Searched for: author%3A%22van+der+Kolk%2C+E.%22
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Derksen, M. (author), Bizinoto Ferreira Bosco, G. (author), Muller, Timo (author), van der Kolk, E. (author)
The characterization of a wide range of luminescent thin films can be a long and tedious endeavor. With reactive combinatorial sputtering of multiple metal targets, it possible to fabricate thin films with a gradient in composition simply by not rotating the substrate. In this work, combinatorically sputtered thin films of Cr<sup>3+</sup> and...
journal article 2024
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Plokker, M.P. (author), Vlaar, S.A. (author), Bakx, A.H.J. (author), van der Kolk, E. (author), Dorenbos, P. (author), Hintzen, H.T.J.M. (author)
The luminescence properties of Tm2+-doped BaCl2 with an orthorhombic structure have been studied as a function of temperature and compared to other Tm2+-doped chlorides. In addition to the 2F5/2 → 2F7/2 (4f13 → 4f13) line emission, two 4f125d1 → 4f13 band emissions are observed at 20 K that can be ascribed to the spin-allowed (3H6,5d1)S=1/2 →...
journal article 2023
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Bizinoto Ferreira Bosco, G. (author), van den Biesen, J. K. (author), Boers, C. D. (author), Simone, G. (author), Kao, C.C. (author), Tichelaar, F.D. (author), Boshuizen, B. (author), van der Kolk, E. (author)
Silicon-aluminum-oxigen (SiAlO) coatings doped with Sm<sup>2+</sup> and prepared by reactive magnetron co-sputtering of Si, Al, and Sm targets, are attractive for luminescence solar concentrator applications but suffer from the low absorption between 300 and 600 nm. This article reports that the main cause of low absorption is a high...
journal article 2022
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Plokker, M.P. (author), van der Knijff, I.C. (author), de Wit, A.V. (author), Voet, B. (author), Woudstra, T. (author), Khanin, V. (author), Dorenbos, P. (author), van der Kolk, E. (author)
The prospect of using Tm<sup>2+</sup>-doped halides for luminescence solar concentrators (LSCs) requires a thorough understanding of the temperature dependent Tm<sup>2+</sup> excited states dynamics that determines the internal quantum efficiency (QE) and thereby the efficiency of the LSC. In this study we investigated the dynamics in CaX<sub...
journal article 2021
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Plokker, M.P. (author), Biner, D. A. (author), Dusoswa, N. (author), Dorenbos, P. (author), Krämer, K. W. (author), van der Kolk, E. (author)
In this study, we systematically vary the Cl/Br and Br/I ratios in CsCaX<sub>3</sub>:Tm<sup>2+</sup> (X = Cl, Br, I) and hereby gradually shift the positions of the Tm<sup>2+</sup> 4f<sup>12</sup>5d<sup>1</sup>-levels as relative to the two 4f<sup>13</sup> levels. At low temperatures up to five distinct Tm<sup>2+</sup> 4f<sup>12</sup>5d<sup>1...
journal article 2021
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Merkx, E.P.J. (author), Plokker, M.P. (author), van der Kolk, E. (author)
The parameters governing the performance of a luminescent solar concentrator (LSC) are determined for sputtered thin-films of NaI:Tm<sup>2+</sup>, CaBr<sub>2</sub>:Tm<sup>2+</sup>, and CaI<sub>2</sub>:Tm<sup>2+</sup>. These parameters are determined by using six gradient thin film material libraries, combinatorially sputtered from metallic...
journal article 2021
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Meeuwissen, A.A. (author), Bizinoto Ferreira Bosco, G. (author), van der Kolk, E. (author)
This paper reports the fabrication and characterization of several thulium oxide and nitride thin films grown by reactive magnetron direct-current sputtering. Hysteresis curves of the Tm emission spectra of the sputtering plasma versus the flow of N<sub>2</sub> or O<sub>2</sub> around the Tm-metal target were monitored. Emission spectra of...
journal article 2021
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Bizinoto Ferreira Bosco, G. (author), van der Kolk, E. (author)
The valence stability parameter (E<sub>Ff</sub>), defined as the difference between the charge transfer energy to the host intrinsic Fermi energy, was used as criterion to analyze the capability of different host materials within the SiAlON class to stabilize divalent thulium. Available data on charge transfer energies and optical bandgap...
conference paper 2020
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Plokker, M.P. (author), Hoogsteen, W. (author), Abellon, R.D. (author), Krämer, K. W. (author), van der Kolk, E. (author)
The concentration dependent luminescence of the SrI<sub>2</sub>-TmI<sub>2</sub> system was investigated. For Tm<sup>2+</sup> concentrations up to 5 mol %, the quantum efficiency (QE) of the <sup>2</sup>F<sub>5/2</sub>→<sup>2</sup>F<sub>7/2</sub> emission exhibits a constant value above 50%. The QE drops for higher Tm<sup>2+</sup>...
journal article 2020
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Merkx, E.P.J. (author), van Overbeek, S. (author), van der Kolk, E. (author)
SiAlON window coatings are applied on an industrial scale to achieve e.g. scratch-resistance and anti-reflection. Doping these SiAlONs with rare-earths adds luminescent functionality, which could be applied in photovoltaics. By using a combinatorial reactive sputtering approach, an amorphous thin film composition library with a Si:Al ratio...
journal article 2019
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Hendriks, M.H.P. (author), van der Kolk, E. (author)
The temperature dependent luminescence properties of Yb2+ doped in NaI, SrI2 and LaI3 powders, prepared by a fast synthesis method involving the rapid melting and quenching in vacuum are reported. The 4f→5d excitation and emission spectra obtained for SrI2:Yb2+ were found to be in accordance with earlier work validating the synthesis methods. In...
journal article 2019
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Merkx, E.P.J. (author), Lensvelt, T.G. (author), van der Kolk, E. (author)
Building-integrated photovoltaics are drawing much attention to make the built environment self-sufficient in terms of electricity. Luminescent solar concentrators (LSCs) can provide this electricity generation when used as photovoltaic windows. Paramount to an efficient LSC are non-overlapping absorption and emission spectra, to avoid self...
journal article 2019
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Plokker, M.P. (author), van der Kolk, E. (author)
In recent years, Thulium in its 2 + oxidation state has been identified as candidate dopant in halide hosts for luminescent solar concentrators. Yet, some of its luminescent properties with regard to these applications remain unexplored. In this study we report on the temperature dependent photo-luminescent behaviour of NaCl:Tm<sup>2+</sup>,...
journal article 2019
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Merkx, E.P.J. (author), van der Kolk, E. (author)
Understanding the behavior of combinatorially developed luminescent materials requires detailed characterization methods that have been lacking thus far. We developed a device for directly surveying the luminescent properties of thin-film libraries created through combinatorial gradient sputter deposition. Step-scan recorded excitation-,...
journal article 2018
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Merkx, E.P.J. (author), ten Kate, O.M. (author), van der Kolk, E. (author)
The phenomenon of self-absorption is by far the largest influential factor in the eficiency of luminescent solar concentrators (LSCs), but also the most challenging one to capture computationally. In this work we present a model using a multiple-generation light transport (MGLT) approach to quantify light transport through single-layer...
journal article 2017
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Budde, B (author), Luo, H. (author), Dorenbos, P. (author), van der Kolk, E. (author)
In this work it is shown that CaZnOS:Eu<sup>2+</sup> has no Eu<sup>2+</sup> emission even at low temperature. The observed and earlier reported red emission originates from a CaS:Eu<sup>2+</sup> impurity phase. By means of washing the as-prepared samples with diluted nitride acid, we were able to remove the CaS impurity phase and study the...
journal article 2017
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Van der Kolk, E. (author)
A solar radiation conversion device is described that comprises a luminescent Tm 2+ inorganic material for converting solar radiation of at least part of the UV and/or visible and/or infra red solar spectrum into infrared solar radiation, preferably said infrared solar radiation having a wavelength of around 1138 nm; and, a photovoltaic device...
patent 2015
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Ten Kate, O.M. (author), Hooning, K.M. (author), Van der Kolk, E. (author)
Analytical equations quantifying self-absorption losses in circular luminescent solar concentrators (LSCs) are presented that can easily be solved numerically by commercial math software packages. With the quantum efficiency, the absorption and emission spectra of a luminescent material, the LSC dimensions, and the refractive index as the only...
journal article 2014
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Ten Kate, O.M. (author), De Jong, M. (author), Hintzen, H.T. (author), Van der Kolk, E. (author)
Solar cells of which the efficiency is not limited by the Shockley-Queisser limit can be obtained by integrating a luminescent spectral conversion layer into the cell structure. We have calculated the maximum efficiency of state-of-the-art c-Si, pc-Si, a-Si, CdTe, GaAs, CIS, CIGS, CGS, GaSb, and Ge solar cells with and without an integrated...
journal article 2013
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Van der Kolk, E. (author), Lammerse, D.B.B. (author)
patent 2012
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