Theoretical study of electronic and nonlinear optical properties of novel graphenylene-based materials with donor-acceptor frameworks

A new functionalized graphenylene-based structure was designed by adsorbing of alkali metals M₃ and superalkali M₃O (M = Li, Na, K) on graphenylene (BPC) surface. The spectral data show that the spectral properties of the M₃O@BPC system are very similar because the two-dimensional material plays a major role in the main transition. However, for M₃@BPC system, the spectral shapes of the three systems show significant changes compared to each other because the different alkali metals play a major role in the main transition process. The calculation results show that the introduction of superalkali does not significantly increase the first polarizability; however, the introduction of alkali metals can obtain considerable nonlinear optical materials. For M₃@BPC system, the first hyperpolarizability increases significantly when heavier alkali metal is introduced into the two-dimensional structure, which is found to be 866,290.9 au for K₃@ BPC. A two-level model and first hyperpolarizability density can explain the large first polarizability of these systems.

Giant enhancement of electronic polarizability and the first hyperpolarizability of fluoride-decorated graphene versus graphyne and graphdiyne: insights from ab initio calculations

An effective strategy based on the adsorption of alkali-metal fluorides on graphene, graphyne, and graphdiyne is presented for exploring the strong electro-optical properties, which are correlated with the TDDFT two-level model.