“…Perovskite-structured materials have gained importance in many state-of-the-art research fields such as nanocatalysis [1][2][3][4], superconductors [5][6][7][8] or piezoelectrics [9][10][11]; and just recently, the all-inorganic cesium-based lead halide perovskites (CsPbX 3 ; X=Cl, Br, I) have surged as colloidal materials for optoelectronics [12][13][14][15][16][17][18][19]. Due to their high photoluminescence quantum yields (PLQY) [16,19], tunable emission spectra [16,18], facile synthesis methods [17,20] and flexible ionic nature [16,20], these have been used as components in light emitting diodes (LED) [21,22], solar cells [23,24], lasers [25,26], and photodetectors [27,28]; hence, potentially competing with other semiconductor quantum dot (QD) systems [29][30][31].…”