Correction to: Nature Communications https://doi.org/10.1038/s41467-017-01339-0, published online 30 October 2017.

The original version of this Article contained two errors in Fig. 2h, in which the photoluminescence spectra curve of the “PVK:OXD-7” was plotted incorrectly and the figure legends were incorrectly given. The correct version is:

which replaces the previous incorrect version:

This has now been corrected in both the PDF and HTML versions of the Article.