Red-emitting Ca1-xSrxS:Eu2+ Phosphors as Light Converters for Plant-growth Applications

2011 ◽  
Vol 1342 ◽  
Author(s):  
Qi Xia ◽  
Miroslaw Batentschuk ◽  
Andres Osvet ◽  
Peter Richter ◽  
Donat P. Häder ◽  
...  
Keyword(s):  
Broad Band ◽  
Solar Spectrum ◽  
Solar Irradiation ◽  
Solid State Reactions ◽  
Photon Flux ◽  
Spectral Modification ◽  
Simulated Solar Irradiation ◽  
Photosynthetic Activities ◽  
The Eu ◽  
Spinach Leaves

ABSTRACTA series of Ca1-xSrxS:Eu2+y mol% phosphors were synthesized with solid state reactions and with various Ca/Sr ratio and Eu2+ doping concentrations. The influences of the lattice composition and the Eu2+ doping level on photoluminescent properties were analyzed. With doping concentrations between 0.1 to 3 mol%, concentration quenching takes place leading to the decrease of luminance; the emission maxima are also red-shifted. Further, this work reports enhanced photosynthetic activities of intact spinach leaves due to spectral modification of simulated solar irradiation by one synthesized phosphor (Ca0.4Sr0.6S:Eu1 mol%). The CO2 assimilation rates of intact spinach leaves were monitored with an effective homemade photosynthesis measurement system with controlled light conditions. The phosphor could efficiently convert the photosynthetically less active green part of the solar spectrum into the red, with a broad-band red emission centered at 650 nm and a halfband-width of 68 nm, giving an excellent match with the absorption spectrum of spinach chloroplasts. By careful referencing the photon flux, we found an enhanced photosynthetic activities by about 30 % due to the emission of the phosphor.

Fabrication of Semi-Transparent SrTaO2N Photoanodes with a GaN Underlayer Grown via Atomic Layer Deposition

2021 ◽  
Author(s):  
Can Lu ◽  
Nathan O´Brien ◽  
Polla Rouf ◽  
Richard Dronskowski ◽  
Henrik Pedersen ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Solar Spectrum ◽  
Atomic Layer ◽  
Solar Irradiation ◽  
Light Transmittance ◽  
Rear Side ◽  
Hydrogen Electrode ◽  
Layer Deposition ◽  
Pec Cells ◽  
Simulated Solar Irradiation

Quaternary metal oxynitride-based photoanodes with a large light transmittance are promising for high solar-to-hydrogen (STH) conversion efficiency in photoelectrochemical (PEC) tandem cells. Transparent substrates to support PEC water-splitting were fabricated using atomic layer deposition (ALD) to synthesize 30 and 60 nm GaN on SiC sub-strates. A generalized approach was used to grow a quaternary metal oxynitride, i.e. SrTaO2N thin film on the GaN/SiC substrates. The transparency above 60% in the wide solar spectrum highlights its availability of transmit-ting visible light to the rear side. A photocurrent onset at ca. −0.4 V vs. reversible hydrogen electrode (RHE) was achieved by the SrTaO2N/GaN/SiC photoanodes in a 0.1 M NaOH electrolyte under simulated solar irradiation. This paves the way for construction of hierarchically nanostructured tandem PEC cells. This work demonstrates the viabil-ity of integrating ALD in constructing substrates for semi-transparent quaternary metal oxynitride photoanodes.

A Thorough Investigation of Photo-catalytic Degradation of ortho and para-Nitro Phenols in binary mixtures: New Insights into Evaluating Degradations Progress Using Chemometrics Approaches

2021 ◽  
Author(s):  
S. Maryam Sajjadi ◽  
Zeinab Asadollah-pour ◽  
S. Hashem Sajjadi ◽  
S. Nasrin Nabavi ◽  
Zahra Abed ◽  
...  
Keyword(s):  
Binary Mixtures ◽  
Zno Nanoparticles ◽  
Catalytic Degradation ◽  
Solar Irradiation ◽  
Photo Catalyst ◽  
Decomposition Processes ◽  
Simulated Solar Irradiation ◽  
Photo Decomposition

In this study, photocatalytic degradations of 2-nitrophenol and 4-nitrophenol were carried out efficiently using ZnO nanoparticles photo-catalyst under simulated solar irradiation. The photo-decomposition processes were optimized simultaneously by employing central...

Photolytic degradation of quinalphos in natural waters and on soil matrices under simulated solar irradiation

Chemosphere ◽  
2006 ◽  
Vol 64 (8) ◽  
pp. 1375-1382 ◽  
Author(s):  
C. Gonçalves ◽  
A. Dimou ◽  
V. Sakkas ◽  
M.F. Alpendurada ◽  
T.A. Albanis
Keyword(s):  
Natural Waters ◽  
Solar Irradiation ◽  
Photolytic Degradation ◽  
Simulated Solar Irradiation

Rapid Degradation of Rhodamine B over Cyclodextrin Modified TiO2

2011 ◽  
Vol 694 ◽  
pp. 764-768
Author(s):  
Xu Zhang ◽  
Nan Sheng Deng
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Rhodamine B ◽  
Self Assembly ◽  
Initial Rate ◽  
Solar Irradiation ◽  
Pollutant Degradation ◽  
Rapid Degradation ◽  
Hybrid Nanomaterial ◽  
Simulated Solar Irradiation

A novel β-cyclodextrin (β-CD) grafted titanium dioxide (TiO2/β-CD) was synthesized through photo-induced self assembly methods, and its structure was characterized. The TiO2/β-CD hybrid nanomaterial showed high photoactivity under visible light irradiation (λ  400 nm and/or λ  420 nm) and simulated solar irradiation (λ  365 nm). Photodegradation of rhodamine B followed the Langmuir–Hinshelwood kinetics model. The initial rate R0 of rhodamine B degradation increased by 4.6, 2.4 and 1.5 times in the irradiation conditions of λ  420 nm, λ  400 nm and λ  365 nm, respectively. β-CD increased the lifetimes of the excited states of the unreactive guests and facilitated the electron transfer from the excited dye to the TiO2 conduction band, which enhanced the dye pollutant degradation.

g-C3N4 nanosheets decorated with carbon dots and CdS nanoparticles: Novel nanocomposites with excellent nitrogen photofixation ability under simulated solar irradiation

2019 ◽  
Vol 45 (2) ◽  
pp. 2542-2555 ◽  
Author(s):  
Hadi Diarmand-Khalilabad ◽  
Aziz Habibi-Yangjeh ◽  
Davod Seifzadeh ◽  
Soheila Asadzadeh-Khaneghah ◽  
Elham Vesali-Kermani
Keyword(s):  
Carbon Dots ◽  
Solar Irradiation ◽  
Cds Nanoparticles ◽  
Simulated Solar Irradiation

The critical role of light in moderating microbial stress due to mixtures of engineered nanomaterials

2018 ◽  
Vol 5 (1) ◽  
pp. 96-102 ◽  
Author(s):  
Carolyn M. Wilke ◽  
Jean-François Gaillard ◽  
Kimberly A. Gray
Keyword(s):  
Critical Role ◽  
Engineered Nanomaterials ◽  
Metal Nanoparticle ◽  
Toxic Effects ◽  
Solar Irradiation ◽  
Localized Surface Plasmon ◽  
E Coli ◽  
Simulated Solar Irradiation ◽  
Role Of Light

Light influences chemical interactions of engineered nanomaterials and their toxic effects. Under simulated solar irradiation, we observed that binary mixtures of n-Ag, n-Au, or n-Pt with n-TiO2cause synergistic toxic effects inE. colidue to photochemical interactions governed by metal nanoparticle stability and localized surface plasmon resonance.

scholarly journals Photocatalytic Activity and Optical Properties of Blue Persistent Phosphors under UV and Solar Irradiation

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
C. R. García ◽  
L. A. Diaz-Torres ◽  
J. Oliva ◽  
M. T. Romero ◽  
P. Salas
Keyword(s):  
Photocatalytic Activity ◽  
Annealing Temperature ◽  
Uv Light ◽  
Solar Irradiation ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Water Cleaning ◽  
Different Temperatures ◽  
The Eu

Blue phosphorescent strontium aluminosilicate powders were prepared by combustion synthesis route and a postannealing treatments at different temperatures. X-ray diffraction analysis showed that phosphors are composed of two main hexagonal phases: SrAl2O4and Sr3Al32O51. The morphology of the phosphors changed from micrograins (1000°C) to a mixture of bars and hexagons (1200°C) and finally to only hexagons (1300°C) as the annealing temperature is increased. Photoluminescence spectra showed a strong blue-green phosphorescent emission centered atλem=455 nm, which is associated with4f65d1→4f6  (8S7/2)transition of the Eu2+. The sample annealed at 1200°C presents the highest luminance value (40 Cd/m2) with CIE coordinates (0.1589, 0.1972). Also, the photocatalytic degradation of methylene blue (MB) under UV light (at 365 nm) was monitored. Samples annealed at 1000°C and 1300°C presented the highest percentage of degradation (32% and 38.5%, resp.) after 360 min. In the case of photocatalytic activity under solar irradiation, the samples annealed at 1000°C, 1150°C, and 1200°C produced total degradation of MB after only 300 min. Hence, the results obtained with solar photocatalysis suggest that our powders could be useful for water cleaning in water treatment plants.

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