Rate equation analysis and energy transfer of Er3+-doped Ga 2S3-GeS2-La2S3 glasses

Kohei Kadono, Tetsuo Yazawa, Shibin Jiang, Jérôme Porque, Bor Chyuan Hwang, Nasser Peyghambarian

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33 Scopus citations

Abstract

Decay curves of 1.5 μm (4I13/2) and 1.0 μm (4I11/2) emissions from Er3+ ions in Ga 2S3-GeS2-La2S3 glasses were measured by the excitation of a 1.5 μm and a 980 nm laser diode pump. The decay curves were simulated using rate equations for a model consisting of six levels of the Er3+ from the ground state. The rate equations contained five unknown parameters, i.e., excited state absorption cross sections of 4I13/24I9/2esa24) for 1.5 μm excitation and 4I 11/24F7/2esa36) for 980 nm excitation, cooperative upconversion coefficients of ( 4I13/2, 4I13/2) → ( 4I9/2, 4I15/2) (C2) and (4I11/2, 4I11/2) → ( 4F7/2, 4I15/2) (C3), and an energy back-transfer coefficient of (4I9/2, 4I15/2) → (4I13/2, 4I13/2) (C2r). These parameters were estimated by fitting the simulated curves to the measured ones. The obtained values were σesa24 = 0.3 × 10-20 cm2, σesa36 = 0.5 × 10-20 cm2, C 2 = 30-40 × 10-18 cm3/s, C3 = 20-25 × 10-18 cm3/s, and C2r = 5 × 10-18 cm3/s.

Original languageEnglish (US)
Pages (from-to)79-90
Number of pages12
JournalJournal of Non-Crystalline Solids
Volume331
Issue number1-3
DOIs
StatePublished - Dec 1 2003

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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