Chemical Origin of Exciton Self-trapping in Cs${}_3$Cu${}_2$X${}_5$ Cesium Copper Halides

Zijin Wu, Shuxia Tao, Geert Brocks

Copper halides Cs3Cu2X5 (X=Cl, Br, I) are promising materials for optoelectronic applications due to their high photoluminescence efficiency, stability, and large Stokes shifts. In…