Coupling excitons to polaritons for better solar cells and higher intensity LEDs

https://phys.org/news/2024-08-coupling-excitons-polaritons-solar-cells.html

"controlling exciton-exciton annihilation by coupling excitons with cavity polaritons, varying separation between 2 mirrors that hold trapped photons, enclosing 2D perovskite LED, such as (PEA)2PbI4 (PEPI), or solar cell layer... stronger coupling, from tuning relative amounts of time polaritons spend as photons, produced longer excited state, lowering loss process by order magnitude... unlike excitons, photons do not annihilate each other when meet, but polaritons pass through each other if they happen to be more photonic"