Transient optical absorption and luminescence in Li2B4O7 lithium tetraborate

I. N. Ogorodnikov, V. Yu Yakovlev, A. V. Kruzhalov, L. I. Isaenko

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

This paper reports on a study of the transient optical absorption exhibited by Li2B4O7 (LTB) in the visible and UV spectral regions. Using absorption optical spectroscopy with nanosecond time resolution, it is established that the transient optical absorption (TOA) in these crystals originates from optical transitions in hole centers and that the kinetics of the optical-density relaxation is controlled by interdefect tunneling recombination, which involves these hole centers and electronic Li0 centers representing neutral lithium atoms. At 290 K, the Li0 centers migrate in a thermally stimulated, one-dimensional manner, without carrier ejection into the conduction or valence band. The kinetics of the pulsed LTB cathodoluminescence is shown to be controlled by a relaxation process connected with tunneling electron transfer from a deep center to a small hole polaron migrating nearby, a process followed by the formation of a self-trapped exciton (STE) in an excited state. Radiative annihilation of the STE accounts for the characteristic σ-polarized LTB luminescence at 3.6 eV, whose kinetics is rate-limited by the tunneling electron transfer.

Original languageEnglish
Pages (from-to)1085-1092
Number of pages8
JournalPhysics of the Solid State
Volume44
Issue number6
DOIs
Publication statusPublished - 1 Jun 2002

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Light absorption
Luminescence
Lithium
optical absorption
Electron tunneling
lithium
luminescence
Excitons
Kinetics
Gene Conversion
Optical transitions
Density (optical)
Cathodoluminescence
Relaxation processes
Valence bands
Conduction bands
electron transfer
kinetics
Excited states
excitons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Transient optical absorption and luminescence in Li2B4O7 lithium tetraborate. / Ogorodnikov, I. N.; Yakovlev, V. Yu; Kruzhalov, A. V.; Isaenko, L. I.

In: Physics of the Solid State, Vol. 44, No. 6, 01.06.2002, p. 1085-1092.

Research output: Contribution to journalArticle

Ogorodnikov, I. N. ; Yakovlev, V. Yu ; Kruzhalov, A. V. ; Isaenko, L. I. / Transient optical absorption and luminescence in Li2B4O7 lithium tetraborate. In: Physics of the Solid State. 2002 ; Vol. 44, No. 6. pp. 1085-1092.
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