Fig. 3: Asymmetric conformations and photophysical properties of Ph-3CP in solid state.
From: Single-component-based multicolor emissions enabled by symmetry breaking
a Four distinct crystal polymorphs of Ph-3CP obtained from low-polarity toluene/n-hexane (Ph-3CP-Y1), cyclohexane/n-hexane (Ph-3CP-Y2), medium-polarity tetrahydrofuran/n-hexane (Ph-3CP-Y3), and high-polarity chloroform/n-hexane (Ph-3CP-Y4). Inset: corresponding fluorescence photographs, where blue-emission images were captured under 300 nm UV light, and yellow-emission images under 360 nm UV light. b Emission spectra and fluorescence images of Ph-3CP powder at different excitation wavelengths ranging from 290 to 370 nm. c Corresponding CIE chromaticity coordinates of Ph-3CP powder at different excitation wavelengths from 290 to 370 nm. d Fluorescence decay profiles of Ph-3CP powder monitored at emission wavelengths of 395 nm, 470 nm, and 550 nm, respectively, using EPLED-340 as the excitation source. e, f Fluorescence emission spectra of Ph-3CP powder recorded from 347 to 77 K upon excitation at 300 nm and 360 nm, respectively. Insets in e, f show the ratio between the two emission intensities as a function of temperature.
