Excitation of self-trapped-exciton luminescence in the recombination of frenkel defects in BeO

S. V. Gorbunov, V. Yu Yakovlev

Research output: Contribution to journalArticle

Abstract

Polarized luminescence and transient optical absorption (TOA) induced by pulsed electron irradiation in beryllium oxide crystals were studied. Exponential stages with decay times τ = 6.5 ms were observed to exist in luminescence bands at 4.0, 5.0, and 6.7 eV, which coincide in spectral composition and polarization characteristics with the luminescence of self-trapped excitons (STEs) of two types. The formation efficiency of centers with a 6.5-ms decay time is comparable to that of triplet STEs. The general characteristics of the kinetics and the decay times of the TOA of these centers do not depend on electron fluence and are governed by the monomolecular recombination process. The spectra of TOA centers with a decay time of 6.5 ms were found to be similar to those of V-type hole centers and STE hole components. The mechanism by which recombination of closely spaced, spatially correlated Frenkel pairs, Be+ and V- centers, brings about an exponential component with a 6.5-ms decay time in the luminescence of STEs of two types in BeO is discussed.

Original languageEnglish
Pages (from-to)627-631
Number of pages5
JournalPhysics of the Solid State
Volume47
Issue number4
DOIs
Publication statusPublished - 2005

Fingerprint

Frenkel defects
Excitons
Luminescence
excitons
Light absorption
luminescence
Defects
decay
optical absorption
excitation
Beryllia
Electron irradiation
beryllium oxides
polarization characteristics
electron irradiation
Polarization
fluence
Crystals
Kinetics
LDS 751

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Excitation of self-trapped-exciton luminescence in the recombination of frenkel defects in BeO. / Gorbunov, S. V.; Yakovlev, V. Yu.

In: Physics of the Solid State, Vol. 47, No. 4, 2005, p. 627-631.

Research output: Contribution to journalArticle

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