Fig. 5
From: Metal Halide Perovskite for next-generation optoelectronics: progresses and prospects
a Optical band gap of Pb and Sn-based perovskites as a function of Cs content. b Optical band gap of mixed perovskites as a function of Sn content, corresponding to different fractions of Cs. c Two-dimensional band gap map of MHPs with the substitution of A-site and B-site [69]. d Composition-dependent PL spectra of different MHPs with X-site anion variation. e Photographs of CsPbX3 QDs showing anion-based PL tunability [71]