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《Photonics Research》 2015年05期
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Laser-annealing-made amplified spontaneous emission of "giant" CdSe/CdS core/shell nanocrystals transferred from bulk-like shell to quantum-confined core

Chen Liao  Kai Fan  Ruilin Xu  Huichao Zhang  Changgui Lu  Yiping Cui  Jiayu Zhang  
【摘要】:"Giant" Cd Se/Cd S core/shell nanocrystals(NCs) were synthesized with thick Cd S shell(15 monolayers), and the x-ray diffraction(XRD) measurement indicates there is a zinc blende phase in the thick Cd S shell, whereas it transformed into wurtzite phase under 5 min radiation with a 400 nm, 594 μJ∕cm2femtosecond(fs) laser beam.The evolution of the NCs' spontaneous emission under the fs laser radiation was recorded with a Hamamatsu streak camera. The as-synthesized NCs exhibit an amplified spontaneous emission(ASE) at 530 nm, which comes from a bulk-like Cd S shell due to the interfacial potential barrier, which could slow down the relaxation of holes from the shell to the core. After being annealed by an fs laser, the ASE of the g-NCs is transferred from a bulk-like Cd S shell to a quantum-confined Cd Se core because the phase transformation determined with the XRD measurement could remove the interfacial barrier. Besides the ASE at 643 nm, two shorter-wavelength ASE peaks at 589 and 541 nm, corresponding to optical transitions of the second(1P) and third(1D) electron quantization shells of the Cd Se core, also appear, thus indicating that Auger recombination is effectively suppressed.
【作者单位】Advanced
【关键词】confined;spontaneous;annealing;relaxation;annealed;transferred;camera;thick;Giant;suppressed;
【基金】:supported by the National Basic Research Program of China (973 Program, 2012CB921801) the Science and Technology Department of Jiang Su Province (BE2012163) the Scientific Research Foundation of Graduate School of Southeast University (YBJJ1443)
【分类号】:O734;TB383.1
【正文快照】:
1.INTRODUCTIONbarrier,relaxation of“hot”holes from the shell(which hasDue to the quantum confinement effect,colloidal semiconduc-a much greater absorption cross section than the core[5])tor nanocrystals(NCs)exhibit various advantageous proper-to the co

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