Abstract
We investigated the up-conversion mechanisms leading to RGB emission in a Pr 3+ : Bi 4Ge 3O 12(BGO) crystal excited to the 1 D 2 level. Sequential two-photon excitation process (STEP) was found to be the dominant mechanism to populate the fluorescing 3 P 0 and 3 P 1 levels, also with a minor contribution of energy transfer up-conversion (ETU). Furthermore, the initial state of the excited state absorption (ESA) in the STEP was proven to be the 3 H 6 level with a dual-wavelengths excitation experiment. This excitation scheme provides significant enhancement of fluorescence intensity compared with the single-wavelength excitation.
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