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Fischer, S.; Fröhlich, B.; Steinkemper, H.; Krämer, Karl; Goldschmidt, J.C. (2014). Absolute upconversion quantum yield of β-NaYF4 doped with Er3+ and external quantum efficiency of upconverter solar cell devices under broad-band excitation considering spectral mismatch corrections. Solar energy materials and solar cells, 122, pp. 197-207. North-Holland 10.1016/j.solmat.2013.12.001
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
