  We construct a scotogenic neutrino mass model introducing large $SU(2)_L$
multiplet fields without adding an extra symmetry. We have introduced extra
scalar fields such as a septet, quintet and quartet where we make the vacuum
expectation value of quartet scalar to be zero while septet and quintet develop
non-zero ones. Then the neutrino mass is generated at one-loop level by
introducing quintet fermion. We analyze the neutrino mass matrix taking
constraints from lepton flavor violation into account and discuss collider
physics regarding charged fermions from large multiplet fields. We have
analysed the production and the decays of the quintet fermions, as well as the
discovery reach at 14 TeV and 27 TeV LHC.
