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Ultralong Homogeneously Alloyed CdSe x S 1‐x Nanowires with Highly Polarized and Color‐Tunable Emissions
Author(s) -
Yang Gaoling,
Zhong Haizheng,
Bai Zelong,
Liu Ruibin,
Zou Bingsuo
Publication year - 2014
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201400138
Subject(s) - nanowire , materials science , photoluminescence , exciton , semiconductor , optoelectronics , wafer , polarization (electrochemistry) , absorption (acoustics) , photonics , quantum dot , fabrication , nanotechnology , condensed matter physics , chemistry , medicine , physics , alternative medicine , pathology , composite material
Colloidal semiconductor nanowires are attractive materials with polarized light absorption and emissions. Solution synthesis of ultralong (several tens of micrometers) colloidal CdSe x S 1‐x nanowires with homogeneously alloyed composition through a solution–liquid–solid (SLS) method are reported. By varying the ratio of Se/S, the optical band and their corresponding photoluminescence spectra of the CdSe x S 1‐x nanowires can be finely tuned from 508 nm (ca. 2.45 eV) to 628 nm (ca. 2.0 eV). In comparison with the low quantum yields of pure CdS and CdSe nanowires (less than 0.1%), alloyed CdSe x S 1‐x nanowires exhibit enhanced bright photoluminescence emission with a narrow spectral width of 25–31 nm and moderate quantum yields up to ca. 8.8%. Moreover, the randomly oriented ensembles on glass wafers show strong polarized emission with polarization values of ca. 0.6 due to the inherent larger aspect ratio. The combination of these characteristics in alloyed nanowires sets the basis for the spectroscopic study of 1D excitons, as well as the fabrication of nanowire‐based polarized photonic and optoelectronic devices.