“…c) Photoluminescence decay curve of Cs 2 Pb(SCN) 2 Br 2 single crystal measured by time-resolved PL under excitation at 375 nm and detected at 520 nm with a biexponential fitted line. d) Summary chart of exciton binding energy (meV) versus bandgap (eV) for 2D (BA 2 PbI 4 , [12] Cs 2 PbI 2 Cl 2 , [37] BDAPbI 4 , [42] DMPDPbI 4 , [43] PEA 2 PbBr 4 , [20,43] (Decyl-NH 3 ) 2 PbI 4 , [44,45] HA 2 PbBr 4 , [46] and this work Cs 2 Pb(SCN) 2 Br 2 ), quasi-2D (BA 2 MA n−1 Pb n I 3n+1 (n = 2, 3, 4, and 5), [12] PEA 2 MA n−1 Pb n Br 3n+1 (n = 2, 3, 4, and 5), [22] p-FPEA 2 MA n−1 Pb n Br 3n+1 (n = 2, 3, 4, and 5) [22] ), and 3D (MAPbBr 3 , [46] MAPbI 3 , [47] FAPbBr 3 , [47] FAPbI 3 , [47] CsPbCl 3 , [48] CsPbBr 3 , [48] CsPbI 3 , [48] and CsPbI 2 Br [48] ) perovskites. e) UV-vis absorption and PL spectra of Cs 2 Pb(SCN) 2 Br 2 single crystal.…”