After-glow, thermoluminescence and photoluminescence efficiencies in KCl:Eu

were investigated using samples which had been annealed at 773K, with a high

Eu–vc dipole concentration, samples aged at 373K with a high aggregate

concentration and plastically deformed samples enriched with dislocations. The

after-glow and thermoluminescence efficiencies increase markedly for samples

with a high concentration of aggregates. Plastically deformed samples exhibited a

greater after-glow and thermoluminescence efficiency, as compared with

undeformed samples. However, the formation of aggregates during aging was

strongly reduced in deformed samples. The low-temperature peaks in the

thermoluminescence glow curve were absent from deformed and aged samples.

These results were interpreted as being evidence for the participation of

dislocations in the after-glow process, and the relatively high after-glow efficiency of aggregates was attributed to the preferential formation of aggregates along

dislocations.

On the Role of Dislocations and Aggregates in UV Induced Afterglow

Luminescence of KCl:Eu at Low Temperatures. S.Alvarez-Garcia, T.M.Piters,

R.Perez-Salas, M.Barboza-Flores: Journal of Physics - Condensed Matter, 2008,

20[8], 085203