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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 1 — Jan. 1, 2013
  • pp: 105–109

Photoluminescence from quasi-type-II spherical CdSe-CdS core-shell quantum dots

Lin Dong, Abhilash Sugunan, Jun Hu, Sicheng Zhou, Shanghua Li, Sergei Popov, Muhammet S. Toprak, Ari T. Friberg, and Mamoun Muhammed  »View Author Affiliations

Applied Optics, Vol. 52, Issue 1, pp. 105-109 (2013)

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Spherical CdSe-CdS core-shell quantum dots (QDs) are found to be flexible in the transition between the type-I regime and the type-II regime with different core/shell dimensions. The quasi-type-II feature of the colloidal dots is confirmed with time-resolved photoluminescence (PL) measurements. Two recombination paths of the excitons with significantly different decay rates are observed and analyzed. The spherical CdSe-CdS core-shell QDs are numerically simulated to investigate the carrier separation. A relatively long radiative lifetime and high degree of spatial carrier separation provide good potential to achieve lasing under continuous-wave excitation. Amplified spontaneous emission at room temperature is detected from the QDs embedded in the polymer matrix. It is shown that a larger shell thickness results in a lower pumping threshold, while a smaller shell thickness leads to higher PL efficiency.

© 2012 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(160.3380) Materials : Laser materials
(320.7100) Ultrafast optics : Ultrafast measurements

ToC Category:

Original Manuscript: October 4, 2012
Revised Manuscript: November 29, 2012
Manuscript Accepted: November 30, 2012
Published: December 21, 2012

Lin Dong, Abhilash Sugunan, Jun Hu, Sicheng Zhou, Shanghua Li, Sergei Popov, Muhammet S. Toprak, Ari T. Friberg, and Mamoun Muhammed, "Photoluminescence from quasi-type-II spherical CdSe-CdS core-shell quantum dots," Appl. Opt. 52, 105-109 (2013)

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