Pressure Effects on Emissive Materials

Pressure-Induced Change of d-d Luminescence Energies, Vibronic Structure, and Band Intensities in Transition Metal Complexes

“…[1][2][3] A wide variety of solid-state physical properties for many different materials have been reported, as described in a number of extensive reviews with detailed bibliographies covering applications in chemistry, materials science and physics, as well as the experimental methodology, in particular for spectroscopic measurements. [2][3][4][5][6][7][8] Transition metal complexes are particularly attractive for the study of pressure effects, due to their high symmetry structures with many possibilities for subtle variations induced by relatively modest pressures and their electronic structure with degenerate and nondegenerate electronic states. Luminescence and absorption spectra of many transition metal compounds, including organometallic molecules, have been measured and pressure-induced variations have been reported for the energies of their band maxima.…”

“…[13] Pressure effects on intermolecular distances in luminescent gold(I) cyanides have been reported to lead to significant red shifts due to shorter metal-metal distances. [7,14] A middle-ground between intra-and intermolecular effects of pressure is occupied by exchange-coupled polymetallic complexes [6,15,16] and materials of interest as molecular magnets. [17] Phenomena such as piezochromism, mechanochromism and their characterization through luminescence spectroscopy and other properties such as electrical conductivity measurements have been reviewed recently.…”