Nature Chemistry 1, 80ā€“86 (2009); published online 8 March 2009; corrected after print 16 and 27 March 2009.

In the version of this Article originally published, in paragraph six of the main text, the concentration of reagents in the fibre after evaporation of the solvent was incorrectly given as 0.5 mol lāˆ’1, this should have read 0.5 mmol lāˆ’1. The structure given for rhodamine 6G (compound 5) in Fig. 3a was missing two methyl groups, and should have appeared as shown here. Both these errors have been corrected in the HTML and PDF versions of the Article.