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Highly photoluminescent ZnSe/ZnS quantum dots

V V Nikesh and Shailaja Mahamuni

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ZnSe quantum dots have been synthesized using a simple aqueous route. Coating ZnSe quantum dots with a ZnS monolayer, yields a remarkable enhancement in the PL quantum efficiency at room temperature without affecting the spectral distribution. The results suggest that passivation of surface states, along with an increased localization of the hole in core ZnSe layer, gives rise to high luminescence quantum yield.


PACS

78.67.Hc Quantum dots

73.20.At Surface states, band structure, electron density of states

78.55.Et II-VI semiconductors

81.65.Rv Passivation

Subjects

Condensed matter: electrical, magnetic and optical

Semiconductors

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Dates

Issue 8 (August 2001)

Received 14 August 2000, in final form 1 June 2001

Published 4 July 2001



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