PHOTOSTIMULABLE ENERGY-TRANSFER IN DOPED NANOSTRUCTURES OF ALKALI-HALIDES

In nanostructures of doped alkali halides, unrelaxed K-centres produce d in the exciton decay are able to escape from the surface thus produc ing in the grains of polycrystalline film an excess concentration of F -centres, which has a great tendency to form an interacting F-centre c hain or a canal. Role of this F-centre chain in photostimulable energy transfer is analysed. It is concluded that specific interaction of un relaxed H-centres and electrons with the F-centre chain (or the canal) leads to the temperature-independent exciton or electron transport at any distance. Hence, the temperature-independent photostimulated lumi nescence (PSL) response production and retrieval are experimentally ob served. (C) 1998 Published by Elsevier Science B.V. All rights reserve d.