Advances in Spectroscopy for Lasers and Sensing

Customized physical and structural features of phosphate-based glass-ceramics: role of Ag nanoparticles and Ho3+ impurities

“…Nevertheless, the non-radiative relaxation processes associated to various excited states contributes to the energy loss, thereby limiting its practical applications [9]. To surmount such shortcomings an appropriate selection of the host matrix is necessary where the local electric field inside the host network is responsible for the splitting of the 4f energy levels of Ho 3+ [13,14]. Thus, the selection of the host, sensitization by plasmonic nanostructures and composition optimization are the effective strategies to modify the overall properties, thus achieving the best luminescence features of the Ho 3+ .…”

Ba5Zn4Gd8O21:Tb3+—structural characterization and the Judd-Ofelt parameterization from emission spectra

“…It is a well-known fact that the rationalization of absorption and emission intensities of trivalent lanthanide ions involves some parameterization for electricdipole contribution [1]. In 1962, Judd [2] and Ofelt [3] developed the theoretical basis for such analysis and proposed three parameters, with the help of which we can explain the variation of oscillator strength or the hypersensitivity of different f-f transitions [4,5].…”

“…In 1962, Judd [2] and Ofelt [3] developed the theoretical basis for such analysis and proposed three parameters, with the help of which we can explain the variation of oscillator strength or the hypersensitivity of different f-f transitions [4,5]. The primary requirement for such analysis is the availability of corrected absorption spectra and the refractive index of host or solvent [1]. However, both of these quantities are very hard to calculate in case of powder hosts [6].…”