  Employing a combination of many-body configuration interaction method
described by extended Hubbard model along with first principle calculations we
predict the emergence of high oscillator strength at near-IR region which
originates from the Davydov type of splitting in doped graphene quantum dots
(GQD). Incorporation of strain in GQD promotes closely spaced bright states
inciting for coherent excitation. Controlling the destructive interference of
the functionalized nano graphene quantum states, the dark states can be tuned
towards red end ensuing the system as a good candidate for photocell whereas
coherent states can be tailored to concentrate the light at very high intensity
resulting an opportunity for photonic device
