  21-cm radio signal has emerged as an important probe in investigating the
dark age of the Universe (recombination to reionization). In the current
analysis, we explore the combined effects of primordial black holes (PBH),
cooling off of the baryonic matter due to dark matter (DM) - baryon collisions
and interaction of dark matter - dark energy (DE) fluid on the 21-cm brightness
temperature. The variation of brightness temperature shows remarkable
dependence on DM mass ($m_{\chi}$) and the dark matter - baryon scattering
cross-section ($\sigma_0$). Bounds in $m_{\chi}$ - $\sigma_0$ parameter space
are obtained for different possible PBH masses and for different interacting
dark energy (IDE) models. These bounds are estimated based on the observed
excess ($-500^{+200}_{-500}$ mK) of 21-cm brightness temperature by EDGES
experiment. Eventually, bounds on PBH mass is also obtained for different
values of dark matter mass and for different IDE model coupling parameters. The
compatibility of the constraints of the IDE models, in the estimated bounds are
also addressed.
