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Faculty
We report on a watt-level highly efficient europium laser operating at the 5D0→7F4 transition. It is based on the stoichiometric KEu(WO4)2 crystal. Under pumping by a green laser at 532.1 nm, the KEu(WO4)2 laser generated a maximum peak output power of 1.11 W at ∼703nm with a slope efficiency of 43.2% and a linear polarization (????‖????????). A laser threshold as low as 64 mW was achieved. True continuous-wave operation was demonstrated. The polarized emission properties of monoclinic KEu(WO4)2 were determined.
UV-C Luminescence of a Modified Zircon Silicate Framework upon Cathode Ray and VUV Excitation
(2018)
Plasmadisplays, Bildschirmtechnologie für das 21. Jahrhundert, Universität Bochum, 18. Juli 2001
(2001)
Phenanthroline chromophore as efficient antenna for Tb3+ green luminescence: A theoretical study
(2021)
Optical Materials, Options and Opportunities, Philips Research Laboratories Aachen, 04. Februar 2009
(2009)
Optical Characterisation
(2020)
The quaternary tungstates Li3Ba2RE3(WO4)8 (RE = La-Nd, Sm-Ho) were obtained by a ceramic synthesis route and were characterized by powder and single crystal X-ray diffraction. The structures of Li3Ba2Pr3(WO4)8 and Li3Ba2Tb3(WO4)8 were refined from single crystal diffractometer data: RbLiBi2(MoO4)4 type, space group C2/c, a = 528.57(2), b = 1292.39(6), c = 1934.80(10) pm, b = 91.522(4)°, 2151 F2 values, 108 parameters for Li3Ba2Pr3(WO4)8 and a = 520.54(2), b = 1272.03(6), c = 1918.85(10) pm, b = 91.948(4)°, 2020 F2 values, 108 variables for Li3Ba2Tb3(WO4)8. Striking polyhedral building units in these tungstates are WO4 tetrahedra and LiO6 octahedra, while the mixed occupied site and the barium atoms have higher coordination numbers, i.e. RE/Li@O8 and Ba@O10. In addition to the powder quality assessment by means of reflection spectroscopy, the synthesized samples were studied for their suitability as a scintillator material. Therefore, X-ray excited luminescence measurements where performed. Apart from Li3Ba2Ce3(WO4)8 and Li3Ba2Nd3(WO4)8, all compounds show strong emission under X-ray irradiation. Li3Ba2La3(WO4)8 and Li3Ba2Gd3(WO4)8 show blue CT luminescence caused by tungstate units, while the other samples show typical and multiple lines due to well known [Xe]4fn → [Xe]4fn transitions.
Nanoscale Materials and Applications, Rajabhat University, Buriram, Thailand, 11. Februar 2008
(2008)
Modelling and Experimental Investigation of Luminous Coupling in UVLED Driven Optical Fiber Reactors
(2020)
Luminescent Materials, A Challenge for Solid State Chemistry, Universität Köln, 18. Dezember 2001
(2001)
Luminescent Materials towards new Frontiers, University of Townsville, Australia, 27. Juni 2001
(2001)
Luminescent Materials for the Conversion of Vacuum UV Radiation, Universität Tübingen, 11. Mai 2009
(2009)
Luminescent Materials for Solid State Light Sources, Universität Tübingen, 15. September 2005
(2005)
Luminescent Materials for Gas Discharge and Solid-State Light Sources, WWU Münster, 20. April 2006
(2006)
This work deals with the spectroscopic properties of praseodymium doped single crystalline lutetium aluminum garnet (LuAG:Pr3+). A special focus was set on temperature- and time-dependent spectroscopy. Beyond the well-known down-conversion luminescence of LuAG:Pr3+, also UV-A/B up-conversion luminescence under excitation with a 488 nm laser was thoroughly investigated. Furthermore, the results of the spectroscopic investigations on the single crystalline material were supplemented and compared with measurements on a microscale powder sample.
In addition, to the spectroscopic investigations, mechanistic considerations are presented to obtain a closer look at the up-conversion process in LuAG:Pr3+. We promote the thesis of a temperature-dependent energy transfer up-conversion mechanism.
Leuchtstoffe für Entladungslampen und Plasmabildschirme, MPI für Kohlenforschung, 9. November 1999
(1999)