Self-aggregating calix[4]arenes carrying four DOTA ligands on the upper rim for stable complexation of paramagnetic GdIII-ions have already been proposed as MRI probes. In this work, we investigate the luminescence properties of TbIII-DOTA-calix[4]arene-4OPr containing four propyl-groups and compare them with those of the analog substituted with a phthalimide chromophore (TbIII-DOTA-calix[4]are...

To investigate the effect of Mn and other metal dopants on photoelectronic performance CsPbCl3 perovskites, we conducted a series theoretical analyses. Our findings showed that after mono-doping, lattice contracted bonding strength increased, resulting in more compact structure octahedral cage. The relaxation cage, along with Jahn–Teller effect, results decrease strain between octahedra reducti...

The effect of Yb3+ co-doping on relaxation dynamics excited states Er3+ ion in oxyfluoro tellurite (TZYN) glasses was demonstrated employing excitation and luminescence spectroscopy. up-conversion spectra were studied as a function temperature the 298–633 K range, fluorescence intensity ratio (FIR) for green bands due to 2H11/2 ? 4I15/2 4S3/2 transitions against determined. sensing performance ...

Highly transparent and luminescent CaMoO4:Eu/Ag composite films were fabricated on glass substrates as multifunctional antireflective (AR) coatings. The films were deposited through a combination of a sol–gel dip-coating technique and a hot water treatment. With the addition of an aluminum source in coating solutions, the sol–gel-derived films underwent a remarkable microstructural change durin...

Direct-bandgap semiconductor with high quantum radiative efficiency can operate as a scintillator despite being ‘‘opaque’’ to its own luminescence. An interband absorption does not finish off the luminescence but merely creates a new minority carrier, which in turn recombines in a predominately radiative fashion. To take full advantage of this ‘‘photon recycling’’ effect, optically-tight integr...

Filaments produced in air by intense femtosecond laser pulses emit UV luminescence from excited N(2) and N(2)(+) molecules. We report on a strong dependence at high intensities (I≥1.4×10(14)  W/cm(2)) of this luminescence with the polarization state of the incident laser pulses. We attribute this effect to the onset of new impact excitation channels from energetic electrons produced with circul...

Laser cooling in semiconductor structures due to anti-Stokes luminescence is reviewed. Theoretical background considering luminescence trapping and red-shifting, the effect of free carrier and back-ground absorption, Pauli bandblocking, and the temperature-dependence of various recombination mechanisms are discussed. Recent experimental results demonstrating record external quantum efficiencies...

The interaction between semiconductor nanowires (NWs) and metallic nanocolloids were studied upon bioconjugation of two biomaterials: d-biotin and streptavidin. 5-fold intensity enhancement of luminescence and a blue shift of the emission peak were observed after conjugation with Au NPs. It can be interpreted in terms of the electromagnetic field enhancement effect in the presence of metallic N...

In this research work, we report a simple method called reflux condensation method for synthesizing Co3O4 nanoparticles using cheap chemicals such as, cobalt acetate (precursor salt), sodium monododecyl sulphate - SDS (surfactant) and N, N - Dimethylformamide - DMF (solvent). The prepared materials were heat treated at 200, 400, 600 and 800 oC for each 2 h to get phase pure product. The calcine...

We developed a novel spin-labeled terbium complex Tb(3+)/cs124-DTPA-TEMPO (1) by covalently labeling a nitroxide radical on the terbium complex for monitoring free radicals of various areas. This lanthanide complex probe shows a high EPR signal which resulted from the nitroxide radical moiety, and is weakly luminescent which resulted from the intramolecular quenching effect of the nitroxide rad...