Figure 5.
Plots (log–log) of the emission intensity versus pump power density for different samples at (a) 1I2→3F4 (Tm3+), (b) 1D2→3F4 (Tm3+), (c) 1G4→3H6 (Tm3+), and (d) 3H4→3H6 (Tm3+).
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