Single Crystal CaS:Eu and SrS:Eu Luminescent Particles Obtained by Solvothermal Synthesis

Haecke, Jo E. Van; Smet, Philippe; Keyser, K. De; Poelman, Dirk

doi:10.1149/1.2756974

Cited by 47 publications

(32 citation statements)

References 25 publications

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“…That is, for the single-cation sulphides SrS:Eu 2 þ and CaS:Eu 2 þ , splitting energies of 1.49 and 1.86 eV, respectively, have been reported 33 . While the green excitation band (400-590 nm) can readily be assigned to the 4f 7 -4f 6 5d 1 :T 2g transition of Eu 2 þ , the ultraviolet-blue band can be assigned to excitation to the 4f 6 5d 1 :E g level 30 . If it is superimposed by matrix absorption as described above, due to the corresponding emission energies, energy transfer from the anion defect levels of Sr 0.40 Ca 0.59 Eu 0.01 S to 4f 6 5d 1 :T 2g in the Eu 2 þ centres can be expected.…”

Section: Photoluminescent Converter Materialmentioning

confidence: 99%

Solar spectral conversion for improving the photosynthetic activity in algae reactors

et al. 2013

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Sustainable biomass production is expected to be one of the major supporting pillars for future energy supply, as well as for renewable material provision. Algal beds represent an exciting resource for biomass/biofuel, fine chemicals and CO 2 storage. Similar to other solar energy harvesting techniques, the efficiency of algal photosynthesis depends on the spectral overlap between solar irradiation and chloroplast absorption. Here we demonstrate that spectral conversion can be employed to significantly improve biomass growth and oxygen production rate in closed-cycle algae reactors. For this purpose, we adapt a photoluminescent phosphor of the type Ca 0.59 Sr 0.40 Eu 0.01 S, which enables efficient conversion of the green part of the incoming spectrum into red light to better match the Q y peak of chlorophyll b. Integration of a Ca 0.59 Sr 0.40 Eu 0.01 S backlight converter into a flat panel algae reactor filled with Haematococcus pluvialis as a model species results in significantly increased photosynthetic activity and algae reproduction rate.

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Section: Photoluminescent Converter Materialmentioning

confidence: 99%

Solar spectral conversion for improving the photosynthetic activity in algae reactors

et al. 2013

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“…The SrS:Eu|SrS:Ce core|shell particles were prepared solvothermally [13] with ethylenediamine (C 2 H 8 N 2 ) (99% Alfa Aesar) as a solvent. This method yields micron-sized single crystalline cuboids, mainly cubes.…”

Section: Methodsmentioning

confidence: 99%

“…In the calculations only orbits whose starting position is close ( ≈ 5 nm) to the position of the path after maximum 1000 bounces are taken into account, otherwise the trajectories tend to meet the corners of the cavity. These corners are typically rounded [13] or the squares are corner-cut [2,12] in any practical situation; in these cases the angle of incidence at the corners does not fulfill the condition n sin θ > 1 and the light will no longer be confined by TIR. After the calculations of the resonant wavelengths, these values are binned per 1 nm in a histogram.…”

Section: Theorymentioning

confidence: 99%

Resonance modes in rare earth doped microcrystals

Korthout¹,

Smet²,

Poelman³

2011

Optical Materials

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Alkaline earth sulfide phosphors doped with Eu 2+ or Ce 3+ are good candidates for wavelength conversion in LEDs for general lighting applications. A very broad emission spectrum can be obtained by preparing SrS:Eu|SrS:Ce core|shell particles. These microcrystals are rectangular cuboids and can also be efficiently excited with electrons in a scanning electron microscope. The broad emission spectrum, ranging from 450 nm to 650 nm, consists of the combined emission of Ce 3+ and Eu 2+ centers. Using cathodoluminescence (CL) in a scanning electron microscope, evaluation of the emission characteristics of individual cuboids was possible. Sharp peaks in the CL-spectra of individual particles could be observed and described as being resonance modes. The spectral positions and the line widths of resonance modes in these core|shell microcrystals are predicted by an extension of the plane wave model, taking into account the dispersion of the refractive index and the existence of open orbits.

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“…Electron beam evaporation often leads to sulfur deficient thin films [11] and RF sputtering sulfides in a reproducible way is far from evident. can be found elsewhere [12,13].…”

Section: Introductionmentioning

confidence: 99%

Templated growth of textured and luminescent CaS : Eu thin films by a low-temperature solvothermal process

Smet¹,

Poelman²

2009

J. Phys. D: Appl. Phys.

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Abstract. The direct growth of luminescent sulfide thin films onto templated substrates was realised with a solvothermal synthesis method. The as-grown layers of SrS:Eu and CaS:Eu emit a bright and homogeneous photoluminescence, peaking at 610nm and 650nm respectively. x-ray diffraction measurements showed that the layers grown at a temperature of only 200• C are strongly crystalline, with (200) out-ofplane orientation. Using silicon substrates, almost epitaxial growth could be obtained.Electron microscopy was used to study the growth, morphology and texture of the thin films. The main advantages of this innovative approach for the production of sulfide layers are the low-temperature process and scalability.

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Single Crystal CaS:Eu and SrS:Eu Luminescent Particles Obtained by Solvothermal Synthesis

Cited by 47 publications

References 25 publications

Solar spectral conversion for improving the photosynthetic activity in algae reactors

Solar spectral conversion for improving the photosynthetic activity in algae reactors

Resonance modes in rare earth doped microcrystals

Templated growth of textured and luminescent CaS : Eu thin films by a low-temperature solvothermal process

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