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Anomalous temperature dependence of near‐infrared photoluminescence band in neutron‐irradiated α‐Al 2 O 3
Author(s) -
Rahman Abu Zayed Mohammad Saliqur,
Wei Long,
Yang Tao,
Xu Qiu,
Atobe Kozo
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201330660
Subject(s) - photoluminescence , irradiation , atmospheric temperature range , materials science , neutron , near infrared spectroscopy , intensity (physics) , analytical chemistry (journal) , infrared , spectral line , phonon , range (aeronautics) , optoelectronics , optics , chemistry , physics , condensed matter physics , nuclear physics , chromatography , astronomy , meteorology , composite material
The properties of near‐infrared (NIR) photoluminescence (PL) spectra in a range of 0.8–2.8 μm in fast neutron‐irradiated α‐Al 2 O 3 are reported. Anomalous temperature dependence of NIR PL spectra was observed in neutron‐irradiated α‐Al 2 O 3 for the first time. Highest PL intensity was measured at 260 K whereas the intensity at low temperatures below 220 K decreased significantly. Phonon‐assisted indirect radiative recombination may be responsible for PL intensity enhancement at near room temperature. NIR PL band in a range of 0.8–2.8 μm may be well suited for application in broadly tunable color‐center laser because of its enhanced PL intensity at near room temperature.