposites for Photocatalytic Degradation of Rhodamine B and -Chlorophenol under Natural Sunlight.

Novel LaFeO/AgCO nanocomposites are synthesized by co-precipitation method for photocatalytic degradation of Rhodamine B (RhB) and -chlorophenol under visible light irradiation. Heterostructures between LaFeO and AgCO semiconductors are formed during the synthesis of these nanocomposites. Among the nanocomposites prepared with different ratios of LaFeO and AgCO, 1% LaFeO/AgCO shows the highest photocatalytic activity for the degradation of RhB.

Liquid metal/metal oxide frameworks with incorporated Ga2O3 for photocatalysis.

Solvothermally synthesized Ga2O3 nanoparticles are incorporated into liquid metal/metal oxide (LM/MO) frameworks in order to form enhanced photocatalytic systems. The LM/MO frameworks, both with and without incorporated Ga2O3 nanoparticles, show photocatalytic activity due to a plasmonic effect where performance is related to the loading of Ga2O3 nanoparticles. Optimum photocatalytic efficiency is obtained with 1 wt % incorporation of Ga2O3 nanoparticles.

BiPO4: a better host for doping lanthanide ions.

In the present manuscript it is demonstrated that BiPO(4) is a better alternative to lanthanide phosphate host for making lanthanide ion-based luminescent materials. Hexagonal and monoclinic forms of BiPO(4) phase were prepared based on the reaction of Bi(3+) and PO(4)(3-) ions in ethylene glycol medium at 100 and 185 °C, respectively. From the differential thermal analysis (DTA) studies it is confirmed that the difference in the nucleation mechanism rather than the phase transition is responsible for the monoclinic phase formation at low temperatures (125 °C).

Investigations of Ce3+ co-doped SbPO4:Tb3+ nano-ribbons and nanoparticles by vibrational and photoluminescence spectroscopy.

Nano-ribbons and very small nanoparticles (size 2-5 nm) of SbPO4 doped with lanthanide ions (Ce3+ and Tb3+) are prepared at a relatively low temperature of 120 degrees C based on a solution method. Detailed vibrational and luminescence studies on these samples establish that these lanthanide ions are incorporated at Sb3+ site of the SbPO4 lattice. The excitation spectrum corresponding to the Tb3+ emission and the excited state lifetime of the 5D4 level of Tb3+ ions in the sample confirm the energy transfer from Ce3+ to Tb3+ ions in the SbPO4 host.

Lanthanide-ion-assisted structural collapse of layered GaOOH lattice.

GaOOH nanorods were prepared by hydrolysis of Ga(NO(3))(3)·xH(2)O by urea at ~100 °C in the presence of different amounts of lanthanide ions like Eu(3+), Tb(3+), and Dy(3+). On the basis of X-ray diffraction and vibrational studies, it is confirmed that layered structure of GaOOH collapses even when very small amounts of lanthanide ions (1 atom % and more) are present in the reaction medium during the synthesis of GaOOH nanorods. The incorporation of lanthanide ions at the interlayer spacing of the GaOOH lattice, followed by its reaction with OH groups that connect the layers containing edge-shared GaO(6) in GaOOH, is the reason for the collapse of the layered structure and associated amorphization.

Luminescence studies on SbPO4:Ln3+ (Ln = Eu, Ce, Tb) nanoparticles and nanoribbons.

Nanoparticles and nanoribbons of SbPO4 and lanthanide ions (Eu3+, Ce3+ and Tb3+) doped SbPO4 were prepared at a low temperature of 120 degrees C by co-precipitation method in solvents like ethylene glycol and glycerol. By varying the relative ratios of the two solvents, average crystallite size of SbPO4 has been varied over a range of 12 to 46 nm. Based on steady state luminescence studies, existence of energy transfer between host SbPO4 and lanthanide ions has been confirmed.