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Linearly Polarized Emission from Colloidal Semiconductor Quantum Rods

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Science  15 Jun 2001:
Vol. 292, Issue 5524, pp. 2060-2063
DOI: 10.1126/science.1060810

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Abstract

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.

  • * These authors contributed equally to this work.

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