Up a level |
Suyver, J. Freek; Grimm, Judith; van Veen, Marieke; Biner, Daniel; Krämer, Karl; Güdel, Hans-Ulrich (2006). Upconversion spectroscopy and properties of NaYF4 doped with Er3+, Tm3+ and/or Yb3+. Journal of luminescence, 117(1), pp. 1-12. Amsterdam: North-Holland 10.1016/j.jlumin.2005.03.011