01323nas a2200145   4500008004100000245013200041210006900173260000800242300001400250490000600264520072600270100002100996700002901017856013101046       2016                        eng d00aCH3NH3Pb(BF4)(3) and (C4H9NH3)2Pb(BF4)(4) family of 3D and 2D perovskites without and with iodide and bromide ions substitution0 aCH3NH3PbBF43 and C4H9NH32PbBF44 family of 3D and 2D perovskites   cNOV  a4757-47620 v73 aWe report the synthesis of fully molecular ion (BF4 )-based organicinorganic hybrid perovskite CH3NH3Pb(BF4)(3), which is a wide band gap semiconductor, and the same can be easily tuned toward the visible by the incorporation of bromide or iodide ions in the crystal framework simply by changing lead precursors. We have also successfully transformed the distorted 3D molecular-ion-induced perovskite to 2D (C4H9NH3)(2)Pb(BF4)(4), (C4H9NH3)(2)PbBr(4x)(BF4)(x), and (C4H9NH3)(2)PbI(4x)(BF4)(x) perovskites that exhibit the optical absorption over the UV to visible region. The thin films of molecular-ion-containing 2D perovskites with Br and I anions show blue and green luminescence, respectively, under UV illumination.1 aNagane, Satyawan1 aOgale, Satishchandra, B.  uhttps://library.ncl.res.in/content/ch3nh3pbbf43-and-c4h9nh32pbbf44-family-3d-and-2d-perovskites-without-and-iodide-and-bromide