Former Members of the Güdel Group

Dr. Karl Krämer;
scientist

Contact Karl Krämer, kk.JPG (32 kByte)
Dr. Karl Krämer
Departement für Chemie und Biochenie
Universität Bern
Freiestrasse 3
CH - 3000 Bern 9
Switzerland
Room N532
Phone +41 (0)31 631 42 48
Fax +41 (0)31 631 43 99
e-Mail karl.kraemer@iac.unibe.ch
Web http://kraemer.dcb.unibe.ch

Education

 

Research field

Synthesis and crystal growth of rare earth halides
IR to VIS upconversion
Rare earth phosphors and scintillators
Magnetic structures

Publications

L. Keller, A. Furrer, P. Fischer, P. Allenspach, K. Krämer, H. U. Güdel A. Dönni, and T. Suzuki
Magnetic phase transitions and crystal-field splitting in K2UX5 (X=Cl, Br, I)
Phys.Rev.B. 51, 2881-2890 (1995)      Full Text (PDF)      DOI-Link

Toni Riedener, Karl Krämer and Hans U. Güdel
Upconversion Luminescence in Er3+-Doped RbGd2Cl7 and RbGd2Br7
Inorg.Chem. 34, 2745-2752 (1995)      Full Text (PDF)      DOI-Link

M. Pollnau, W. Lüthy, H. P. Weber, K. Krämer, H. U. Güdel and R. A. McFarlane
Excited-State Absorption in Er:BaY2F8, and Cs3Er2Br9 and Comparison to Er:LiYF4
Appl.Phys.B. 62, 339-344 (1996)      Full Text (PDF)      DOI-Link

Karl Krämer, Harald Romstedt, Hans-Ulrich Güdel, Peter Fischer, Andrej Murasik and Maria Teresa Fernandez-Diaz
3-D Magnetic Structure of ErF3
Eur.J.Solid State Inorg.Chem. 33, 273-283 (1996)      Full Text (PDF)     

M. Pollnau, W. Lüthy, H. P. Weber, K. Krämer, H. U. Güdel and R. A. McFarlane
Excited-State Dynamics in the Low-Phonon Materials Er3+: BaY2F8 and Cs3Er2Br9
OSA Topical Meeting on "Advanced Solid State Lasers" , S. Payne and C. Pollock (editors), Vol. 1, 474-477 (1996)      Full Text (PDF)     

H. P. Andres, K. Krämer and H.-U. Güdel
Optical absorption and luminescence spectroscopy of U3+ in K2LaX5 (X=Cl,Br,I)
Phys.Rev.B. 54, 3830 (1996)      Full Text (PDF)      DOI-Link

J. van 't Spijker, P. Dorenbos, J. de Haas, C. van Eijk, H. U. Güdel and K. Krämer
Scintillation Mechanism of K2LaCl5 doped with Ce
Proceedings Int.Conf.on Inorg.Scintillators, SCINT95 411-414 (1996)      Full Text (PDF)     

Karl W. Krämer, Hans U. Güdel and Robert N. Schwartz
Infrared-to-visible upconversion in LaCl3: 1% Er3+: Energy-level and line-strength calculations
Phys. Rev. B 56, 13830-13840 (1997)      Abstract      Full Text (PDF)      DOI-Link     

P. Dorenbos, J. C. van't Spijker, O. W. V. Frijns, C. W. E. van Eijk, K. Krämer, H. U. Güdel and A. Ellens
Scintillation properties of RbGd2Br7: Ce3+ crystals; fast, efficient, and high density scintillators
Nucl. Instr. Methods Phys. Res. B 132, 728-731 (1997)      Abstract      Full Text (PDF)      DOI-Link     

Karl W. Krämer, Hans U. Güdel and Robert N. Schwartz
NIR to VIS upconversion in LaCl3: 1% Er3+
One- and two-color excitations around 1000 and 800 nm

J. Alloys Comp. 275-277, 191-195 (1998)      Abstract      Full Text (PDF)      DOI-Link     

Ard Ellens, Karl Krämer and Hans U. Güdel
Comparison of the electron-phonon coupling strength of U3+ and Nd3+ in K2LaCl5
J. Lumin. 76-77, 548-550 (1998)      Abstract      Full Text (PDF)      DOI-Link     

N. Cavadini, W. Henggeler, A. Furrer, H.-U. Güdel, K. Krämer and H. Mutka
Magnetic excitations in the quantum spin system KCuCl3
Eur. Phys. J. B 7, 519-522 (1999)      Abstract      Full Text (PDF)      DOI-Link     

K. W. Krämer, H. U. Güdel, B. Roessli, P. Fischer, A. Dönni, N. Wada, F. Fauth, M. T. Fernandez-Diaz and T. Hauss
Noncollinear two- and three-dimensional magnetic ordering in the honeycomb lattices of ErX3 (X = Cl,Br,I)
Phys. Rev. B 60, 3724-3727 (1999)      Abstract      Full Text (PDF)      DOI-Link     

W. Henggeler, N. Cavadini, A. Furrer, H. U. Güdel, K. Krämer and H. Mutka
Magnetic excitations in the quantum spin system KCuCl3
ILL Annual Report 98, 22-23 (1999)      Abstract      Full Text (PDF)      DOI-Link     

C. M. Combes, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Optical and scintillation properties of pure and Ce3+-doped Cs2LiYCl6 and Li3YCl6:Ce3+ crystals
J. Lumin. 82, 299-305 (1999)      Abstract      Full Text (PDF)      DOI-Link     

O. Guillot-Noel, J. C. van't Spijker, J. T. M. de Haas, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Scintillator Properties of RbGd2Br7:Ce. Advantages and Limitations.
IEEE Trans. Nucl. Sci. 46 (5), (1999)      Abstract      Full Text (PDF)      DOI-Link     

O. Guillot-Noel, J. T. M. de Haas, P. Dorenbos, C. W. E. van Eijk, K. Krämer and H. U. Güdel
Optical and scintillation properties of cerium-doped LaCl3, LuBr3 and LuCl3
J. Lumin. 85, 21-35 (1999)      Abstract      Full Text (PDF)      DOI-Link     

J. C. van 't Spijker, P. Dorenbos, C. W. E. van Eijk, K. Krämer and H. U. Güdel
Scintillation and luminescence properties of Ce3+ doped K2LaCl5
J. Lumin. 85, 1-10 (1999)      Abstract      Full Text (PDF)      DOI-Link     

N. Cavadini, W. Henggeler, A. Furrer, H.-U. Güdel, K. Krämer and H. Mutka
Magnetic excitations and spin gap in KCuCl3
Physica B 540, 276-278 (2000)      Abstract      Full Text (PDF)      DOI-Link     

K. W. Krämer, H. U. Güdel, B. Roessli, P. Fischer, A. Dönni, N. Wada, F. Fauth, M. T. Fernandez-Diaz and T. Hauss
Magnetic ordering in the erbium honeycomb lattices of ErX3 (X=Cl, Br ,I)
Physica B 276-278, 674-675 (2000)      Abstract      Full Text (PDF)      DOI-Link     

D. Schaniel, P. Allenspach, A. Furrer, K. Krämer and H. U. Güdel
Dimer splitting of Er3+ in Cs3Er2X9 (X = Cl, Br): mystery solved
Physica B 276-278, 690-691 (2000)      Abstract      Full Text (PDF)      DOI-Link     

N. Cavadini, G. Heigold, W. Henggeler, A. Furrer, H.-U. Güdel, K. Krämer and H. Mutka
Quantum magnetic interactions in S=1/2 KCuCl3
J. Phys.: Condens. Matter 12, 5463-5472 (2000)      Abstract      Full Text (PDF)      DOI-Link     

D. Andreica, N. Cavadini, H. U. Güdel, F. N. Gygax, K. Krämer, M. Pinkpank and A. Schenck
Muon-induced break up of spin-singlet pairs in the double-chain compound KCuCl3
Physica B 289-290, 176-180 (2000)      Abstract      Full Text (PDF)      DOI-Link     

E. V. D. van Loef, P. Dorenbos and C. W. E. van Eijk, K. Krämer and H. U. Güdel
High-energy-resolution scintillator: Ce3+ activated LaCl3
Appl. Phys. Lett. 77, 1467-1468 (2000)      Abstract      Full Text (PDF)      DOI-Link     

R. Burlot-Loison, M. Pollnau, K. Krämer, P. Egger, J. Hulliger and H. U. Güdel
Laser-relevant spectroscopy and upconversion mechanisms of Er3+ in Ba2YCl7 pumped at 800 nm
J. Opt. Soc. Am. B 17, 2055-2067 (2000)      Abstract      Full Text (PDF)      DOI-Link     

K. W. Krämer, H. U. Güdel, P. Fischer, F. Fauth, M. T. Fernandez-Diaz and T. Hauss
Triangular antiferromagnetic order in the honeycomb layer lattice of ErCl3
Eur. Phys. J. B 18, 39-47 (2000)      Abstract      Full Text (PDF)      DOI-Link     

N. Cavadini, Ch. Rüegg, W. Henggeler, A. Furrer, H.-U. Güdel, K. Krämer and H. Mutka
Temperature renormalization of the magnetic excitations in S=1/2 KCuCl3
Eur. Phys. J. B 18, 565-571 (2000)      Abstract      Full Text (PDF)      DOI-Link     

N. Cavadini, W. Henggeler, A. Furrer, K. Krämer, H. U. Güdel, H. Mutka, A. Wildes and P. Vorderwisch
Triplet Excitations in a Family of S=1/2 Unconventional Antiferromagnets
in "Neutron Scattering in Novel Materials", A. Furrer (ed.)
World Scientific, Singapore, 237-251 (2000)      Abstract      Full Text (PDF)     

P. Dorenbos, C. W. E. van Eijk, H. U. Güdel, K. W. Krämer and E. V. D. van Loef
Ceriumhoudend anorganisch scintillatormateriaal
Dutch patent no. 1014401, 17 february 2000      Abstract      Full Text (PDF)      DOI-Link     

S. Heer, M. Wermuth, K. Krämer and H. U. Güdel
Upconversion excitation of Cr3+ 2E emission in Y3Ga5O12 codoped with Cr3+ and Yb3+
Chem. Phys. Lett. 334, 293-297 (2001)      Abstract      Full Text (PDF)      DOI-Link     

E. V. D. van Loef, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Optical and scintillation properties of pure and Ce3+ doped GdBr3
Optics Communications 189, 297-304 (2001)      Abstract      Full Text (PDF)      DOI-Link     

N. Cavadini, G. Heigold, W. Henggeler, A. Furrer, H.-U. Güdel, K. Krämer and H. Mutka
Magnetic excitations in the quantum spin system TlCuCl3
Phys. Rev. B 63, 172414/1-4 (2001)      Abstract      Full Text (PDF)      DOI-Link     

D. Schaniel, P. Allenspach, A. Furrer, K. Krämer and H. U. Güdel
Dimer Splitting of Er3+ in Cs3Er2Br9
J. Alloys Comp. 323-324, 481-485 (2001)      Abstract      Full Text (PDF)      DOI-Link     

P. Dorenbos, C. W. E. von Eijk, H. U. Güdel, K. W. Krämer and E. V. D. van Loef
Scintillator crystals, method for making same, use thereof
Organisation Mondiale de la Propriété Intellectuelle,
Int. patent number WO 01/60944 A2, 23.08.2001      Abstract      Full Text (PDF)      DOI-Link     

P. Dorenbos, C. W. E. von Eijk, H. U. Güdel, K. W. Krämer and E. V. D. van Loef
Scintillator crystals, method for making same, use thereof
Organisation Mondiale de la Propriété Intellectuelle,
Int. patent number WO 01/60945 A2, 23.08.2001      Abstract      Full Text (PDF)      DOI-Link     

Karl W. Krämer, Ralph Schenker, Jürg Hauser, Høgni Weihe, Hans U. Güdel and Hans-Beat Bürgi
Crystal Structures of (Et4N)3M2F9 (M = V, Cr, Fe) determined by X-Ray Single-Crystal and Powder Diffraction: A New Structure Type for A3M2X9 Compounds
Z. Anorg. Allg. Chem. 627, 2511-2516 (2001)      Abstract      Full Text (PDF)      DOI-Link     

E. V. D. van Loef, P. Dorenbos, C. W. E. van Eijk, K. Krämer and H. U. Güdel
Scintillation Properties of LaCl3:Ce3+ Crystals: 
Fast, Efficient and High-Energy Resolution Scintillators

IEEE Trans. Nucl. Sci. 48, 341-345 (2001)      Abstract      Full Text (PDF)      DOI-Link     

E. V. D. van Loef, P. Dorenbos, C. W. E. van Eijk, K. Krämer and H. U. Güdel
High-energy-resolution scintillator: Ce3+ activated LaBr3
Appl. Phys. Lett. 79, 1573-1575 (2001)      Abstract      Full Text (PDF)      DOI-Link     

C. W. E. van Eijk, P. Dorenbos, E. V. D. van Loef, K. Krämer and H. U. Güdel
Energy resolution of some new inorganic-scintillator gamma-ray detectors
Rad. Meas. 33, 521-525 (2001)      Abstract      Full Text (PDF)      DOI-Link     

N. Cavadini, W. Henggeler, A. Furrer, K. Krämer, H. U. Güdel, H. Mutka, A. Wildes and P. Vorderwisch
Quantum magnetic phase transition: a top-down approach
ILL Annual Report 2000, 12-13 (2001)      Abstract      Full Text (PDF)      DOI-Link     

N. Cavadini, A. Furrer, H.-U. Güdel, K. Krämer, H. Mutka and A. Wildes
Polarization Study of the Singlet-Triplet Modes in a Quantum Spin System
Proc. ILL millennium symposium, 145-146 (2001)      Abstract      Full Text (PDF)      DOI-Link     

Oliver S. Wenger, Claudia Wickleder, Karl W. Krämer and Hans U. Güdel
Upconversion in a divalent rare earth ion: optical absorption and luminescence spectroscopy of Tm2+ doped SrCl2
J. Lumin. 94-95, 101-105 (2001)      Abstract      Full Text (PDF)      DOI-Link     

S. Heer, M. Wermuth, K. Krämer, D. Ehrentraut and H. U. Güdel
Up-conversion excitation of sharp Cr3+ 2E emission in YGG and YAG codoped with Cr3+ and Yb3+
J. Lumin. 94-95, 337-341 (2001)      Abstract      Full Text (PDF)      DOI-Link     

N. Cavadini, Ch. Rüegg, A. Furrer, H. U. Güdel, K. Krämer, H. Mutka and P. Vorderwisch
Triplet excitations in low-Hc spin gap systems KCuCl3 and TlCuCl3: An inelastic neutron scattering study
Phys. Rev. B 65, 132415/1-4 (2002)      Abstract      Full Text (PDF)      DOI-Link     

S. Heer, M. Wermuth, K. Krämer and H. U. Güdel
Sharp 2E upconversion luminescence of Cr3+ in Y3Ga5O12 codoped with Cr3+ and Yb3+
Phys. Rev. B 65, 125112/1-10 (2002)      Abstract      Full Text (PDF)      DOI-Link     

C. P. Allier, E. V. D. van Loef, P. Dorenbos, R. W. Hollander, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Readout of a LaCl3(Ce3+) scintillation crystal with a large area avalanche photodiode
Nucl. Instr. and Methods Phys. Res. A 485, 547-550 (2002)      Abstract      Full Text (PDF)      DOI-Link     

E. V. D. van Loef, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Scintillation properties of LaBr3:Ce3+ crystals: fast, efficient and high-energy-resolution scintillators
Nucl. Instr. and Methods Phys. Res. A 486, 254-258 (2002)      Abstract      Full Text (PDF)      DOI-Link     

E. V. D. van Loef, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and Hans U. Güdel
Scintillation and spectroscopy of the pure and Ce3+-doped elpasolites: Cs2LiYX6 (X = Cl, Br)
J. Phys.: Condens. Matter 14, 8481-8496 (2002)      Abstract      Full Text (PDF)      DOI-Link     

N. Cavadini, Ch. Rüegg, A. Furrer, H. U. Güdel, K. Krämer, H. Mutka, A. Wildes, K. Habicht and P. Vorderwisch
Triplet modes in a quantum spin liquid across the critical field
Int. J. Mod. Phys. B 16, 3302-3305 (2002)      Abstract      Full Text (PDF)      DOI-Link     

K. W. Krämer, H. U. Güdel, P. Fischer and L. Keller
Magnetic order in CeI2
Appl. Phys. A 74, S595-S597 (2002)      Abstract      Full Text (PDF)      DOI-Link     

Ch. Rüegg, N. Cavadini, A. Furrer, K. Krämer, H. U. Güdel, P. Vorderwisch and H. Mutka
Spin dynamics in the high-field phase of quantum-critical S = 1/2 TlCuCl3
Appl. Phys. A 74, S840-S842 (2002)      Abstract      Full Text (PDF)      DOI-Link     

U. Rogulis, S. Schweizer, J.-M. Spaeth, E. V. D. van Loef, P. Dorenbos, C. W. E. van Eijk, K. Krämer and H. U. Güdel
Magnetic Resonance Investigations of LaCl3:Ce3+ Scintillators
Radiation Effects and Defects in Solids 157, 951-955 (2002)      Abstract      Full Text (PDF)      DOI-Link     

G. Mackay Salley, Oliver S. Wenger, Karl W. Krämer and Hans U. Güdel
Inorganic solid state optical materials: Major recent advances
Current Opinion in Solid State and Materials Science 6, 487-493 (2002)      Abstract      Full Text (PDF)      DOI-Link     

Pascal Gerner, Karl Krämer and Hans U. Güdel
Broad-band Cr5+-sensitized Er3+ luminescence in YVO4
J. Lumin. 102-103, 112-118 (2003)      Abstract      Full Text (PDF)      DOI-Link     

Ch. Rüegg, N. Cavadini, A. Furrer, H.-U. Güdel, K. Krämer, H. Mutka, A. Wildes, K. Habicht and P. Vorderwisch
Bose–Einstein condensation of the triplet states in the magnetic insulator TlCuCl3
Nature 423, 62-65 (2003)      Abstract      Full Text (PDF)      DOI-Link     

E. V. D. van Loef, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Properties and mechanism of scintillation in LuCl3:Ce3+ and LuBr3:Ce3+ crystals
Nucl. Instr. and Methods Phys. Res. A 496, 138-145 (2003)      Abstract      Full Text (PDF)      DOI-Link     

N. Cavadini, D. Andreica, F. N. Gygax, A. Schenck, K. Krämer, H.-U. Güdel, H. Mutka and A. Wildes
Local spin susceptibility in KCuCl3
Physica B 335, 37-40 (2003)      Abstract      Full Text (PDF)      DOI-Link     

E. V. D. van Loef, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Influence of the anion on the spectroscopy and scintillation mechanism in pure and Ce3+-doped K2LaX5 and LaX3 (X = Cl, Br, I)
Phys. Rev. B 68, 045108/1-9 (2003)      Abstract      Full Text (PDF)      DOI-Link     

P. Dorenbos, E. V. D. van Loef, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Anomalous 10-ns emission in Ce3+-doped Cs3LuCl6
Phys. Rev. B 68, 125108/1-6 (2003)      Abstract      Full Text (PDF)      DOI-Link     

A. Shalav, B. S. Richards, T. Trupke, R. P. Corkish, K. W. Krämer, H. U. Güdel and M. A. Green
The Application of Up-Converting Phosphors for Increased Solar Cell Conversion Efficiencies
Proc. 3rd World Conf. Photovoltaic Energy Conversion, Osaka, May 12-16, 2003, p. 248-250      Abstract      Full Text (PDF)      DOI-Link     

Christine Reinhard, Karl Krämer, Daniel A. Biner and Hans U. Güdel
Cooperative radiative and nonradiative effects in K2NaScF6 codoped with V3+ and Er3+
J. Chem. Phys. 120, 3374-3380 (2004)      Abstract      Full Text (PDF)      DOI-Link     

A. Bessière, P. Dorenbos, C. W. E. van Eijk, L. Pidol, K. W. Krämer and Hans U. Güdel
Spectroscopy and anomalous emission of Ce doped elpasolite Cs2LiYCl6
J. Phys.: Condens. Matter, 16, 1887-1897 (2004)      Abstract      Full Text (PDF)      DOI-Link     

Karl W. Krämer, Daniel Biner, Gabriela Frei, Hans U. Güdel, Markus P. Hehlen and Stefan R. Lüthi
Hexagonal Sodium Yttrium Fluoride Based Green and Blue Emitting Upconversion Phosphors
Chem. Mater. 16, 1244-1251 (2004)      Abstract      Full Text (PDF)      DOI-Link     

Christine Reinhard, Karl Krämer, Daniel A. Biner and Hans-Ulrich Güdel
V3+ sensitized upconversion in Cs2NaScCl6:Pr3+;V3+ and K2NaScF6:Er3+;V3+
J. Alloys Comp. 134, 133-136 (2004)      Abstract      Full Text (PDF)      DOI-Link     

Ch. Rüegg, N. Cavadini, A. Furrer, K. Krämer, H.-U. Güdel, P. Vorderwisch, K. Habicht, H. Mutka and A. Wildes
Spin dynamics in the BEC phase of the S=1/2 quantum spin system TlCuCl3
J. Magn. Magn. Mater. 272-276, 195-196 (2004)      Abstract      Full Text (PDF)      DOI-Link     

Th. Strässle, F. Juranyi, M. Schneider, S. Janssen, A. Furrer, K. W. Krämer and H. U. Güdel
Origin of Higher Order Magnetic Exchange: Evidence for Local Dimer Exchange Striction in CsMn0.28Mg0.72Br3 Probed by Inelastic Neutron Scattering
Phys. Rev. Lett. 92, 257202/1-4 (2004)      Abstract      Full Text (PDF)      DOI-Link     

Ch. Rüegg, M. Oettli, J. Schefer, O. Zaharko, A. Furrer, H. Tanaka, K. W. Krämer, H.-U. Güdel, P. Vorderwisch, K. Habicht, T. Polinski and M. Meissner
Neutron Scattering Study of the Field-Dependent Ground State and the Spin Dynamics in Spin-One-Half NH4CuCl3
Phys. Rev. Lett. 93, 037207/1-4 (2004)      Abstract      Full Text (PDF)      DOI-Link     

A. Bessière, P. Dorenbos, C. W. E. van Eijk, K. Krämer and H. U. Güdel
New thermal neutron scintillators: Cs2LiYCl6 : Ce3+ and Cs2LiYBr6 : Ce3+
IEEE Trans. Nucl. Sci. 51, 2970-2972 (2004)      Abstract      Full Text (PDF)      DOI-Link     

Ch. Rüegg, A. Furrer, D. Sheptyakov, Th. Strässle, K. W. Krämer, H.-U. Güdel and L. Mélési
Pressure-Induced Quantum Phase Transition in the Spin-Liquid TlCuCl3
Phys. Rev. Lett. 93, 257201/1-4 (2004)      Abstract      Full Text (PDF)      DOI-Link     

P. Dorenbos, C. W. E. van Eijk, H. U. Güdel, E. V. D. van Loef and K. W. Krämer
Cristaux scintillateurs du type iodure de terre rare
French patent no. FR 2855830-A1, 10.12.2004      Abstract      Full Text (PDF)      DOI-Link     

A. Bessiere, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer, H. U. Güdel, C. de Mello Donega and A. Meijerink
Luminescence and scintillation properties of the small band gap compound LaI3:Ce3+
Nucl. Instr. Methods Phys. Res. A 537, 22-26 (2005)      Abstract      Full Text (PDF)      DOI-Link     

E. V. D. van Loef, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Scintillation properties of K2LaX5:Ce3+ (X=Cl, Br, I)
Nucl. Instr. Methods Phys. Res. A 537, 232-236 (2005)      Abstract      Full Text (PDF)      DOI-Link     

A. Bessiere, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Luminescence and scintillation properties of Cs2LiYCl6:Ce3+ for g and neutron detection
Nucl. Instr. Methods Phys. Res. A 537, 242-246 (2005)      Abstract      Full Text (PDF)      DOI-Link     

A. Shalav, B. S. Richards, T. Trupke, K. W. Krämer and H. U. Güdel
Application of NaYF4:Er3+ up-converting phosphors for enhanced near-infrared silicon solar cell response
Appl. Phys. Lett. 86, 013505/1-3 (2005)      Abstract      Full Text (PDF)      DOI-Link     

J. F. Suyver, A. Aebischer, D. Biner, P. Gerner, J. Grimm, S. Heer, K. W. Krämer, C. Reinhard and H. U. Güdel
Novel materials doped with trivalent lanthanides and transition metal ions showing near-infrared to visible photon upconversion
Opt. Mater. 27, 1111-1130 (2005)      Abstract      Full Text (PDF)      DOI-Link     

Dominik Schaniel, Theo Woike, Bernard Delley, Colette Boskovic, Daniel Biner, Karl W. Krämer and Hans-Ueli Güdel
Long-lived light-induced metastable states in trans-[Ru(NH3)4(H2O)NO]Cl3·H2O and related compounds
Phys. Chem. Chem. Phys. 7, 1164-1170 (2005)      Abstract      Full Text (PDF)      DOI-Link     

Annina Aebischer, Stephan Heer, Daniel Biner, Karl Krämer, Markus Haase and Hans U. Güdel
Visible light emission upon near-infrared excitation in a transparent solution of nanocrystalline b-NaGdF4: Yb3+, Er3+
Chem. Phys. Lett. 407, 124-128 (2005)      Abstract      Full Text (PDF)      DOI-Link     

J. F. Suyver, J. Grimm, K. W. Krämer and H. U. Güdel
Highly efficient near-infrared to visible up-conversion process in NaYF4:Er3+,Yb3+
J. Lumin. 114, 53-59 (2005)      Abstract      Full Text (PDF)      DOI-Link     

Karl Wilhelm Krämer, Hans-Ulrich Güdel, Aurélie Bessière, Pieter Dorenbos and Carel Wilhelm Eduard van Eijk
High light yield thermal neutron scintillators
European Patent Office,
European patent number EP 1 553 430 A1, 13.07.2005      Abstract      Full Text (PDF)      DOI-Link     

Hans-Benjamin Braun, Jiri Kulda, Bertrand Roessli, Dirk Visser, Karl W. Krämer, Hans-Ulrich Güdel and Peter Böni
Emergence of soliton chirality in a quantum antiferromagnet
Nature Phys. 1, 159-163 (2005)      Abstract      Full Text (PDF)      DOI-Link      Supplementary Data (PDF)     

M. D. Birowosuto, P. Dorenbos, C. W.E. van Eijk, K. W. Krämer and H. U. Güdel
Scintillation Properties of LuI3:Ce3+-High Light Yield Scintillators
IEEE Trans. Nucl. Sci. 52, 1114-1118 (2005)      Abstract      Full Text (PDF)      DOI-Link     

Avi Shalav, Bryce S. Richards, Karl Krämer and H. U. Güdel
Improvements of an up-conversion NaYF4:Er3+ phosphor/silicon solar cell system for an enhanced response in the near-infrared
in "Conference Record of the 31st IEEE Photovoltaic Specialists Conference", Florida, January 2005
Institute of Electrical and Electronics Engineers, ISBN 0-7803-8707-4, 114-117 (2005)      Abstract      Full Text (PDF)      DOI-Link     

Ch. Rüegg, B. Normand, M. Matsumoto, Ch. Niedermayer, A. Furrer, K. W. Krämer, H.-U. Güdel, Ph. Bourges, Y. Sidis and H. Mutka
Quantum Statistics of Interacting Dimer Spin Systems
Phys. Rev. Lett. 95, 267201/1-4 (2005)      Abstract      Full Text (PDF)      DOI-Link     

J. F. Suyver, J. Grimm, M. K. van Veen, D. Biner, K. W. Krämer and H. U. Güdel
Upconversion spectroscopy and properties of NaYF4 doped with Er3+, Tm3+ and/or Yb3+
J. Lumin. 117, 1-12 (2006)      Abstract      Full Text (PDF)      DOI-Link     

P. Dorenbos, E. V. D. van Loef, A. P. Vink, E. van der Kolk, C. W. E. van Eijk, K. W. Krämer, H. U. Güdel, W. M. Higgins and K. S. Shah
Level location and spectroscopy of Ce3+, Pr3+, Er3+, and Eu2+ in LaBr3
J. Lumin. 117, 147-155 (2006)      Abstract      Full Text (PDF)      DOI-Link     

A. Bessière, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer, H. U. Güdel and A. Galtayries
Scintillation and anomalous emission in elpasolite Cs2LiLuCl6:Ce3+
J. Lumin. 117, 187-198 (2006)      Abstract      Full Text (PDF)      DOI-Link     

M. D. Birowosuto, P. Dorenbos, J. T. M. de Haas, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Optical spectroscopy and luminescence quenching of LuI3:Ce3+
J. Lumin. 118, 308-316 (2006)      Abstract      Full Text (PDF)      DOI-Link     

Annina Aebischer, Marc Hostettler, Jürg Hauser, Karl Krämer, Thomas Weber, Hans Ulrich Güdel and Hans-Beat Bürgi
Structural and Spectroscopic Characterization of Active Sites in a Family of Light-Emitting Sodium Lanthanide Tetrafluorides
Angew. Chem. 118, 2869-2873 (2006)      Abstract      Full Text (PDF)      DOI-Link      Supplementary Data (PDF)     
Angew. Chem. Int. Ed. 45, 2802-2806 (2006)      Abstract      Full Text (PDF)      DOI-Link      Supplementary Data (PDF)     

D. Schaniel, Th. Woike, J. Schefer, V. Petrícek, K. W. Krämer, and H. U. Güdel
Neutron diffraction shows a photoinduced isonitrosyl linkage isomer in the metastable state SI of Na2[Fe(CN)5NO]·2D2O
Phys. Rev. B 73, 174108/1-5 (2006)      Abstract      Full Text (PDF)      DOI-Link     

K. W. Krämer, P. Dorenbos, H. U. Güdel and C. W. E. van Eijk
Development and characterization of highly efficient new cerium doped rare earth halide scintillator materials
J. Mater. Chem. 16, 2773-2780 (2006)      Abstract      Full Text (PDF)      DOI-Link      Journal Cover Picture      Journal Cover Picture (PDF)      DOI-Link     

M. D. Birowosuto, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
High-light-output scintillator for photodiode readout: LuI3:Ce3+
J. Appl. Phys. 99, 123520/1-4 (2006)      Abstract      Full Text (PDF)      DOI-Link     

M. D. Birowosuto, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H U Güdel
Scintillation properties and anomalous Ce3+ emission of Cs2NaREBr6:Ce3+ (RE = La,Y,Lu)
J. Phys.: Condens. Matter 18, 6133-6148 (2006)      Abstract      Full Text (PDF)      DOI-Link     

M. D. Birowosuto, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
PrBr3: Ce3+: A New Fast Lanthanide Trihalide Scintillator
IEEE Trans. Nucl. Sci. 53, 3028-3030 (2006)      Abstract      Full Text (PDF)      DOI-Link     

M. D. Birowosuto, P. Dorenbos, J. T. M. de Haas, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Thermal-neutron scintillator: Ce3+ activated Rb2LiYBr6
J. Appl. Phys. 101, 066107/1-3 (2007)      Abstract      Full Text (PDF)      DOI-Link     

M. D. Birowosuto, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Scintillation and luminescence properties of Ce3+ doped ternary cesium rare-earth halides
Phys. Stat. Sol. A 204, 850-860 (2007)      Abstract      Full Text (PDF)      DOI-Link     

H. B. Braun, J. Kulda, B. Roessli, D. Visser, K. W. Krämer, H. U. Güdel and P. Böni
Chiral quantum excitations in the anisotropic antiferromagnet CsCoBr3
J. Magn. Magn. Mater. 310, 1194-1196 (2007)      Abstract      Full Text (PDF)      DOI-Link     

J. Grimm, J. Fleniken, K. W. Krämer, D. Biner, U. Happek and H. U. Güdel
On the determination of photoionization thresholds of Ce3+ doped Cs3LuCl6, Cs2LiLuCl6 and Cs2LiYCl6 by thermoluminescence
J. Lumin. 122-123, 325-328 (2007)      Abstract      Full Text (PDF)      DOI-Link     

D. Schaniel, M. Imlau, T. Weisemoeller, T. Woike, K. W. Krämer and H.-U. Güdel
Photoinduced Nitrosyl Linkage Isomers Uncover a Variety of Unconventional Photorefractive Media
Adv. Mater. 19, 723-726 (2007)      Abstract      Full Text (PDF)      DOI-Link      Journal Cover Picture      Journal Cover Picture (PDF)      DOI-Link     

J. Grimm, O. S. Wenger, K. W. Krämer and H. U. Güdel
4f–4f and 4f–5d excited states and luminescence properties of Tm2+- doped CaF2, CaCl2, SrCl2 and BaCl2
J. Lumin. 126, 590-596 (2007)      Abstract      Full Text (PDF)      DOI-Link     

Dominik Schaniel, Benoit Cormary, Isabelle Malfant, Lydie Valade, Theo Woike, Bernard Delley, Karl W. Krämer and Hans-Ueli Güdel
Photogeneration of two metastable NO linkage isomers with high populations of up to 76% in trans-[RuCl(py)4(NO)][PF6]2·1/2H2O
Phys. Chem. Chem. Phys. 9, 3717-3724 (2007)      Abstract      Full Text (PDF)      DOI-Link     

M. D. Birowosuto, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Thermal quenching of Ce3+ emission in PrX3 (X = Cl, Br) by intervalence charge transfer
J. Phys.: Condens. Matter 19, 256209/1-16 (2007)      Abstract      Full Text (PDF)      DOI-Link     

L. Schnelzer, O. Waldmann, M. Horvatić, S. T. Ochsenbein, S. Krämer, C. Berthier, H. U. Güdel and B. Pilawa
Huge Transverse Magnetic Polarization in the Field-Induced Phase of the Antiferromagnetic Molecular Wheel CsFe8
Phys. Rev. Lett. 99, 087201/1-4 (2007)      Abstract      Full Text (PDF)      DOI-Link     

Dominik Schaniel, Theo Woike, Bernard Delley, Daniel Biner, Karl W. Krämer and Hans-Ueli Güdel
Generation of one light-induced metastable nitrosyl linkage isomer in [Pt(NH3)4Cl(NO)]Cl2 in the red spectral range
Phys. Chem. Chem. Phys. 9, 5149-5157 (2007)      Abstract      Full Text (PDF)      DOI-Link      Supplementary Data (PDF)     

C. W. E. van Eijk, H. U. Güdel , M. D. Birowosuto, P. Dorenbos and K. W. Krämer
High Light Yield Fast Scintillator
World Intellectual Property Organization,
Int. patent number WO 2007/031583 A1, 22.03.2007      Abstract      Full Text (PDF)      DOI-Link     

M. Imlau, V. Dieckmann, T. Weisemoeller, D. Schaniel, T. Woike, K. W. Krämer and H.-U. Güdel
Tuning Ability of Photosensitive ML5NO-Molecules
in "Controlling Light with Light: Photorefractive Effects, Photosensitivity, Fiber Gratings, Photonic Materials and More",
OSA Technical Digest (CD), Optical Society of America, Paper SuC5 (2007)      Abstract      Full Text (PDF)      DOI-Link     

E. van der Kolk, P. Dorenbos, K. Krämer, D. Biner and H. U. Güdel
High-resolution luminescence spectroscopy study of down-conversion routes in NaGdF4:Nd3+ and NaGdF4:Tm3+ using synchrotron radiation
Phys. Rev. B 77, 125110/1-7 (2008)      Abstract      Full Text (PDF)      DOI-Link     

Ch. Rüegg, B. Normand, M. Matsumoto, A. Furrer, D. F. McMorrow, K. W. Krämer, H.-U. Güdel, S. N. Gvasaliya, H. Mutka and M. Boehm
Quantum Magnets under Pressure: Controlling Elementary Excitations in TlCuCl3
Phys. Rev. Lett. 100, 205701/1-4 (2008)      Abstract      Full Text (PDF)      DOI-Link     

M. D. Birowosuto, P. Dorenbos, K. W. Krämer and H. U. Güdel
Ce3+ activated LaBr3–xIx: High-light-yield and fast-response mixed halide scintillators
J. Appl. Phys. 103, 103517/1-6 (2008)      Abstract      Full Text (PDF)      DOI-Link     

M. Danang Birowosuto, Pieter Dorenbos, Johan T. M. de Haas, Carel W. E. van Eijk, Karl W. Krämer and H. U. Güdel
Li-Based Thermal Neutron Scintillator Research; Rb2LiYBr6 : Ce3+ and Other Elpasolites
IEEE Trans. Nucl. Sci. 55, 1152-1155 (2008)      Abstract      Full Text (PDF)      DOI-Link     

M. Danang Birowosuto, Pieter Dorenbos, G. Bizarri, Carel W. E. van Eijk, Karl W. Krämer and H. U. Güdel
Temperature Dependent Scintillation and Luminescence Characteristics of GdI3: Ce3+
IEEE Trans. Nucl. Sci. 55, 1164-1169 (2008)      Abstract      Full Text (PDF)      DOI-Link     

R. Valiente, I. Hernández, F. Rodríguez, F. Aguado, H. U. Güdel and K. Krämer
High-pressure induced absorption line narrowing in Cs3Yb2Cl9
J. Phys. Conf. Ser. 121, 042002/1-5 (2008)      Abstract      Full Text (PDF)      DOI-Link     

B. Thielemann, Ch. Rüegg, H. M. Rønnow, A. M. Läuchli, J.-S. Caux, B. Normand, D. Biner, K. W. Krämer, H.-U. Güdel, J. Stahn, K. Habicht, K. Kiefer, M. Boehm, D. F. McMorrow and J. Mesot
Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder
Phys. Rev. Lett. 102, 107204/1-5 (2009)      Abstract      Full Text (PDF)      DOI-Link     

R. Valiente, F. Rodríguez, J. González, H. U. Güdel, R. Martín-Rodríguez, L. Nataf, M. N. Sanz-Ortiz and K. Krämer
High pressure optical spectroscopy of Ce3+-doped Cs2NaLuCl6
Chem. Phys. Lett. 481, 149-151 (2009)      Abstract      Full Text (PDF)      DOI-Link     

J. J. Eilers, D. Biner, J. T. van Wijngaarden, K. Krämer, H.-U. Güdel and A. Meijerink
Efficient visible to infrared quantum cutting through downconversion with the Er3+–Yb3+ couple in Cs3Y2Br9
Appl. Phys. Lett. 96, 151106/1-3 (2010)      Abstract      Full Text (PDF)      DOI-Link     

A. Furrer, K. W. Krämer, Th. Strässle, D. Biner, J. Hauser and H. U. Güdel
Magnetic and neutron spectroscopic properties of the tetrameric nickel compound [Mo12O28(m2-OH)9(m3-OH)3{Ni(H2O)3}4]·13H2O
Phys. Rev. B 81, 214437/1-10 (2010)      Abstract      Full Text (PDF)      DOI-Link     

new C. Renero-Lecuna, R. Martín-Rodríguez, R. Valiente, J. González, F. Rodríguez, K. W. Krämer and H. U. Güdel
Origin of the High Upconversion Green Luminescence Efficiency in b-NaYF4:2%Er3+,20%Yb3+
Chem. Mater. 23, 3442-3448 (2011)      Abstract      Full Text (PDF)      DOI-Link     

Last modified: 03.04.13 by Gabriela Frei