Cation disorder in the phosphor lattice could be one of the effective approaches to modify the luminescence efficiency. In this work, cation substitutions of (Mo→ V) and (Na→ Mg) were conducted in the self-activated NaMgVO. All the samples of NaMgVMoO (x = 0, 0.01, 0.05, 0.1, 0.2, 0.3) were prepared via solid-state reaction. The morphological properties were measured via SEM and EDS analyses. Structural Rietveld refinement was performed to investigate the microstructure in the lattices. The cation substitution brings about structural disorder in the phosphor, which exerts great modifications in the luminescence properties. NaMgVO presents an intrinsic indirect transition with a band gap of 3.22 eV. The incorporation of Mo and Na in the lattices moves the optical absorption to a longer wavelength bringing about a narrower band gap. The luminescence intensity, thermal stability and corresponding lifetime were modified by the cation disorder in the self-activated phosphor.
A series
of carbene-containing dicarbonyl Re(I) bipyridyl complexes
with metal-to-ligand charge transfer (MLCT) transitions in the visible
region have been synthesized. Most of these complexes are highly selective
and efficient photocatalysts capable of using visible light for CO2 reduction to CO. The activities of single- and two-component
photocatalytic systems based on a series of carbene-containing dicarbonyl
Re(I) bipyridyl complexes as photocatalysts and photosensitizers have
been investigated. Importantly, the CO yields and turnover numbers
(TONs) can be further enhanced significantly in the two-component
photocatalytic systems. A detailed study suggests that the deactivations
of these photocatalyses arise from the photodegradation of the photosensitizers
or photocatalysts. The results suggest that efficient and robust rhenium-based
two-component photocatalytic systems can be developed by combining
an active rhenium(I) catalyst, which does not strongly absorb the
excitation light, for activating CO2 together with a highly
photostable photosensitizer with strong absorptivity for harvesting
excitation light.
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