Re-charging the luminescence states in CdSe/ZnS quantum dots at the conjugation to Osteopontin antibodies

► Bioconjugation of QDs to Osteopontin antibodies includes covalent and electrostatic interactions. ► PL spectra of bioconjugated QDs have been transformed by electric charges of dipoles. ► The electric field is created by the electric dipoles of Osteopontin antibodies. ► Raman study has confirmed that osteopontin antibodies have the electrical dipoles.