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Li, Z. H.; Hudry, D.; Heid, R.; Said, A. H.; Le, M. D.; Popescu, R.; Gerthsen, D.; Merz, M.; Krämer, K. W.; Busko, D.; Howard, I. A.; Richards, B. S.; Weber, F. (2020). Phonon density of states in lanthanide-based nanocrystals. Physical review. B - condensed matter and materials physics, 102(16), p. 165409. American Physical Society 10.1103/PhysRevB.102.165409
Shalav, A.; Richards, B. S.; Trupke, T.; Krämer, Karl; Güdel, Hans-Ulrich (2005). Application of NaYF[sub 4]:Er[sup 3+] up-converting phosphors for enhanced near-infrared silicon solar cell response. Applied physics letters, 86(1), 013505. American Institute of Physics 10.1063/1.1844592
Fischer, S.; Fröhlich, B.; Ivaturi, A.; Herter, B.; Wolf, S.; Krämer, Karl; Richards, B. S.; Goldschmidt, J. C. (2014). Upconverter materials and upconversion solar-cell devices: simulation and characterization with broad solar spectrum illumination. In: Physics, Simulation, and Photonic Engineering of Photovoltaic Devices III. Proceedings of SPIE: Vol. 8981 (89810B). SPIE 10.1117/12.2039407