Luminescence from solids such as crystals and aggregates is of growing academic and industrial interest. In this study, we report decomposition of the unpolarized uorescence spectrum of uniaxially oriented 1,3,5-triphenylbenzene (TPB) microcrystals into four polarized spectra measured with polarizer (V: vertical and H: horizontal) and analyser (V: vertical and H: horizontal), where V and H indicate perpendicular and parallel to the layer of TPB molecules in the crystal, respectively. Resolved spectra were interpreted in terms of the molecular and excimer like (J-and H-dimer) emissions. The origin of the excimer like emissions was discussed in relation to the molecular packing in the crystal. It was shown that polarized crystal uorescence can provide insight into the excitation/emission process in the crystal.Although preliminary, this study demonstrates the potential of polarized uorescence to elucidate the luminescent mechanism.

The synthesis of a chiral tetraarylmethane derivative is reported. The solvent effect on the CD spectra was observed for the solution. This is attributable to a molecular design with three of four aryl groups have the nitrogen atom at the ortho position with respect to the central carbon atom. This unique design was realized when a variety of transition metal ions were added to the solution, showing different patterns of CD spectra. This cover picture is a personified translation of this experimental observation. The cartoon also implies a law of human nature: two pupils reacting differently to one thing. More information can be found in the Full Paper by Kouzou Matsumoto, Tatsuo Nehira et al.

Luminescence from solids such as crystals and aggregates is of growing academic and industrial interest. In this study, we report decomposition of the unpolarized fluorescence spectrum of uniaxially oriented 1,3,5-triphenylbenzene (TPB) microcrystals into four polarized spectra measured with polarizer (V: vertical and H: horizontal) and analyser (V: vertical and H: horizontal), where V and H indicate perpendicular and parallel to the layer of TPB molecules in the crystal, respectively. Resolved spectra were interpreted in terms of the molecular and excimer like (J- and H-dimer) emissions. The origin of the excimer like emissions was discussed in relation to the molecular packing in the crystal. It was shown that polarized crystal fluorescence can provide insight into the excitation/emission process in the crystal. Although preliminary, this study demonstrates the potential of polarized fluorescence to elucidate the luminescent mechanism.