Luminescent characteristics of pure and Ce doped K 2LaCl 5 phase in KCl host

Abstract

The formation of Ce 3+ doped K 2LaCl 5 microphase has been revealed for the KCl-LaCl 3-CeCl 3 system. Luminescent characteristics of pure and Ce 3+ doped K 2LaCl 5 microcrystals, embedded in KCl matrix, are studied in comparison with those of bulk K 2LaCl 5:Ce(0.1%) crystal. For both the microand bulk K 2LaCl 5:Ce crystals the bands peaked at 344 and 373 nm are attributed to Ce 3+ emission revealing a 24 ns time constant for the main decay component upon the excitation within the Ce 3+ f-d absorption range. The method elaborated for the synthesis of the activated K 2LaCl 5 microphase in the KCl-LaCl 3-CeCl 3 system provides the possibility of producing large-size homogeneous scintillation elements possessing efficient emission of rare earth doped A 2LaX 5 micro- and nano-phases embedded in AX matrices (A = Cs, K, Rb; X = F, Cl, Br, I). © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.