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The properties of various inorganic scintillator materials with different origin of their VUV luminescence have been studied under pulsed excitation by XUV (50-1000 eV) synchrotron radiation. A comparison of spectral and timing characteristics of these crystalline VUV emitters has been performed. The processes of energy transfer from the host crystal to the luminescence centers of different nature were analyzed from the features of excitation spectra in the regions of inner-shell absorption. Index Terms--Crossluminescence, excitous, fast VUV luminescence, inorganic scintillators, rare earth ions, synchrotron radiation.

Excitation spectra of Ca[F.sub.2], Sr[F.sub.2] and Ba[F.sub.2] crystals doped by Cd[F.sub.2], La[F.sub.3], Y[F.sub.3] in vacuum ultraviolet region were investigated at liquid-helium temperature and at room temperature. Spectra of doped Ba[F.sub.2] at low temperature and Ca[F.sub.2], Sr[F.sub.2] at room temperature show significant decrease of excitation intensity against those in undoped crystals while the intensifies in exciton regions remain nearly the same. The common reason of the suppression of exciton emission by impurity in alkaline-earth fluorides is unradiative electron-hole recombination on impurity sites. Index Terms--Excitons, impurity, suppression, vacuum ultraviolet.