Two new inorganic-organic hybrid manganese(II) halide crystals, namely [BMMIm]₂[MnCl₄] (1, BMMIm = 1-butyl-2,3-dimethylimidazolium) and [BMMIm]₂[MnBr₄] (2), have been obtained simply by heating/stirring with nearly 100% yield. Single-crystal X-ray diffraction (SCXRD) study reveals that 1 crystallizes in triclinic space group of P with a = 10.0176(7), b = 14.9603(11), c = 12.9086(8) Å, a = 91.060(4)°, β = 110.204(5)°, g = 92.361(4)°, V = 1235.19(12) ų, Z = 2, D_c = 1.353 g·cm^-3, F(000) = 526, μ = 0.978 mm^-1, R = 0.0410 and wR = 0.0690 (I > 2σ(I)) and M_r = 503.23; 2 belongs to orthorhombic space group of P2₁2₁2₁ with a = 10.0176(7), b = 14.9603(11), c = 17.4450(14) Å, V = 2614.4(3) ų, Z = 4, D_c = 1.730 g·cm^-3, F(000) = 1340, μ = 6.629 mm^-1, R = 0.0440 and wR = 0.0520 (I > 2σ(I)) and M_r = 681.07. The ionic compounds 1 and 2 are composed of mononuclear tetrahedral [MnX₄]^2- anion and two ionic liquid cations of [BMMIm]⁺. The photoluminescence (PL) of 1 and 2 was characterized and the influence of halogen atom types on PL was investigated.