Fig. 2: Crystal structure and PL behaviors of XOF@AD.
From: Host-guest strategy for full-visible-spectrum piezochromism in halogen-bonded organic frameworks
a The crystal structure of XOF@AD at ambient conditions. The sky-blue and blue-white spheres represent C and N atoms of the guests, respectively. The purple, orange, blue-violet, and gray spheres represent I, O, N, and C atoms of the host, respectively. PPNO: 4-Phenylpyridine-N-oxide; 1,4-DITFB: 1,4-Diiodotetrafluorobenzene. 3D-XOF: three-dimensional halogen-bonded organic framework. b Normalized PL spectra of XOF@AD during compression. c Optical images of XOF@AD from 1 atm to 22.8 GPa. d The CIE chromaticity diagram of XOF@AD during compression. e Pressure-dependent PL wavelength evolution of XOF@AD during compression, with error bar denoting the standard deviation. f The PL intensity of XOF@AD as a function of pressure. g The piezochromic performance of materials was reported in the literature and this work within the visible range8,13,14,15,32,33,34,35,36,37,38,39,40,41.
