The elastic constants of rubrene determined by Brillouin scattering and density functional theory

The linear elastic stiffness tensor of the crystalline organic semiconductor, rubrene, is measured using Brillouin light scattering spectroscopy and computed from first-principles van der Waals density functional theory calculations. Results are compared with recent measurements of in-plane reduced elastic constants c¯22, c¯33, and c¯23 determined through anisotropic buckling experiments.