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Time-resolved photoluminescence of Zn(OH)_2 and its composites with graphite oxides

机译:Zn(OH)_2及其与石墨氧化物复合材料的时间分辨光致发光

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摘要

Time-resolved photoluminescence is used to determine carrier recombination through radiative and nonradiative processes in zinc hydroxide Zn(OH)_2 and its porous composites with graphite oxide (GO). The decay times, measured by a streak camera, are found to be larger for zinc hydroxide (~1215 ± 156 ps) than its composites (~976 ± 81 ps for ZnGO-2 and 742 ± 59 ps for ZnGO-5), but no significant changes in rise times (from 4.0 to 5.0 ps) are recorded. The dominant mechanism for the radiative process is attributed to free carrier recombination, while microporous networks present in these materials are found to be pathways for the nonradiative recombination process via multiphonon emission.
机译:时间分辨的光致发光用于确定在氢氧化锌Zn(OH)_2及其与氧化石墨(GO)的多孔复合材料中通过辐射和非辐射过程进行的载流子复合。用条纹相机测量的衰减时间发现,氢氧化锌(〜1215±156 ps)大于其复合材料(ZnGO-2为〜976±81 ps,ZnGO-5为742±59 ps),但是,没有记录上升时间(从4.0到5.0 ps)的显着变化。辐射过程的主要机理归因于自由载流子的重组,而发现这些材料中存在的微孔网络是通过多声子发射进行非辐射重组过程的途径。

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