Print Email Facebook Twitter Luminescence quenching by photoionization and electron transport in a LaAlO3:Ce3+ crystal Title Luminescence quenching by photoionization and electron transport in a LaAlO3:Ce3+ crystal Author Van der Kolk, E. De Haas, J.T.M. Bos, A.J.J. Van Eijk, C.W.E. Dorenbos, P. Faculty Applied Sciences Department Radiation, Radionuclides and Reactors Date 2007-04-18 Abstract A combined photoconductivity, absorption, and thermoluminescence study was performed to understand the absence of luminescence from Ce3+ in LaAlO3:Ce3+. It is demonstrated that the absence of luminescence is the result of Ce3+ ionization from the 5d excited states, which are all located in the conduction band. Ce3+ ionization is accompanied by the formation of several broad absorption and photoconductivity bands, which are assigned to electron traps. A time and temperature dependent optical investigation of these traps reveals the conditions under which electrons are transferred from Ce3+ to traps and vice versa, from traps back to Ce4+. The observed difference in energy needed to thermally or optically release electrons from traps is qualitatively explained in terms of the location of the ground and excited states of the electron traps with respect to the conduction band. Subject lanthanum compoundsceriumphotoconductivitythermoluminescenceimpurity absorption spectraelectron trapsconduction bandsphotoionisation To reference this document use: http://resolver.tudelft.nl/uuid:552dd9da-1f1c-4667-b10e-c4e1aab3aafc DOI https://doi.org/10.1063/1.2715748 Publisher American Institute of Physics ISSN 0021-8979 Source http://link.aip.org/link/JAPIAU/v101/i8/p083703/s1 Source Journal of Applied Physics, 101 (8), 2007 Part of collection Institutional Repository Document type journal article Rights (c) 2007 The Author(s); American Institute of Physics Files PDF vanderKolk_2007.pdf 376.86 KB Close viewer /islandora/object/uuid:552dd9da-1f1c-4667-b10e-c4e1aab3aafc/datastream/OBJ/view