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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Amorphous carbon luminescence; excitation and emission in a broad energy range
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Amorphous carbon luminescence; excitation and emission in a broad energy range

机译：非晶碳发光;在宽泛的能量范围内激发和发射

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Photoluminescence excitation (PLE) spectra at photon energies of 2.47 to 5.63 eV have been obtained for hydrogenated amorphous carbon samples (a-C:H) deposited by radio frequency glow-discharge decomposition of methane at 0 V self bias. A peak in the PLE spectra was observed at similar to 3.0 eV excitation energy, above which the luminescence intensity slowly decreases with photon energy. Photoluminescence (PL) spectra with a peak at 2.34 eV show similar asymmetric line-shape and peak energy when the excitation photon energy decreases from 5.6 eV to 2.5 eV. The highest photon energy which excites the characteristic PL band is 5.63 eV. Our results demonstrate that light-emitting electron hole pairs remain strongly localized even at excitation energies much higher than the optical gap. A new localization mechanism based on symmetry differences between sigma and pi bonds is proposed. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 15]
机译：对于通过在0 V自偏压下甲烷的射频辉光放电分解沉积的氢化非晶碳样品（a-C：H），已获得了光子能量为2.47至5.63 eV的光致发光激发（PLE）光谱。在PLE光谱中观察到一个峰值，其激发能量与3.0 eV相似，在该峰值以上，发光强度随光子能量而缓慢降低。当激发光子能量从5.6 eV降低到2.5 eV时，峰值为2.34 eV的光致发光（PL）光谱显示出相似的不对称线形和峰值能量。激发特征PL波段的最高光子能量为5.63 eV。我们的结果表明，即使在比光隙高得多的激发能下，发光电子空穴对仍然保持强定位。提出了一种基于σ和π键对称性差异的新型定位机制。 （C）1998 Elsevier Science B.V.保留所有权利。 [参考：15]

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