Abstract
Steady state and time resolved emission measurements of CaWO4 doped with Pr3+ have been carried out as a function of hydrostatic pressure in the 1–315kbar range. The increase of pressure induces several effects: a progressive red shift of the spectral features and a decrement of the decay times of both 3P0 and 1D2 emitting levels, the decrease of the intensity of the 3P0 emission, that is completely quenched at around 100kbar, and the increase of the 1D2 emission intensity in the 1–120kbar range followed by a fast decrease at higher pressures. In addition, a variation in the structure of the emission manifolds has been observed in the 80–100kbar range as a consequence of the tetragonal to monoclinic phase transition of the host lattice induced by pressure. These effects have been accounted for by means of a model that takes into account the role played by a praseodymium trapped exciton in the excited state dynamics of the investigated material.
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