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

The formation of Ce 3+ doped K 2 LaCl 5 microphase has been revealed for the KCl–LaCl 3 –CeCl 3 system. Luminescent characteristics of pure and Ce 3+ doped K 2 LaCl 5 microcrystals, embedded in KCl matrix, are studied in comparison with those of bulk K 2 LaCl 5 :Ce(0.1%) crystal. For both the micro‐ and bulk K 2 LaCl 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 2 LaCl 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 2 LaX 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)