Abstract
Using the decay curve analysis frequency upconversion under continuous wave NIR laser radiation (∼890 nm) following the non-resonant excitation at higher energies than 1G 4 level has been reported. The decay curve of the antistokes emission ( 3P 0 → 3H 4) shows similar behavior as that of the stokes emission ( 3P 0 → 3H 4) and does not show any rise time attributing to the excited state antistokes absorption assisted by phonon emission. The covalency, bonding parameters and nephalauxetic effect for the present system has also been determined.
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