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The role of Ln³⁺ (Ln = Eu, Yb) in persistent red luminescence in MgGeO₃:Mn²⁺

Katayama, Y. (author), Kayumi, T. (author), Ueda, J. (author), Dorenbos, P. (author), Viana, B (author), Tanabe, S (author)

In this paper, Mn2+ and Ln3+ (Ln = Eu, Yb) co-doped MgGeO3 phosphors were prepared using a solid state reaction technique, and their optical properties were investigated. Mn2+-doped samples exhibit persistent luminescence in the red region, peaking at 677 nm, because of the 4T1 → 6A1 transition of the Mn2+ ions under ultraviolet (UV) excitation....

journal article 2017

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The Bi³⁺ 6s and 6p electron binding energies in relation to the chemical environment of inorganic compounds

Awater, R.H.P. (author), Dorenbos, P. (author)

This paper provides an overview and interpretation of the spectroscopic data of the Bi³⁺ activator ion in 117 different inorganic compounds. The energies of the metal-to-metal charge transfer and the interconfigurational transitions of Bi³⁺ were collected from the archival literature. Using these energies, in combination...

review 2017

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Thermal ionization and thermally activated crossover quenching processes for 5d-4f luminescence in Y3 A l5-x G ax O12: P r3+

Ueda, J. (author), Meijerink, Andries (author), Dorenbos, P. (author), bos, A.J.J. (author), Tanabe, Setsuhisa (author)

We investigated thermally activated ionization and thermally activated crossover as the two possibilities of quenching of 5d luminescence in Pr3+-doped Y3Al5-xGaxO12. Varying the Ga content x gives the control over the relative energy level location of the 5d and 4f2:PJ3 states of Pr3+ and the host conduction band (CB). Temperature-dependent...

journal article 2017

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Charge Carrier Trapping Processes in RE2O2S (RE = La, Gd, Y, and Lu)

Luo, H. (author), bos, A.J.J. (author), Dorenbos, P. (author)

Two different charge carrier trapping processes have been investigated in RE2O2S:Ln3+ (RE = La, Gd, Y, and Lu; Ln = Ce, Pr, and Tb) and RE2O2S:M (M = Ti4+ and Eu3+). Cerium, praseodymium and terbium act as recombination centers and hole trapping centers while host intrinsic defects provide the electron trap. The captured electrons released from...

journal article 2017

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Vacuum referred binding energy of 3d transition metal ions for persistent and photostimulated luminescence phosphors of cerium-doped garnets

Ueda, J. (author), Hashimoto, Atsunori (author), Takemura, Shota (author), Ogasawara, Kazuyoshi (author), Dorenbos, P. (author), Tanabe, Setsuhisa (author)

The Y₃Al_5−xGa_xO₁₂(YAGG):Ce³⁺-Cr³⁺ persistent phosphor is one of the materials in which Cr³⁺ ions act as electron traps. The possibility of electron traps by other transition metal ions (TM³⁺, TM = Sc, Ti, V, Cr, Fe) was investigated and those electron trap...

journal article 2017

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Luminescent properties and energy level structure of CaZnOS:Eu2+

Budde, B (author), Luo, H. (author), Dorenbos, P. (author), van der Kolk, E. (author)

In this work it is shown that CaZnOS:Eu²⁺ has no Eu²⁺ emission even at low temperature. The observed and earlier reported red emission originates from a CaS:Eu²⁺ 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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Thermal quenching of Eu2+ emission in Ca- and Sr-Ga2S4 in relation with VRBE schemes

Dobrowolska, A.P. (author), Dierre, B.F.P.R. (author), Fang, C.M. (author), Hintzen, H.T.J.M. (author), Dorenbos, P. (author)

Structural and optical properties of MGa2S4 (M = Mg, Zn, Ca, Sr, Ba) compounds have been compared, and the vacuum referred binding energy (VRBE) schemes were constructed for the lanthanide ions in the iso-structural compounds CaGa2S4 and SrGa2S4 employing literature data. The VRBE of an electron in the 5d excited state of Eu2+ was found at 0.75...

journal article 2016

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Experiments and theory of ¹³⁸ La radioactive decay

Quarati, F.G.A. (author), Dorenbos, P. (author), Mougeot, X. (author)

journal article 2016

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Gebiedskenmerken als basis voor herontwerp OV-netwerk Den Haag

Dorenbos, G. (author), Nijënstein, S. (author), van Oort, N. (author)

Hoe zou het OV van Den Haag eruit zien als we het opnieuw zouden ontwerpen? Om verbetermogelijkheden in het huidige netwerk op te sporen hebben we een ontwerpmethodiek toegepast met als uitgangspunt een uitgebreide demografische analyse. De methodiek bestond uit vier stappen: In stap 1 zijn demografische gegevens gebruikt voor het genereren van...

conference paper 2016

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Design of broadband high-efficiency superconducting-nanowire single photon detectors

Redaelli, L. (author), Bulgarini, G. (author), Dobrovolskiy, S. (author), Dorenbos, S. N. (author), Zwiller, V.G. (author), Monroy, E (author), Gerard, J.A. (author)

In this paper several designs to maximize the absorption efficiency of superconducting-nanowire single-photon detectors are investigated. Using a simple optical cavity consisting of a gold mirror and a SiO₂ layer, the absorption efficiency can be boosted to over 97%: this result is confirmed experimentally by the realization of an...

journal article 2016

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Electronic structure and site occupancy of lanthanide-doped (Sr, ca)₃(Y, lu)₂Ge₃O₁₂ garnets: A spectroscopic and first-principles study

Luo, H. (author), Ning, Lixin (author), Dong, Yuanyuan (author), bos, A.J.J. (author), Dorenbos, P. (author)

Photoluminescence excitation (PLE) and emission spectra (PL) of undoped (Sr, Ca)₃(Y, Lu)₂Ge₃O₁₂ as well as Eu³⁺- and Ce³⁺-doped samples have been investigated. The PL spectra show that Eu³⁺ enters into both dodecahedral (Ca, Sr) and octahedral (Y, Lu) sites. Ce<sup>3...

journal article 2016

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Vacuum Referred Binding Energy of the Single 3d, 4d, or 5d Electron in Transition Metal and Lanthanide Impurities in Compounds

Rogers, E.G. (author), Dorenbos, P. (author)

The vacuum referred binding energy (VRBE) of the single electron in the lowest energy 3d level of Sc2 +, V4 +, Cr5 +, the lowest 4d level of Y2 +, Zr3 +, Nb4 +, Mo5 + and the lowest 5d level of Ta4 +, and W5 + in various compounds are determined by means of the chemical shift model. They will be compared with the VRBE in the already established...

journal article 2014

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Scintillation properties of Ca co-doped L(Y)SO:Ce between 193 K and 373 K for TOF-PET/MRI

Ter Weele, D.N. (author), Schaart, D.R. (author), Dorenbos, P. (author)

journal article 2014

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Vacuum Referred Binding Energies of the Lanthanides in Transition Metal Oxide Compounds

Dorenbos, P. (author), Rogers, E.G. (author)

The electronic level schemes for divalent and trivalent lanthanide ions in rare earth (La, Gd, Y, Lu, Sc) vanadate, niobate, tantalate, and in alkaline earth (Ba, Sr, Ca, Mg) titanate, molybdate, and tungstate compounds are presented. Use is made of data from luminescence excitation and absorption spectra of lanthanide (mostly Eu3 +, Pr3 +, and...

journal article 2014

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33000 photons per MeV from mixed (Lu0.75Y0.25)3Al5O12:Pr scintillator crystals

Drozdowski, W. (author), Brylew, K. (author), Wojtowicz, A.J. (author), Kisielewski, J. (author), Swirkowicz, M. (author), Lukasiewicz, T. (author), De Haas, J.T.M. (author), Dorenbos, P. (author)

(LuxY1-x)3Al5O12:Pr (x = 0.25, 0.50, 0.75) crystals have been grown by the Czochralski method and their scintillation properties have been examined. Compared to the well-respected LuAG:Pr scintillator, which has so extensively been studied in the recent years, the new mixed LuYAG:Pr crystals display markedly higher light yields, regardless of...

journal article 2014

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The Electronic Structure of Lanthanide Impurities in TiO2, ZnO, SnO2, and Related Compounds

Dorenbos, P. (author)

The vacuum referred binding energy of electrons in the 4fn levels for all divalent and trivalent lanthanide impurity states in TiO2, ZnO, SnO2, and related compounds MTiO3 and MSnO3 (M = Ca2 +, Sr2 +, Ba2 +) and Ca2SnO4 are presented. They are obtained by collecting data from the literature on the spectroscopy of lanthanide ions, and by...

journal article 2013

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Photon pair generation in a silicon micro-ring resonator with reverse bias enhancement

Engin, E. (author), Bonneau, D. (author), Natarajan, C.M. (author), Clark, A.S. (author), Tanner, M.G. (author), Hadfield, R.H. (author), Dorenbos, S.N. (author), Zwiller, V.G. (author), Ohira, K. (author), Suzuki, N. (author), Yoshida, H. (author), Iizuka, N. (author), Ezaki, M. (author), O’Brien, J.L. (author), Thompson, M.G. (author)

Photon sources are fundamental components for any quantum photonic technology. The ability to generate high count-rate and low-noise correlated photon pairs via spontaneous parametric down-conversion using bulk crystals has been the cornerstone of modern quantum optics. However, future practical quantum technologies will require a scalable...

journal article 2013

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Energy resolution and related charge carrier mobility in LaBr3:Ce scintillators

Khodyuk, I.V. (author), Quarati, F.G.A. (author), Alekhin, M.S. (author), Dorenbos, P. (author)

The scintillation response of LaBr3:Ce scintillation crystals was studied as function of temperature and Ce concentration with synchrotron X-rays between 9?keV and 100?keV. The results were analyzed using the theory of carrier transport in wide band gap semiconductors to gain new insights into charge carrier generation, diffusion, and capture...

journal article 2013

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Improvement of LaBr3:5%Ce scintillation properties by Li1, Na1, Mg21, Ca21, Sr21, and Ba21 co-doping

Alekhin, M.S. (author), Biner, D.A. (author), Krämer, K.W. (author), Dorenbos, P. (author)

This paper reports on the effects of Liþ, Naþ, Mg2þ, Ca2þ, Sr2þ, and Ba2þ co-doping on the scintillation properties of LaBr3:5%Ce3þ. Pulse-height spectra of various gamma and X-ray sources with energies from 8 keV to 1.33 MeV were measured from which the values of light yield and energy resolution were derived. Sr2þ and Ca2þ co-doped crystals...

journal article 2013

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Capacitive readout and gating of superconducting single photon detectors

Azzouz, H. (author), Heeres, R.W. (author), Dorenbos, S.N. (author), Schouten, R.N. (author), Zwiller, V. (author)

We propose and develop a readout scheme for superconducting single-photon detectors based on an integrated circuit, relaxing the need for large bandwidth amplification and resulting in voltage steps proportional to the number of detected photons. We also demonstrate time gating, to filter scattered light in time and reduce dark counts. This...

journal article 2013