Highly efficient near-infrared to visible up-conversion process in NaYF4:Er3+,Yb3+
Keywords: طیفسنجی; 42.65.Ky; 42.70.Nq; 78.20.âe; 78.55.âm; 78.55.Fv; Up-conversion; Spectroscopy; NaYF4:Er; Efficiency;