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Excited-states and lightfastness of linear trans-quinacridone pigment nanoparticles

Paper ID Volume ID Publish Year Pages File Format Full-Text
28966 44109 2009 6 PDF Available
Title
Excited-states and lightfastness of linear trans-quinacridone pigment nanoparticles
Abstract

The photoexcited state of linear trans-quinacridone pigment nanoparticles, prepared by a reprecipitation method, was analyzed by time-resolved spectroscopy. The analysis showed that the S1 state of the linear trans-quinacridone nanoparticles undergoes a quantitative, non-radiative relaxation to the ground state with a time constant of about 100 ps. By contrast, the S1 state of the molecular dispersion state (dilute solution state) was relatively long-lived (21 ns). This, together with the intersystem crossing to T1 observed in the molecular dispersion state, clearly distinguished the nanoparticles from the molecular dispersion state. By comparing the two in terms of lightfastness, the nanoparticles were found to be much more lightfast than the molecular dispersion state. It was speculated that the superior lightfastness of the linear trans-quinacridone pigment nanoparticles was not due to the molecular structure but the facilitated S1 relaxation by the aggregation of the molecules.

Keywords
Linear trans-quinacridone; Lightfastness; Organic nanoparticle; Reprecipitation method
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Excited-states and lightfastness of linear trans-quinacridone pigment nanoparticles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 201, Issues 2–3, 25 January 2009, Pages 208–213
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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