Abstract
Spectroscopic properties and energy transfer mechanisms for isostructural fluoride K2YF5 and K2GdF5 crystals singly and doubly doped with different concentrations of Tb3+ and Sm3+ ions have been investigated under excitation in the deep ultraviolet (DUV) and vacuum UV (VUV) spectral regions. In these hosts luminescence of Sm3+ ions is enhanced under DUV excitation by doping with Tb3+ ions, namely, the Sm3+ excitation spectra show additional intense excitation in the region of Tb3+ spin-allowed 4f – 5d transitions at 200–220 nm due to energy transfer from Tb3+ to Sm3+. The decay curves of Tb3+ ion luminescence have been measured at room temperature for the series of samples containing different concentration of Sm3+ and have been fitted by the Inokuti-Hirayama model. The results have revealed that the dipole-dipole interaction is the dominant interaction mechanism in the energy transfer process from Tb3+ to Sm3+ ions. The probability (WET) and the efficiency (EET) of energy transfer from Tb3+ to Sm3+ increase depending on the Sm3+ concentration in these crystals.
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