Spin-orbital coupling effects on light-emitting properties in organic and perovskite materials through orbital and spin polarizations in spontaneous and stimulated emission

Abstract

This presentation will present our recent studies on spin-orbital coupling (SOC) effects of light-emitting properties in organic and perovskite materials. In general, SOC generates two fundamental outcomes: (i) spin flipping in the absence of orbital momentum and (ii) Rashba effects in the existence of orbital momentum. The former and latter play a critical role in controlling light-emitting properties. In organic materials, this presentation will discuss the new mechanism of forming SOC from amorphous charge-transfer states in the absence of heavy-metal complex structures. Essentially, a charge-transfer state simultaneously possesses internally-interacting electrical dipole and spin dipole, providing the fundamental possibility to generate an electric-magnetic coupling phenomenon functioning as an artificially-formed SOC, towards realizing a thermally activated delayed fluorescence (TADF) in organic molecules. In perovskites, this presentation will discuss the orbit-orbit interaction