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Proceedings Paper

Single-molecule studies of proton transfer in guest-host materials
Author(s): Philip J. Reid; Erin A. Riley; Chelsea Hess; Patrick Whitham
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Paper Abstract

Although the promise of organic materials for a variety of photonic applications has been recognized for some time, the wide-spread use of these materials is limited by photochemical processes that result in irreversible material decomposition. In this talk, the use of single-molecule microscopy to investigate the photochemistry of organic molecules in guest-host systems is described. A new method for analyzing the photoluminescence intermittency (PI) or “blinking” exhibited by single emitters is presented. This method allows for a statistically robust method for analyzing PI data, and for determining if an external perturbation results in a significant modification of the blinking statistcs. This method is applied to the blinking exhibited by CdSe/CdS quantum dots (QDs) in poly(methyl methacrylate) and the rhodamine derivative violamine R (VR) isolated in single crystals of potassium acid phthalate (KAP). For the QDs our analysis demonstrates that the blinking statistics are not power-law distributed. For VR in KAP we find that deuterium substitution significantly alters the PI exhibited by VR consistent with proton-transfer contributing to PI.

Paper Details

Date Published: 27 September 2012
PDF: 10 pages
Proc. SPIE 8459, Physical Chemistry of Interfaces and Nanomaterials XI, 84590E (27 September 2012); doi: 10.1117/12.956787
Show Author Affiliations
Philip J. Reid, Univ. of Washington (United States)
Erin A. Riley, Univ. of Washington (United States)
Chelsea Hess, Univ. of Washington (United States)
Patrick Whitham, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 8459:
Physical Chemistry of Interfaces and Nanomaterials XI
Jenny Clark; Carlos Silva, Editor(s)

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