Self-assembly of doped semiconductor nanocrystals leading to the formation of highly luminescent nanorods |
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Authors: | K. Manzoor S.R. Vadera T.R.N. Kutty |
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Affiliation: | a Defence Laboratory, Jodhpur 342 011, India b Materials Research Center, Indian Institute of Science, Bangalore 560 012, India |
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Abstract: | Meso-scale self-assembly of doped semiconductor nanocrystals leading to the formation of monocrystalline nanorods showing enhanced photo- and electro-luminescence properties are reported. Polycrystalline ZnS: Cu+-Al3+ nanoparticles of zinc-blended (cubic) structure with an average size of ∼4 nm were aggregated in aqueous solution and grown into nanorods of length ∼400 nm and aspect ratio ∼12. Transmission electron microscope (TEM) images indicate crystal growth mechanisms involving particle-to-particle oriented-attachment assisted by sulphur-sulphur catenation leading to covalent-linkage. The nanorods exhibit self-assembly dependant luminescence properties such as quenching of the lattice defect-related emissions accompanied by enhancement of dopant-related emission, efficient low-voltage electroluminescence (EL) and super-linear voltage-brightness EL characteristics. This study demonstrates the technological importance of aggregation based self-assembly in doped semiconductor nanosystems. |
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Keywords: | Nanostructures Semiconductors Luminescence |
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