Fig. 5. (a) Normalized UV-vis absorption (left) and fluorescence (right) spectra of DPA6 (blue), DPA8 (green) and DPA10 (red) as liquid (dashed line) and crystalline (solid line) at 20 °C. (b) Variable-temperature fluorescence spectra of DPA10 measured at 20 °C steps during cooling from 10 to –110 °C (up) and subsequent heating from –110 to 10 °C (below; inset, maximum emission wavelength at each temperature) at 10 °C min–1.
