Abstract
The spectroscopic properties of LiKGdF 5 crystals doped with Er 3+ or Tm 3+ and codoped with Dy 3+, Tb 3+ or Sm 3+, and of LiKYF 5 crystals doped with Er 3+ or Tm 3+ and codoped with Dy 3+ have been studied under excitation by vacuum ultraviolet (VUV) radiation. It has been found that in LiKGdF 5 crystals doped with Er 3+ or Tm 3+ the VUV energy absorbed by 4f–5d transitions in the Er 3+ or the Tm 3+ ion is nearly completely converted into the UV/visible emission. At least in the LiKGdF 5: Er 3+ crystal some part of such a conversion is due to the energy transfer from the 5d state of the Er 3+ ion to the neighboring Gd 3+ ion as a result of cross-relaxation giving rise to the emission of two UV/visible photons instead of one VUV quantum. LiKGdF 5 crystals doped with Er 3+ and codoped with Dy 3+, Tb 3+ or Sm 3+ can be considered as promising materials for phosphors excited by VUV radiation from noble gas discharge.
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