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Neutrino Physics is a mature branch of science with all the three neutrinomixing angles and two mass squared differences determined with high precision.Inspite of several experimental verifications of neutrino oscillations andprecise measurements of two mass squared differences and the three mixingangles, the unitarity of the leptonic mixing matrix is not yet established,leaving room for the presence of small non-unitarity effects. Deriving thebounds on these non-unitarity parameters from existing experimentalconstraints, on cLFV decays such as, $ \mu\rightarrow e\gamma $, $\mu\rightarrow \tau\gamma $, $ \tau\rightarrow e\gamma $, we study theireffects on the generation of baryon asymmetry through leptogenesis and neutrinooscillation probabilities. We consider a model where see-saw is extended by anadditional singlet $ S $ which is very light, but can give rise tonon-unitarity effects without affecting the form on see-saw formula. We do aparameter scan of a minimal see-saw model in a type I see-saw frameworksatisfying the Planck data on baryon to photon ratio of the Universe, whichlies in the interval, $5.8\times 10^ {-10} < Y _{B} < 6.6 \times 10^ {-10}(BBN)$. We predict values of lightest neutrino mass, and Dirac and MajoranaCP-violating phase $ \delta_{CP} $, $ \alpha $ and $ \beta $, for normalhierarchy and inverted hierarchy for one flavor leptogenesis. It is worthmentioning that all these four quantities are unknown yet, and futureexperiments will be measuring them.

Effects Of leptonic non-unitarity on lepton flavor violation, neutrino oscillation, leptogenesis and lightest neutrino mass