Unusual emission properties of a triphenylene-based organogel systemElectronic supplementary information (ESI) available: Characterization data for 1 and 2. Fig. S1: UV-Vis spectra of 1 and 2. Fig. S2: X-ray powder diffractograms of xerogels 1 and 2. Fig. S3: Transient fluorescence spectra and fluorescence decays of cyclohexane gel 1. See http://www.rsc.org/suppdata/cc/b3/b302415f/