New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses
The power dependence of the transient absorption spectrum of CdSe nanoparticle colloids with size distribution of 4.0 ± 0.4 nm diameter is studied with femtosecond pump−probe techniques. At the lowest pump laser power, the absorption bleaching (negative spectrum) characteristic of the exciton spectr...
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Veröffentlicht in: | Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical Surfaces, Interfaces, amp Biophysical, 1999-12, Vol.103 (49), p.10775-10780 |
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container_title | Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical |
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creator | Burda, C Link, S Green, T. C El-Sayed, M. A |
description | The power dependence of the transient absorption spectrum of CdSe nanoparticle colloids with size distribution of 4.0 ± 0.4 nm diameter is studied with femtosecond pump−probe techniques. At the lowest pump laser power, the absorption bleaching (negative spectrum) characteristic of the exciton spectrum is observed with maxima at 560 and 480 nm. As the pump laser power increases, two new transient absorptions at 510 and 590 nm with unresolved fast rise ( |
doi_str_mv | 10.1021/jp991503y |
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C ; El-Sayed, M. A</creator><creatorcontrib>Burda, C ; Link, S ; Green, T. C ; El-Sayed, M. A ; Georgia Inst. of Tech., Atlanta, GA (US)</creatorcontrib><description>The power dependence of the transient absorption spectrum of CdSe nanoparticle colloids with size distribution of 4.0 ± 0.4 nm diameter is studied with femtosecond pump−probe techniques. At the lowest pump laser power, the absorption bleaching (negative spectrum) characteristic of the exciton spectrum is observed with maxima at 560 and 480 nm. As the pump laser power increases, two new transient absorptions at 510 and 590 nm with unresolved fast rise (<100 fs) and long decay times (≫150 ps) are observed. The energy of each of the positive absorption is red shifted from that of the bleach bands by ∼120 meV. The origin of this shift is discussed in terms of the effect of the internal electric field of the many electron−hole pairs formed within the quantum dot at the high pump intensity, absorption from a metastable excited state or the formation of biexcitons.</description><identifier>ISSN: 1520-6106</identifier><identifier>ISSN: 1089-5647</identifier><identifier>EISSN: 1520-5207</identifier><identifier>DOI: 10.1021/jp991503y</identifier><language>eng</language><publisher>United States: American Chemical Society</publisher><subject>ABSORPTION SPECTROSCOPY ; CADMIUM SELENIDE SOLAR CELLS ; CADMIUM SELENIDES ; COLLOIDS ; MATERIALS SCIENCE ; OPTICAL PROPERTIES ; SEMICONDUCTOR MATERIALS ; SOLAR ENERGY</subject><ispartof>Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, 1999-12, Vol.103 (49), p.10775-10780</ispartof><rights>Copyright © 1999 American Chemical Society</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a323t-1f49832f144f6231dbfb465021213f18f94a0277f28760936e86a6022ef1350a3</citedby><cites>FETCH-LOGICAL-a323t-1f49832f144f6231dbfb465021213f18f94a0277f28760936e86a6022ef1350a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/jp991503y$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/jp991503y$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,780,784,885,2765,27076,27924,27925,56738,56788</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/20013083$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Burda, C</creatorcontrib><creatorcontrib>Link, S</creatorcontrib><creatorcontrib>Green, T. C</creatorcontrib><creatorcontrib>El-Sayed, M. A</creatorcontrib><creatorcontrib>Georgia Inst. of Tech., Atlanta, GA (US)</creatorcontrib><title>New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses</title><title>Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical</title><addtitle>J. Phys. Chem. B</addtitle><description>The power dependence of the transient absorption spectrum of CdSe nanoparticle colloids with size distribution of 4.0 ± 0.4 nm diameter is studied with femtosecond pump−probe techniques. At the lowest pump laser power, the absorption bleaching (negative spectrum) characteristic of the exciton spectrum is observed with maxima at 560 and 480 nm. As the pump laser power increases, two new transient absorptions at 510 and 590 nm with unresolved fast rise (<100 fs) and long decay times (≫150 ps) are observed. The energy of each of the positive absorption is red shifted from that of the bleach bands by ∼120 meV. The origin of this shift is discussed in terms of the effect of the internal electric field of the many electron−hole pairs formed within the quantum dot at the high pump intensity, absorption from a metastable excited state or the formation of biexcitons.</description><subject>ABSORPTION SPECTROSCOPY</subject><subject>CADMIUM SELENIDE SOLAR CELLS</subject><subject>CADMIUM SELENIDES</subject><subject>COLLOIDS</subject><subject>MATERIALS SCIENCE</subject><subject>OPTICAL PROPERTIES</subject><subject>SEMICONDUCTOR MATERIALS</subject><subject>SOLAR ENERGY</subject><issn>1520-6106</issn><issn>1089-5647</issn><issn>1520-5207</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNptkE9PAjEQxTdGExE9-A2aGA8eVvtnt7t7JETEBIEEjN6asjuV4rLdtEUkfnlrIJw8TOYdfvMy70XRNcH3BFPysGqLgqSY7U6iDkkpjsNkpwfNCebn0YVzK4xpSnPeiX7GsEVzKxunofGot3DGtl6bBk0WDuwXVEg3yC8BzVoovd2skVGob-ra6ErWqF_NAI1lY1ppvS5rcGi6WbfhbKv9Eg31xzKemi1YNIC1Nw5K01QBqR24y-hMySCuDrsbvQ4e5_1hPJo8Pfd7o1gyynxMVFLkjCqSJIpTRqqFWiQ8DWkpYYrkqkgkplmmaJ5xXDAOOZccUwqKsBRL1o1u9r7GeS1cqT2Uy_BHEwIJijFhOGeButtTpTXOWVCitXot7U4QLP66FcduAxvvWe08fB9BaT8Fz1iWivl0JrLk7X3GXjIxCvztnpelEyuzsU3I-4_vL2auhvs</recordid><startdate>19991209</startdate><enddate>19991209</enddate><creator>Burda, C</creator><creator>Link, S</creator><creator>Green, T. 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A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a323t-1f49832f144f6231dbfb465021213f18f94a0277f28760936e86a6022ef1350a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>ABSORPTION SPECTROSCOPY</topic><topic>CADMIUM SELENIDE SOLAR CELLS</topic><topic>CADMIUM SELENIDES</topic><topic>COLLOIDS</topic><topic>MATERIALS SCIENCE</topic><topic>OPTICAL PROPERTIES</topic><topic>SEMICONDUCTOR MATERIALS</topic><topic>SOLAR ENERGY</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Burda, C</creatorcontrib><creatorcontrib>Link, S</creatorcontrib><creatorcontrib>Green, T. C</creatorcontrib><creatorcontrib>El-Sayed, M. A</creatorcontrib><creatorcontrib>Georgia Inst. of Tech., Atlanta, GA (US)</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Burda, C</au><au>Link, S</au><au>Green, T. C</au><au>El-Sayed, M. A</au><aucorp>Georgia Inst. of Tech., Atlanta, GA (US)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses</atitle><jtitle>Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical</jtitle><addtitle>J. Phys. Chem. B</addtitle><date>1999-12-09</date><risdate>1999</risdate><volume>103</volume><issue>49</issue><spage>10775</spage><epage>10780</epage><pages>10775-10780</pages><issn>1520-6106</issn><issn>1089-5647</issn><eissn>1520-5207</eissn><abstract>The power dependence of the transient absorption spectrum of CdSe nanoparticle colloids with size distribution of 4.0 ± 0.4 nm diameter is studied with femtosecond pump−probe techniques. At the lowest pump laser power, the absorption bleaching (negative spectrum) characteristic of the exciton spectrum is observed with maxima at 560 and 480 nm. As the pump laser power increases, two new transient absorptions at 510 and 590 nm with unresolved fast rise (<100 fs) and long decay times (≫150 ps) are observed. The energy of each of the positive absorption is red shifted from that of the bleach bands by ∼120 meV. The origin of this shift is discussed in terms of the effect of the internal electric field of the many electron−hole pairs formed within the quantum dot at the high pump intensity, absorption from a metastable excited state or the formation of biexcitons.</abstract><cop>United States</cop><pub>American Chemical Society</pub><doi>10.1021/jp991503y</doi><tpages>6</tpages></addata></record> |
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source | American Chemical Society |
subjects | ABSORPTION SPECTROSCOPY CADMIUM SELENIDE SOLAR CELLS CADMIUM SELENIDES COLLOIDS MATERIALS SCIENCE OPTICAL PROPERTIES SEMICONDUCTOR MATERIALS SOLAR ENERGY |
title | New Transient Absorption Observed in the Spectrum of Colloidal CdSe Nanoparticles Pumped with High-Power Femtosecond Pulses |
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