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Emission spectrum of upon excitation into the level at 489.7 nm .
Infrared emission spectrum of (a): ; , (b): ; and (c): ; . The spectra are recorded for excitation into the level of at 490 nm.
Excitation spectrum of for emission at 999 nm, . The inset shows the energy level diagrams of and and the downconversion process is depicted. Broken lines indicate energy transfer while the drawn lines depict radiative decay.
Excitation spectrum of (a): and (b): ; 15%Yb for emission at 1548 nm, .
Decay curves of emission at 491.0 nm after excitation at 489.7 nm for (a): and (b): ; 15%Yb for . (a) has a decay time of , whereas (b) has a decay time of .
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