Pressure-induced distinct excitonic properties of 2D perovskites with isomeric organic molecules for spacer cations

The evolution of the structural and photoluminescence (PL) properties of [CH 3 (CH 2 ) 4 NH 3 ] 2 PbI 4 ((PA) 2 PbI 4 ) and [(CH 3 ) 2 CH(CH 2 ) 2 NH 3 ] 2 PbI 4 ((PNA) 2 PbI 4 ) with isomeric organic molecules for spacer cations.