The accuracy and precision of micro-analysis of sulfur (S), chlorine (Cl) and bromine (Br) in quartz-hosted fluid inclusions by laser ablation (LA) inductively coupled plasma mass spectrometry (ICP-MS) was tested. A scapolite mineral sample (Sca17) can be used as standard reference material (SRM) for the determination of Cl and Br, and NIST610 glass for S determination in fluid inclusions. We found that laser ablation of quartz and UV irradiation in the ablation cell produced elevated background signals of S and to a lesser amount of Cl and Br due to remobilization of these elements from the inside surfaces of the ablation Page 2 chamber. Careful cleaning of the ablation chamber with nitric acid and by UV irradiation results in a 10 times lower S contamination signal and improves fluid inclusion analysis by reducing the detection limit for S by 50%. Micro-analysis of liquid and vapor inclusions synthesized in two different laboratories produce good accuracies of S, Cl, and Br. Analytical uncertainties based on numerous analyses of individual synthetic fluid inclusions in one assemblage are 17-44 % (RSD) for the sulfur concentration, and 6-26 % for Br/Cl ratios. Limits of detection (LOD) in 30 μm diameter liquid inclusions with densities of 0.99-1.02 g/cm 3 are in the range of 60 μg/g for S, 250 μg/g for Cl, and 15 μg/g for Br. LOD's in similar sized vapor inclusions with a density of 0.33 g/cm 3 are at least an order of magnitude poorer. Based on the investigated natural brine inclusion assemblages, the precisions of Br/Cl ratios (4-9 % RSD) is adequate to determine the source of salinity in different ore-forming fluids.
Low-dimensional copper
halides with high luminance have attracted
increasing interest as heavy-metal-free light emitters. However, the
optical mechanisms underpinning their excellent luminescence remain
underexplored. Here, we report multiple self-trapped emissions in
Cs3Cu2I5. Power-dependent photoluminescence
spectra reveal the appearance of multiple self-trapped emission peaks
with increasing excitation power, and this emission behavior is explored
across a temperature range of 80–420 K. The zero-dimensional
structure and soft crystal lattice contribute to the multiple self-trapped
emissions in Cs3Cu2I5: this explains
the origin of the broad emission and the luminescence mechanism in
Cs3Cu2I5 and will assist in improving
our understanding of the optical properties of other metal halides.
We incorporate the Cs3Cu2I5 in light-emitting
diodes that achieve a peak luminance of 140 cd/m2 and an
external quantum efficiency of 0.27%.
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