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Spectroscopic properties of nonlinear optical LiGaTe_2 crystal

机译:非线性光学LiGaTe_2晶体的光谱性质

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摘要

The nonlinear crystal LiGaTe_2 (LGT) with chalcopyrite structure was grown by the Bridgman-Stockbarger technique. LGT is transparent in the 0.52-16 μm range. Fundamental absorption edge is due to direct allowed transitions; Band gap values are 2.65 and 2.41 eV at 80 and 300 K, respectively. Vibrational, Raman and IR absorption spectra demonstrate four groups of lines in the 50-350 cm~(-1). Intense orange photoluminescence (PL) in a broad 605 nm band, excited at band-to-band transitions and quenched in the 180-250 K range is related to self-trapped excitons. Weaker PL components at 510, 729 and 898 nm are associated supposedly with F-centers and their complexes. According to PL excitation spectra valence band is split into three components: Γ_7(A), Γ_6(B) and Γ_7(C), from which electrons are excited to the bottom of the conduction band Γ_6. The crystal field splitting ( Δ_(CF)) and the spin-orbit splitting (Δ_(SO)) were determined to be -0.75, and 0.62 respectively, at liauid nitrogen temperature.
机译:通过Bridgman-Stockbarger技术生长了具有黄铜矿结构的非线性晶体LiGaTe_2(LGT)。 LGT在0.52-16μm范围内是透明的。基本吸收边缘是由于直接允许的跃迁引起的;在80和300 K时,带隙值分别为2.65 eV和2.41 eV。振动,拉曼和红外吸收光谱表明在50-350 cm〜(-1)范围内有四组线。在605 nm宽频带中强烈的橙色光致发光(PL),在带间跃迁中激发并在180-250 K范围内猝灭与自陷激子有关。 510、729和898 nm处较弱的PL成分可能与F中心及其复合物有关。根据PL激发谱,价带被分为三个部分:Γ_7(A),Γ_6(B)和Γ_7(C),电子从中被激发到导带Γ_6的底部。确定在氮化氮温度下的晶体场分裂(Δ_(CF))和自旋轨道分裂(Δ_(SO))分别为-0.75和0.62。

著录项

  • 来源
    《Optical Materials》 |2015年第4期|276-280|共5页
  • 作者单位

    Institute of Geology and Mineralogy Russian Acad Sci Siberian Branch 3 Academician Koptyug Ave 630090 Novosibirsk Russia;

    Institute of Geology and Mineralogy Russian Acad Sci Siberian Branch 3 Academician Koptyug Ave 630090 Novosibirsk Russia Novosibirsk State University 2 Pirogova Str. 630090 Novosibirsk Russia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    LiGaTe_2; Growth; Absorption; Luminescence; Raman scattering;

    机译:LiGaTe_2;成长;吸收发光;拉曼散射;

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