A scintillator material for an ionizing radiation detector comprising a halide perovskite, said perovskite having one of the following formulations: (A).sub.2(A).sub.n-1[M.sub.nX.sub.3n+1] with n a positive integer between 1 and 100, inclusive, or (A)(A).sub.p-1[M.sub.pX.sub.3p+1] with p a positive integer between 1 and 100, inclusive, or (A).sub.2(A).sub.m[M.sub.mX.sub.3m+2], with m a positive integer between 1 and 100, inclusive, or (A).sub.2(A).sub.q-1[M.sub.qX.sub.3q+3], with q a positive integer between 1 and 100, inclusive;
where A and A are organic cations, M is a metal chosen from Pb, Bi, Ge or Sn, X is a halogen or a mixture of halogens chosen from Cl, Br, and I, and wherein said perovskite further comprises at least one scintillation activating element N.