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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 6 — Mar. 17, 2008
  • pp: 3515–3526

Onion-like (CdSe)ZnS/CdSe/ZnS quantum-dot-quantum-well heteronanocrystals for investigation of multi-color emission

Sedat Nizamoglu and Hilmi Volkan Demir  »View Author Affiliations


Optics Express, Vol. 16, Issue 6, pp. 3515-3526 (2008)
http://dx.doi.org/10.1364/OE.16.003515


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Abstract

We investigate multi-color spontaneous emission from quantum-dot-quantum-well heteronanocrystals made of onion-like (CdSe)ZnS/CdSe/ZnS (core)shell/shell/shell structures, with our theoretical results explaining experimental measurements for the first time. In such multi-layered heteronanocrystals, we discover that the carrier localization is tuned from type-1-like to type-2-like localization by controlling CdSe and ZnS shell thicknesses, and that 3-monolayer ZnS barriers are not necessarily sufficient for carrier localization, unlike in conventional (CdSe)ZnS (core)shell structures. We demonstrate that exciton localization in distinct layers of (CdSe)ZnS/CdSe/ZnS heteronanocrystals with high transition probability (for n=1 states in CdSe core and n=2 states in CdSe shell) is key to their multi-color emission.

© 2008 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(250.0250) Optoelectronics : Optoelectronics
(260.3800) Physical optics : Luminescence

ToC Category:
Optoelectronics

History
Original Manuscript: January 30, 2008
Revised Manuscript: February 27, 2008
Manuscript Accepted: February 28, 2008
Published: March 3, 2008

Citation
Sedat Nizamoglu and Hilmi Volkan Demir, "Onion-like (CdSe)ZnS/CdSe/ZnS quantum-dot-quantum-well heteronanocrystals for investigation of multi-color emission," Opt. Express 16, 3515-3526 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-6-3515


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