Time-resolved luminescent VUV-spectroscopy of pure and doped by rare earth ions crystals of strontium fluoride
نویسنده
چکیده
The spectroscopic properties SrF2–Eu(1%), SrF2–Er(1%) and nominal pure SrF2 crystals have been studied using time-resolved vacuum ultraviolet (VUV) spectroscopy under pulsed synchrotron radiation excitation. The 4f24f 5d (f–d) and 4f24f (f f) excitation spectra and emission spectra (with and without of time resolution) have been investigated in the wide energy region at 8 and 295K. Moreover, the emission and excitation behaviors of intrinsic luminescence SrF2 have been studied at 8K, when the fast and slow components given by singlet and triplet relaxation of self-trapped excitons (STE) are observed. Special attention is devoted to VUV emission of Er-doped SrF2 due to spin-allowed and spin-forbidden 4f 5d-4f transitions. r 2005 Elsevier B.V. All rights reserved. PACS: 76.30.Kg; 71.35.Cc; 71.20.Dg; 78.47.+p
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VUV spectroscopy of wide band-gap crystals doped with rare earth ions
Spectral and kinetic properties of vacuum ultraviolet (VUV) luminescence from different fluoride crystals doped with Nd, Er or Tm are discussed. Concentration quenching of VUV luminescence, the impact mechanism of the energy transfer from the matrix to the emission centers as well as nonradiative relaxation processes in the rare earth ions have been detected and studied. The crystal properties ...
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