Surface transformation and photoinduced recovery in CdSe nanocrystals

CdSe nanocrystals in solution and films can enter a metastable state in which the highly luminescent nanocrystals become dark. This change, which we attribute to a surface transformation, can be caused by heating or by changing the environment of the nanocrystals at room temperature. The metastable...

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Veröffentlicht in:	Physical review letters 2001-04, Vol.86 (14), p.3132-3135
Hauptverfasser:	Hess, B C, Okhrimenko, I G, Davis, R C, Stevens, B C, Schulzke, Q A, Wright, K C, Bass, C D, Evans, C D, Summers, S L
Format:	Artikel
Sprache:	eng
Online-Zugang:	Volltext
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Zusammenfassung:	CdSe nanocrystals in solution and films can enter a metastable state in which the highly luminescent nanocrystals become dark. This change, which we attribute to a surface transformation, can be caused by heating or by changing the environment of the nanocrystals at room temperature. The metastable transformation is reversed upon illumination of above-band-gap light, at which point the nanocrystals are again highly luminescent.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.86.3132