Transient optical absorption and luminescence in Li2B4O7 lithium tetraborate

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

Результат исследования: Материалы для журналаСтатья

16 Цитирования (Scopus)

Аннотация

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.

Язык оригиналаАнглийский
Страницы (с... по...)1085-1092
Количество страниц8
ЖурналPhysics of the Solid State
Том44
Номер выпуска6
DOI
Статус публикацииОпубликовано - 1 июн 2002

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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