Cerium doped lutetium scandium orthoborate is a novel and promising inorganic scintillator. For the sake of better understanding its scintillation mechanism, several approaches were undertaken to locate the energy levels relative to the host. To estimate the energy position of levels with respect to the valence band, X-ray photoelectron spectroscopy (XPS) was used. Furthermore, the photoluminescence decays as a function of temperature, a widely used technique, was utilized to find the relative positions of levels to the conduction band. Finally, the energy levels in host was constructed, meanwhile, the effectiveness of the XPS technique to estimate the energy position of 4f levels relative to the conduction band was evaluated.