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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
