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Dynamic Fluctuations in Ultrasmall Nanocrystals Induce White Light Emission
Individual ultrasmall CdSe nanocrystals have recently been found to emit white light, but the ultimate origin of the phenomenon has remained elusive. Here we use a combination of state-of-the-art experiment and theory to show that excitation sets the ultrasmall nanocrystals into a fluxional state. T...
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| Published in: | Nano letters 2012-06, Vol.12 (6), p.3038-3042 |
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| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
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| cited_by | cdi_FETCH-LOGICAL-a471t-cea9650ff095a7fd78bb988842df77507583767637586f3de8dc96764749f7673 |
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| cites | cdi_FETCH-LOGICAL-a471t-cea9650ff095a7fd78bb988842df77507583767637586f3de8dc96764749f7673 |
| container_end_page | 3042 |
| container_issue | 6 |
| container_start_page | 3038 |
| container_title | Nano letters |
| container_volume | 12 |
| creator | Pennycook, Timothy J McBride, James R Rosenthal, Sandra J Pennycook, Stephen J Pantelides, Sokrates T |
| description | Individual ultrasmall CdSe nanocrystals have recently been found to emit white light, but the ultimate origin of the phenomenon has remained elusive. Here we use a combination of state-of-the-art experiment and theory to show that excitation sets the ultrasmall nanocrystals into a fluxional state. Their energy gaps vary continuously on a femtosecond time scale, so that even an individual nanocrystal can emit across the entire visual range. In addition, we observe the outer layers of the larger monochromatic emitting nanocrystals to be fluxional. Such fluxionality should be considered when optimizing nanocrystals for applications. Thus, small is indeed different, but ultrasmall is different yet again. |
| doi_str_mv | 10.1021/nl3008727 |
| format | article |
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| fulltext | fulltext |
| identifier | ISSN: 1530-6984 |
| ispartof | Nano letters, 2012-06, Vol.12 (6), p.3038-3042 |
| issn | 1530-6984 1530-6992 |
| language | eng |
| recordid | cdi_osti_scitechconnect_1055011 |
| source | American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list) |
| subjects | Cadmium Compounds - chemistry Color Cross-disciplinary physics: materials science rheology Emission Emittance Energy gap Exact sciences and technology Femtosecond Fluctuation Lighting - methods Materials science Materials Testing Nanocrystalline materials Nanocrystals Nanoscale materials and structures: fabrication and characterization Nanostructures - chemistry Nanostructures - ultrastructure Optimization Particle Size Physics Selenium Compounds - chemistry Visual White light |
| title | Dynamic Fluctuations in Ultrasmall Nanocrystals Induce White Light Emission |
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