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(C 9 H 19 NH 3 ) 2 PbI 2 Br 2 compound is a new crystal belonging to the large hybrid organic–inorganic perovskites compounds family. Optical properties are investigated by optical absorption UV–visible and photoluminescence (PL) techniques. Bands to band absorption peak at 2.44eV as well as an extremely strong yellow–green photoluminescence emission...
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