Print Email Facebook Twitter Direct evidence for the participation of band-tails and excited-state tunnelling in the luminescence of irradiated feldspars Title Direct evidence for the participation of band-tails and excited-state tunnelling in the luminescence of irradiated feldspars Author Poolton, N.R.J. Kars, R.H. Wallinga, J. Bos, A.J.J. Faculty Applied Sciences Department RRR/Radiation, Radionuclides and Reactors Date 2009-12-31 Abstract The significance and extent of band-tail states in the luminescence and dosimetry properties of natural aluminosilicates (feldspars) is investigated by means of studies using low temperature (10 K) irradiation and optically stimulated luminescence (OSL) stimulation spectroscopy, and thermoluminescence (TL) in the range 10–200 K, made in comparison with high temperature (300 K) irradiation and photo-transferred OSL and TL investigations undertaken at low temperature. These measurements allow mappings of the band-tails to be made; they are found to be ?0.4 eV in extent in the typical materials studied. Furthermore, by populating charge trapping centres at high temperature (300 K) and monitoring the OSL stimulation spectra at temperatures in the range 10–300 K, clear evidence is presented for the presence of both thermally activated and non-thermally activated OSL processes; it is argued that the former result from thermally activated hopping through the band-tail states, whilst the latter are due to tunnelling processes, either from the excited state of the OSL centres or through the tail states. The spectral measurements are supported by analysis of the temporal dependence of the OSL signals, which correspond to either tunnelling or general order kinetic decay processes. To reference this document use: http://resolver.tudelft.nl/uuid:e7bb524b-b423-4769-a878-f0f45bcf51d9 DOI https://doi.org/10.1088/0953-8984/21/48/485505 Publisher Institute of Physics ISSN 0953-8984 Source http://iopscience.iop.org/0953-8984/21/48/485505 Source Journal of physics. Condensed matter, 21 Part of collection Institutional Repository Document type journal article Rights (c)2009 The Authors; Institute of Physics Files PDF Poolton.pdf 822.08 KB Close viewer /islandora/object/uuid:e7bb524b-b423-4769-a878-f0f45bcf51d9/datastream/OBJ/view