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Originally published in Science Express on 3 May 2001
Science 15 June 2001:
Vol. 292. no. 5524, pp. 2060 - 2063
DOI: 10.1126/science.1060810
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Reports

Linearly Polarized Emission from Colloidal Semiconductor Quantum Rods

Jiangtao Hu,12* Liang-shi Li,12* Weidong Yang,12 Liberato Manna,12 Lin-wang Wang,3 A. Paul Alivisatos12dagger

Colloidal quantum rods of cadmium selenide (CdSe) exhibit linearly polarized emission. Empirical pseudopotential calculations predict that slightly elongated CdSe nanocrystals have polarized emission along the long axis, unlike spherical dots, which emit plane-polarized light. Single-molecule luminescence spectroscopy measurements on CdSe quantum rods with an aspect ratio between 1 and 30 confirm a sharp transition from nonpolarized to purely linearly polarized emission at an aspect ratio of 2. Linearly polarized luminescent chromophores are highly desirable in a variety of applications.

1 Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA.
2 Materials Science Division,
3 National Energy Research Scientific Computing Center, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA.
*   These authors contributed equally to this work.

dagger    To whom correspondence should be addressed.

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