| On the Origin of Photoluminescence in Silicon Nanocrystals: Pressure-Dependent Structural and Optical Studies. | |
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MedLine Citation:
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PMID: 22757779 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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A lack of consensus persists regarding the origin of photoluminescence in silicon nanocrystals. Here we report pressure-dependences of x-ray diffraction and photoluminescence from alkane-terminated colloidal particles. We determine the diamond-phase bulk modulus, observe multiple phase transitions, and importantly find a systematic photoluminescence red-shift that matches the Xconduction-to-valence transition of bulk crystalline silicon. These results, reinforced by calculations, suggest that the efficient photoluminescence, frequently attributed to defects, arises instead from core-states that remain highly indirect despite quantum confinement. |
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Authors:
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Daniel C Hannah; Jihua Yang; Paul Podsiadlo; Maria K Y Chan; Arnaud Demortiere; David J Gosztola; Vitali B Prakapenka; George C Schatz; Uwe Richard Kortshagen; Richard D Schaller |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-7-3 |
Journal Detail:
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Title: Nano letters Volume: - ISSN: 1530-6992 ISO Abbreviation: - Publication Date: 2012 Jul |
Date Detail:
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Created Date: 2012-7-4 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101088070 Medline TA: Nano Lett Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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