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Visible photoluminescence from MgAlO spinel with cation disorder and oxygen vacancy

Journal of Applied Physics, ISSN: 0021-8979, Vol: 112, Issue: 10
2012
  • 77
    Citations
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  • 38
    Captures
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Metrics Details

  • Citations
    77
    • Citation Indexes
      77
  • Captures
    38

Article Description

Magnesium aluminate spinel, MgAlO, is a structurally and compositionally interesting crystal since it can exhibit significant deviations from the stoichiometric composition because of the ability of the lattice to tolerate substantial cation disorder. We show that MgAlO spinels with excess AlO non-stoichiometry can accommodate a large amount of positively charged oxygen vacancies (F centers) when they are heated under vacuum at ∼1900°C using a high-frequency induction heating unit with a graphite crucible. Thus the obtained spinels show a bluish white photoluminescence (PL) with a PL quantum yield of ∼20, which is attributed to excitation and recombination processes of the F center. The PL signal is characterized by a broad spectral band peaking at ∼2.7 eV (∼460 nm) and decays in a nonexponential manner on the time scale of several tens of microseconds. The F center is supposed to interact with nearby positively and negatively charged defects derived from cation disorder in the spinel structure, forming clusters of various defect centers. © 2012 American Institute of Physics.

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