TY - JOUR A1 - Pues, Patrick A1 - Laube, Michael A1 - Fischer, Stefan A1 - Schröder, Franziska A1 - Schwung, Sebastian A1 - Rytz, Daniel A1 - Fiehler, Torben A1 - Wittrock, Ulrich A1 - Jüstel, Thomas T1 - Luminescence and up-conversion of single crystalline Lu3Al5O12:Pr3+ JF - Journal of Luminescence N2 - 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. KW - Pr3+ luminescence KW - Single crystal KW - Photoluminescence KW - Up-conversion KW - Temperature-dependent spectroscopy Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.jlumin.2021.117987 VL - 234 SP - 117987 EP - 117995 ER - TY - JOUR A1 - Loiko, Pavel A1 - Rytz, Daniel A1 - Schwung, Sebastian A1 - Pues, Patrick A1 - Jüstel, Thomas A1 - Doualan, Jean-Louis A1 - Camy, Patrice T1 - Watt-level europium laser at 703 nm JF - Optics letters N2 - 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. Y1 - 2021 U6 - http://dx.doi.org/10.1364/OL.428706 VL - 46 SP - 2702 EP - 2705 ER - TY - JOUR A1 - Keil, Jan-Niklas A1 - Paulsen, Christian A1 - Rosner, Florian A1 - Pöttgen, Rainer A1 - Jüstel, Thomas T1 - On the crystal structure and optical spectroscopy of rare earth comprising quaternary tungstates Li3Ba2RE3(WO4)8 (RE = La-Nd, Sm-Ho) JF - Dalton Transactions N2 - 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. Y1 - 2021 U6 - http://dx.doi.org/10.1039/D1DT00795E SN - 1477-9226 VL - 50 SP - 9225 EP - 9235 ER - TY - JOUR A1 - Pachel, Florian A1 - Ströbele, Markus A1 - Enseling, David A1 - Jüstel, Thomas A1 - Meyer, Hans--Jürgen T1 - Crystal structure, Magnetic and Photoluminescence Properties of GdW 6 Cl 15 , TbW 6 Cl 15 , and EuW 6 Cl 14 JF - Zeitschrift für anorganische und allgemeine Chemie Y1 - 2021 U6 - http://dx.doi.org/10.1002/zaac.202100046 SN - 0044-2313 VL - 647 SP - 1392 EP - 1396 ER - TY - JOUR A1 - Pues, Patrick A1 - Schwung, Sebastian A1 - Rytz, Daniel A1 - Jüstel, Thomas T1 - On the use of luminescent single crystals as optical reference materials JF - Journal of Luminescence Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.jlumin.2021.118289 SN - 0022-2313 VL - 238 SP - 118289 ER - TY - JOUR A1 - Schröder, Franziska A1 - Fischer, Stefan A1 - Jüstel, Thomas T1 - X-ray and VUV excitation studies on Pr3+ activated Li2CaSiO4 JF - Journal of Luminescence Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.jlumin.2021.118046 SN - 0022-2313 VL - 235 SP - 118046 ER - TY - JOUR A1 - Siai, Amira A1 - Ströbele, Markus A1 - Enseling, David A1 - Jüstel, Thomas A1 - Meyer, Hans-Jürgen T1 - 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 JF - European Journal of Inorganic Chemistry Y1 - 2021 U6 - http://dx.doi.org/10.1002/ejic.202100059 SN - 1434-1948 VL - 2021 SP - 1846 EP - 1851 ER - TY - JOUR A1 - Anselm, Viktor A1 - Jüstel, Thomas T1 - On the photoluminescence and energy transfer of SrGa12O19:Cr3+,Nd3+ microscale NIR phosphors JF - Journal of Materials Research and Technology Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.jmrt.2021.01.047 SN - 2238-7854 VL - 11 SP - 785 EP - 791 ER - TY - JOUR A1 - Keil, Jan-Niklas A1 - Paulsen, Christian A1 - Pöttgen, Rainer A1 - Jüstel, Thomas T1 - On the Crystal Structure and Temperature Dependent Spectroscopy of the UV-C Emitting Phosphor Sr3(BO3)2:Pr3+,Na+ JF - Journal of Luminescence Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.jlumin.2020.117765 SN - 0022-2313 VL - 230 SP - 117765 ER - TY - JOUR A1 - Laube, Michael A1 - Jüstel, Thomas T1 - On the time and temperature dependent photoluminescence of Pr3+ and Gd3+ doped Lu3Al5O12 JF - Journal of Luminescence Y1 - 2021 U6 - http://dx.doi.org/10.1016/j.jlumin.2021.118112 SN - 0022-2313 VL - 236 SP - 118112 ER -