Broadband coherent emission observed in polycrystalline CdSSe nanowires under high excitation

Broadband coherent emission observed in polycrystalline CdSSe nanowires under high excitation
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高激发下多晶 CdSSe 纳米线中观察到的宽带相干发射

DOI:
10.1088/0953-8984/21/37/375302
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发表时间:
2009-09
影响因子:
2.7
通讯作者:
Wang, Q.
Wang, Q.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
He, P. B.;Pan, A. L.;Liu, R. B.;Zou, B. S.;Cao, J. H.;Li, Z. A.;Zhang, Q. L.;Wang, Q.

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采用低温物理蒸发法制备了多晶CdSSe纳米线。结合HRTEM和XRD的结构分析表明,这些制备的线具有六方纤锌矿结构与多晶性质。局部激发的光学测量表明,虽然这些线仍然可以作为波导腔,它们的多晶性质将引起显着的红移发射的光在其传输过程中沿着他们。功率依赖的光致发光测量表明,这些多晶线可以实现宽带相干发射的带边带在高激发下,这显示出显着的对比,在单晶纳米线中观察到的更窄的和多模光谱具有相同的元素组成。时间分辨光致发光进一步证实了这些线中相干发射的发生,这源于高激发下产生的高密度载流子的电子空穴等离子体(EHP)复合。这类具有宽带相干发射的多晶合金纳米线在纳米级波长可调谐发光器件中具有潜在的应用前景。
Polycrystalline CdSSe nanowires were prepared with a low-temperature physical evaporation method. Structural analysis combining HRTEM with XRD demonstrate that these as-prepared wires have a hexagonal wurtzite structure with a polycrystalline nature. Locally excited optical measurements show that though these wires can still act as waveguide cavities, their polycrystalline nature will induce a significant redshift of the emitted light during its transportation along them. Power dependent photoluminescence measurement shows that these polycrystalline wires can achieve broadband coherent emission at the band-edge band under high excitation, which shows marked contrast with the much narrower and multimode spectra observed in the single-crystalline nanowires with the same elemental composition. Time-resolved photoluminescence further confirms the occurrence of coherent emission in these wires, which originates from the electron–hole plasma (EHP) recombination of high-density carriers generated under high excitation. These kinds of polycrystalline alloy nanowires with broadband coherent emission should have potential uses in nano-scaled wavelength tunable light-emitting devices.
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