Synthesis and characterization of new luminescent ferroelectric [(CH3)(C6H5)(3)P](2)MnBr4 organic inorganic hybrid (OIH) are reported. Powder x-ray diffraction showed the following phases: (P2/m (280 K)) Phase (iv) (P21 (298 K)) Phase (Pna21 (350 K)) Phase (II) (Pnma (370 K)) Phase (I). Room temperature lattice parameters are a = 9.6233 (angstrom), b = 12.5653 (angstrom) c = 16.4503 (angstrom) and beta = 105.6 degrees (T = 298 K). UV-VIS and Ac magnetic susceptibility confirm tetrahedral symmetry of [MnBr4](2-). DSC and dielectric measurements showed four phase transitions at T-4peak = 279.1 +/- 1 K (Delta S = 1.03 J/mol K), T-3peak = 300.1 +/- 2 K (Delta S = 2.33 J/mol K), T-2peakt = 353.2 +/- 3 K (Delta S = 2.68 J/mol K) and T-1peak = 379.1 +/- 3 K (Delta S = 2.43 J/mol K). Calculated lattice potential energy values vary from 827 (14/mol) at 280 K to (797 kJ/mol) at 370 K. Ac conductivity measurements (220 < T(K) < 400) and (0.081 < f (kHz) < 30) are presented. It is ferroelectric with Curie temperature T-c = 309 K. Hybrid is semiconductor in the temperature range 309 +/- 14 K, where conductivity follows Jonscher's universal dielectric response otherwise it is an insulator where crossover to super-linear power law prevails. Comparison to the corresponding chloride is discussed. (C) 2016 Elsevier B.V. All rights reserved.