Circularly polarized luminescence and persistent luminescence from spin-orbital coupling and spin-phonon coupling effects

This presentation will report our recent studies on circularly polarized luminescence and persistent luminescence enabled by spin-orbital coupling and spin-phonon coupling effects. Our experimental studies of magnetic field effects found that the circularly polarized luminescence are essentially originated from the circularly polarized orbital ordering effects when spin-orbital coupling is combined with nonlinear optical polarizable structures. Furthermore, we found that extremely slow spin-phonon coupling can be realized by combining the un-usual phonon dynamics from dipolar crystalline structures with spin-orbital coupling. Interestingly, the extremely slow spin-phonon coupling can extend the excited state dynamics from traditional time window of nano/micro-seconds to an emerging time window of seconds, leading to persistent delayed fluorescence. Therefore, spin-orbital coupling and spin-phonon coupling function as an important mechanism to generate circularly polarized luminescence persistent luminescence.