CROSS-LUMINESCENCE OF SEVERAL COMPLEX FLUORIDES EXCITED BY SYNCHROTRON-RADIATION

Time-resolved luminescence characteristics of the two groups of comple x cross-luminescent (CRL) fluorides, namely, BaF2-based (BaY2F8, BaY2F 8-RE(3+) (RE = Ce, Nd, Er, Tm, Yb)) and KF-based fluorides (KYF4, KLuF 4, K2YF2, KLiYF5, KLiLuF5, and K2LiGaF6) have been investigated under pulsed synchrotron radiation excitation at 100 K and 300 K. It was fou nd that in BaY2F8 the emission of self-trapped excitons was considerab ly quenched at 300 K compared with that of BaF2 and the present ''slow '' emission was caused by uncontrollable rare earth admixtures. In Yb3 +-doped BaY2F8 this emission is strongly quenched providing good fast scintillation characteristics. The studied KF-based complex crystals s how intensive CRL at 300 K with the spectrum situated mainly in the fa r VUV spectral range. Data on the new CRL crystals KLiYF5 and KLiLuF5 are reported.