We have measured the absorption, the visible emission spectra and the lifetimes of Ca3Sc2Ge3O12 single crystals activated with Ce3+ or Pr3+. The crystals were grown by the ‘flux growth’ method. The optical spectra of the Ce3+-doped crystal consist of broadbands as a consequence of the strong electron–phonon coupling in the 2D(5d1) excited level, the emission band being located in the blue-green region with maximum at about 480 nm. The spectroscopic properties of CaSGG:Pr are affected by inhomogeneous broadening arising from the presence of non-equivalent optical centres. The spontaneous transition probabilities, the branching ratios and the radiative lifetimes have been calculated in the framework of the Judd–Ofelt Theory and compared with the experimental results for the 3P0 and 1D2 levels. The emission cross-sections of the transitions originating from the 3P0 level were calculated and compared with those reported for other Pr3+-doped crystals of technological interest.
|Autori interni:||TONCELLI, ALESSANDRA|
|Autori:||S. PINELLI; S. BIGOTTA; TONCELLI A; M. TONELLI; E. CAVALLI; E. BOVERO|
|Titolo:||Study of the visible spectra of Ca3Sc2Ge3O12 garnet crystals doped Ce3+ and Pr3+|
|Anno del prodotto:||2004|
|Digital Object Identifier (DOI):||10.1016/S0925-3467(03)00231-3|
|Appare nelle tipologie:||1.1 Articolo in rivista|