Fig. 5. Relative emission spectra for 3-HTC-DiCN in CH₂Cl₂ with different excitation wavelengths. The emission intensities of the spectra are set to be the same at the peak of the normal form emission. Insets: photos of emission hue with a shorter- or a longer-wavelength excitation. Also shown in the inset is the enlargement of the emission in the range of 450–575 nm.