@article{PuesLaubeFischeretal.2021,
  author    = {Pues, Patrick and Laube, Michael and Fischer, Stefan and Schr{\"o}der, Franziska and Schwung, Sebastian and Rytz, Daniel and Fiehler, Torben and Wittrock, Ulrich and J{\"u}stel, Thomas},
  title     = {Luminescence and up-conversion of single crystalline Lu3Al5O12:Pr3+},
  series = {Journal of Luminescence},
  volume    = {234},
  journal   = {Journal of Luminescence},
  doi       = {10.1016/j.jlumin.2021.117987},
  pages     = {117987 -- 117995},
  year      = {2021},
  abstract  = {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.},
  language  = {en}
}
@article{LoikoRytzSchwungetal.2021,
  author    = {Loiko, Pavel and Rytz, Daniel and Schwung, Sebastian and Pues, Patrick and J{\"u}stel, Thomas and Doualan, Jean-Louis and Camy, Patrice},
  title     = {Watt-level europium laser at 703 nm},
  series = {Optics letters},
  volume    = {46},
  journal   = {Optics letters},
  doi       = {10.1364/OL.428706},
  pages     = {2702 -- 2705},
  year      = {2021},
  abstract  = {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.},
  language  = {en}
}
@article{KeilPaulsenRosneretal.2021,
  author    = {Keil, Jan-Niklas and Paulsen, Christian and Rosner, Florian and P{\"o}ttgen, Rainer and J{\"u}stel, Thomas},
  title     = {On the crystal structure and optical spectroscopy of rare earth comprising quaternary tungstates Li3Ba2RE3(WO4)8 (RE = La-Nd, Sm-Ho)},
  series = {Dalton Transactions},
  volume    = {50},
  journal   = {Dalton Transactions},
  issn      = {1477-9226},
  doi       = {10.1039/D1DT00795E},
  pages     = {9225 -- 9235},
  year      = {2021},
  abstract  = {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.},
  language  = {en}
}
@article{PachelStroebeleEnselingetal.2021,
  author    = {Pachel, Florian and Str{\"o}bele, Markus and Enseling, David and J{\"u}stel, Thomas and Meyer, Hans--J{\"u}rgen},
  title     = {Crystal structure, Magnetic and Photoluminescence Properties of GdW 6 Cl 15 , TbW 6 Cl 15 , and EuW 6 Cl 14},
  series = {Zeitschrift f{\"u}r anorganische und allgemeine Chemie},
  volume    = {647},
  journal   = {Zeitschrift f{\"u}r anorganische und allgemeine Chemie},
  issn      = {0044-2313},
  doi       = {10.1002/zaac.202100046},
  pages     = {1392 -- 1396},
  year      = {2021},
  language  = {en}
}
@article{PuesSchwungRytzetal.2021,
  author    = {Pues, Patrick and Schwung, Sebastian and Rytz, Daniel and J{\"u}stel, Thomas},
  title     = {On the use of luminescent single crystals as optical reference materials},
  series = {Journal of Luminescence},
  volume    = {238},
  journal   = {Journal of Luminescence},
  issn      = {0022-2313},
  doi       = {10.1016/j.jlumin.2021.118289},
  pages     = {118289},
  year      = {2021},
  language  = {en}
}
@article{SchroederFischerJuestel2021,
  author    = {Schr{\"o}der, Franziska and Fischer, Stefan and J{\"u}stel, Thomas},
  title     = {X-ray and VUV excitation studies on Pr3+ activated Li2CaSiO4},
  series = {Journal of Luminescence},
  volume    = {235},
  journal   = {Journal of Luminescence},
  issn      = {0022-2313},
  doi       = {10.1016/j.jlumin.2021.118046},
  pages     = {118046},
  year      = {2021},
  language  = {en}
}
@article{SiaiStroebeleEnselingetal.2021,
  author    = {Siai, Amira and Str{\"o}bele, Markus and Enseling, David and J{\"u}stel, Thomas and Meyer, Hans-J{\"u}rgen},
  title     = {Solid-State Synthesis of (Ph 4 P)MI 3 (M=Eu 2+ , Sr 2+ , Sn 2+ ) and Investigation of Photoluminescence Properties of Green Emitting Phosphor},
  series = {European Journal of Inorganic Chemistry},
  volume    = {2021},
  journal   = {European Journal of Inorganic Chemistry},
  issn      = {1434-1948},
  doi       = {10.1002/ejic.202100059},
  pages     = {1846 -- 1851},
  year      = {2021},
  language  = {en}
}
@article{AnselmJuestel2021,
  author    = {Anselm, Viktor and J{\"u}stel, Thomas},
  title     = {On the photoluminescence and energy transfer of SrGa12O19:Cr3+,Nd3+ microscale NIR phosphors},
  series = {Journal of Materials Research and Technology},
  volume    = {11},
  journal   = {Journal of Materials Research and Technology},
  issn      = {2238-7854},
  doi       = {10.1016/j.jmrt.2021.01.047},
  pages     = {785 -- 791},
  year      = {2021},
  language  = {en}
}
@article{KeilPaulsenPoettgenetal.2021,
  author    = {Keil, Jan-Niklas and Paulsen, Christian and P{\"o}ttgen, Rainer and J{\"u}stel, Thomas},
  title     = {On the Crystal Structure and Temperature Dependent Spectroscopy of the UV-C Emitting Phosphor Sr3(BO3)2:Pr3+,Na+},
  series = {Journal of Luminescence},
  volume    = {230},
  journal   = {Journal of Luminescence},
  issn      = {0022-2313},
  doi       = {10.1016/j.jlumin.2020.117765},
  pages     = {117765},
  year      = {2021},
  language  = {en}
}
@article{LaubeJuestel2021,
  author    = {Laube, Michael and J{\"u}stel, Thomas},
  title     = {On the time and temperature dependent photoluminescence of Pr3+ and Gd3+ doped Lu3Al5O12},
  series = {Journal of Luminescence},
  volume    = {236},
  journal   = {Journal of Luminescence},
  issn      = {0022-2313},
  doi       = {10.1016/j.jlumin.2021.118112},
  pages     = {118112},
  year      = {2021},
  language  = {de}
}