Fig. 4: Multiple white-light emissive crystals of 4CN.
From: Multiple yet switchable hydrogen-bonded organic frameworks with white-light emission
a Packing diagram of 4CN(Hex) along the [001] direction and [100] direction. The dimensions of the cavity are highlighted by red arrows. b Normalized fluorescent emission spectra of 4CN(Hex), 4CN(Hep), 4CN(Oct), 4CN(Dec) and 4CN(Dod) crystals. Inset: fluorescent images of 1 for 4CN(Hex), 2 for 4CN(Hep), 3 for 4CN(Oct), 4 for 4CN(Dec) and 5 for 4CN(Dod) crystals. c The corresponding CIE chromaticity coordinates in CIE-1931 chromaticity diagram for 1–5. d PL spectra of 4CN(Hex) after grinding. Inset: the PXRD patterns of simulated 4CN(Hex) and its ground sample. e Time-resolved emission spectra of 4CN(Hex) crystal. λex = 343 nm. f Proposed mechanism for white light emitting crystals.
