Low-temperature luminescence and thermally stimulated luminescence of BeO: Mg single crystals

Journal Article · Mon Jan 15 04:00:00 EST 2018 · Physics of the Solid State

DOI:https://doi.org/10.1134/S106378341801016X· OSTI ID:22771498

Ogorodnikov, I. N.; Ivanov, V. Yu. ^[1]

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1. Ural Federal University (Russian Federation)

Luminescence and thermally stimulated luminescence (TL) of BeO: Mg crystals are studied at T = 6–380 K. The TL glow curves and the spectra of luminescence (1.2–6.5 eV), luminescence excitation, and reflection (3.7–20 eV) are obtained. It is found that the introduction of an isovalent magnesium impurity into BeO leads to the appearance of three new broad luminescence bands at 6.2–6.3, 4.3–4.4, and 1.9–2.6 eV. The first two are attributed to the radiative annihilation of a relaxed near-impurity (Mg) exciton, the excited state of which is formed as a result of energy transfer by free excitons. The impurity VUV and UV bands are compared with those for the intrinsic luminescence of BeO caused by the radiative annihilation of self-trapped excitons (STE) of two kinds: the band at 6.2–6.3 eV of BeO: Mg is compared with the band at 6.7 eV (STE{sub 1}) of BeO, and the band at 4.3–4.4 eV is compared with the band at 4.9 eV (STE{sup 2}) of BeO. In the visible region, the luminescence spectrum is due to a superposition of intracenter transitions in an impurity complex including a magnesium ion. The manifestation of X-ray-induced luminescence bands at T = 6 K in BeO: Mg indicates their excitation during band-to-band transitions and in recombination processes. The energy characteristics of the impurity states in BeO: Mg are determined; the effect of the isovalent impurity on the fluctuation rearrangement of the BeO: Mg structure in the thermal transformation region of STE{sub 1} → STE{sub 2} is revealed.

• OSTI ID: 22771498
• Journal Information: Physics of the Solid State, Journal Name: Physics of the Solid State Journal Issue: 1 Vol. 60; ISSN 1063-7834
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNIHILATION
BERYLLIUM OXIDES
COMPARATIVE EVALUATIONS
EXCITATION
EXCITED STATES
EXCITONS
FAR ULTRAVIOLET RADIATION
FLUCTUATIONS
IMPURITIES
LUMINESCENCE
MAGNESIUM ADDITIONS
MAGNESIUM IONS
MONOCRYSTALS
RECOMBINATION
REFLECTION
SPECTRA
THERMOLUMINESCENCE
TRAPPING
X RADIATION