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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 8 — Apr. 14, 2008
  • pp: 5715–5720

High efficiency and nearly cubic power dependence of below-band-edge photoluminescence in water-soluble, copperdoped ZnSe/ZnS Quantum dots

Guichuan Xing, Wei Ji, Yuangang Zheng, and Jackie Y. Ying  »View Author Affiliations

Optics Express, Vol. 16, Issue 8, pp. 5715-5720 (2008)

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Three-photon absorption (3PA) and three-photon-excited photoluminescence (3PE-PL) of ZnSe/ZnS and copper-doped ZnSe/ZnS core-shell quantum dots (QDs) in aqueous solutions have been unambiguously determined by Z-scan and 3PE-PL measurements with 200- fs laser pulses at 1000 nm. The 3PA cross-section is as high as 3.5 × 10-77 cm6 s2 photon-2 for 4.1 nm-sized, copper-doped ZnSe/ZnS QDs, while their below-band-edge PL is found to be nearly cubic dependent on the excitation intensity, with efficiency enhanced by ~ 20 fold compared to the undoped ZnSe/ZnS QDs.

© 2008 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.5970) Nonlinear optics : Semiconductor nonlinear optics including MQW

ToC Category:
Nonlinear Optics

Original Manuscript: February 19, 2008
Revised Manuscript: March 28, 2008
Manuscript Accepted: April 5, 2008
Published: April 8, 2008

Virtual Issues
Vol. 3, Iss. 5 Virtual Journal for Biomedical Optics

Guichuan Xing, Wei Ji, Yuangang Zheng, and Jackie Y. Ying, "High efficiency and nearly cubic power dependence of below-band-edge photoluminescence in water-soluble, copperdoped ZnSe/ZnS Quantum dots," Opt. Express 16, 5715-5720 (2008)

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