Abstract:
Upconversion luminescence kinetics of Tm$^{3+}$ doped
Y$_{0.8}$Yb$_{0.2}$F$_{3}$ solid solution crystal was studied for various values
of pulse excitation parameters: pulse duration, wavelength and excitation power.
Analysis of obtained results allowed to make a conclusion about the presence of
transient processes. The transient processes found in upconversion luminescence
kinetics are characterized by duration commensurate with lifetime of the excited
energy levels of the activator ions. Upon completion of these processes a stable
equilibrium state is established between the processes of population and
spontaneous decay of the excited energy levels of Tm$^{3+}$ ions. Conditions
under which the equilibrium state can be maintained have been considered.
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