The 4th International Conference on Matter and Radiation at Extremes (ICMRE 2019)

315 / 2019-01-28 09:52:11

etraphenylethylene Substituted Phenanthro[9,10-d]imidazole for Linear Fluorescent Response of the External Pressure upto 10.1 GPa

phenanthrene[9,10-d]imidazole · piezochromic sensitivity · quantum efficiency · tetraphenylethylene

Plenary track > High Pressure Physics and Materials Science

Two piezochromic materials containing phenanthro[9,10-d]imidazole and tetraphenylethylene (M1 and M2) were developed. A supra-amplification piezochromic effect originating from their various long-to-short axis ratios was discovered in high-pressure experiments. They could give observable changes of fluorescent signals in the pressure range of 0.0-10.1 GPa, and present one-dimensional linear relationship between the applied pressure and the maximum emission peak wavelength. However, due to the one more phenyl ring in the centre of the molecule, M2 displayed higher piezochromic contrast (102 nm) and better sensitivity (11.19 nm GPa-1) than M1 (69 nm and 6.12 nm GPa-1), which helps to develop a more comprehensive general strategy to evaluate. The ADXRD patterns with high intensity synchrotron radiation has proved that these intriguing materials could maintain the original molecular structure under a high pressure of 10.1 GPa, which is a crucial factor for the application as a high-pressure sensor.[1]