Photoluminescent Patterned Papers Resulting from Printings of Polymeric Nanoparticles Suspension

Pierre Sarrazin,Didier Chaussy,Olivier Stephan,Davide Beneventi,Aurore Denneulin

doi:10.1155/2010/612180

Abstract

The printability of a copolyfluorene-fluorenone (PFFO) photoluminescent nanoparticle aqueous suspension on commercial tracing paper was here investigated. The nanoparticles suspension was obtained by miniemulsification of a suitable preformed photoluminescent organic polymer. The structural, physicochemical, and rheological characteristics of the nanoparticles suspension were first studied before considering its printability by inkjet and flexography techniques. The native properties of the nanoparticles suspension revealed to be more suitable for inkjet printing which was successfully used to print photoluminescent patterns using a very low amount of PFFO.

Highlights

Since the middle of the last century the interest towards photoluminescent inks increased steadily either in the interior and packaging decorations or mostly in the paper security sector [1, 2]
Surface tension measurements taken during the miniemulsification process showed an initial increase in surface tension from 36.8 to 41.6 mN·m−1 followed by a plateau, which reflected the progressive Tetradecyltrimethylammonium bromide (TTAB) adsorption to the surface of freshly formed printability of a copolyfluorene-fluorenone (PFFO)/chloroform droplets (Figure 2(a))
Surface tension remained constant indicating that after 6 minutes ultrasonication TTAB adsorption reached the equilibrium and that free surfactant remains in the aqueous phase with a concentration close to the c.m.c

Summary

Introduction

Since the middle of the last century the interest towards photoluminescent inks increased steadily either in the interior and packaging decorations (e.g., printing paper and cardboard) or mostly in the paper security sector [1, 2]. Inks are composed of chromophores which: (i) are not visible under solar light to provide printed images that can not be photocopied, (ii) are readable only under special environments (e.g., ultraviolet light), (iii) can be thermally erasable for rewriting [3]. In the last decade it was demonstrated that a new material class such as organic semiconductors can be used to achieve luminescence [5] offering new opportunities for light-emitting sources [6] and a multitude of other electronic devices. Conjugated polymer organic solutions were processed by spin- or drop-casting, screen-printing [7,8,9] or inkjet printing [4, 10,11,12,13] for the treatment of several kinds of surfaces

Methods

Results

Conclusion