Abstract
LiYF 4, NaYF 4, KYF 4 and LiLuF 4 doped with Pr 3+ were synthesized by hydrothermal technique. Vacuum ultraviolet excitation and emission properties were investigated at 20 K. A new type of photon cascade emission was observed in LiYF 4:Pr 3+ and LiLuF 4:Pr 3+, i.e. a first-step 4f5d→4f 2 emission followed by a second 4f 2→4f 2 emission. In addition, the internal quantum efficiency of Pr 3+ in NaYF 4 and KYF 4 within visible range was proved to be larger than unity using the branching ratios data corrected by the emission spectra of YF 3:Pr 3+.
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