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All-optical tuning of the Stokes shift in PbS quantum dots

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2 Author(s)
Ullrich, B. ; Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos C.P. 62210, Mexico ; Wang, J. S.

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The Stokes shift of colloidal 4.7 nm PbS quantum dots was measured between 5 and 300 K at incrementally increasing continuous laser intensities. The results demonstrate Stokes shift tuning by optical means only at stable given temperatures due to optically enforced electronic state alteration in the quantum dots. The tuning phenomenon is perfectly fit by a semi-empirical model, which provides a design tool for the chromaticity of quantum dots at different optical pump intensities.

Published in:

Applied Physics Letters  (Volume:102 ,  Issue: 7 )