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    The photoluminescence/excitation (PL/E) spectroscopy of Eu-implanted GaN

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    Type
    Conference Paper
    Authors
    O'Donnell, Kevin Peter
    Roqan, Iman S. cc
    Wang, Ke
    Lorenz, Katharina
    Alves, Eduardo Jorge
    Boćkowski, Michał X.
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Semiconductor and Material Spectroscopy (SMS) Laboratory
    Date
    2011-05
    Permanent link to this record
    http://hdl.handle.net/10754/575801
    
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    Abstract
    Several distinct luminescent centres form in GaN samples doped with Eu. One centre, Eu2, recently identified as the isolated, substitutional Eu impurity, EuGa, is dominant in ion-implanted samples annealed under very high pressures (1 GPa) of N2. According to structural determinations, such samples exhibit an essentially complete removal of lattice damage caused by the implantation process. A second centre, Eu1, probably comprising EuGa in association with an intrinsic lattice defect, produces a more complex emission spectrum. In addition there are several unidentified features in the 5D0 to 7F2 spectral region near 620 nm. We can readily distinguish Eu1 and Eu2 by their excitation spectra, in particular through their different sensitivities to above-gap and below-gap excitation. The present study extends recent work on photoluminescence/ excitation (PL/E) spectroscopy of Eu1 and Eu2 to arrive at an understanding of these mechanisms in terms of residual optically active defect concentrations. We also report further on the 'host-independent' excitation mechanism that is active in the case of a prominent minority centre. The relevance of this work to the operation of the red GaN:Eu light-emitting diode is discussed. © 2010 Elsevier B.V. All rights reserved.
    Citation
    O’Donnell, K. P., Roqan, I. S., Wang, K., Lorenz, K., Alves, E., & Boćkowski, M. (2011). The photoluminescence/excitation (PL/E) spectroscopy of Eu-implanted GaN. Optical Materials, 33(7), 1063–1065. doi:10.1016/j.optmat.2010.07.002
    Publisher
    Elsevier BV
    Journal
    Optical Materials
    Conference/Event name
    Rare earth doped materials for optical based technologies Symposium K of the 2010 EMRS Spring Meeting
    DOI
    10.1016/j.optmat.2010.07.002
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.optmat.2010.07.002
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