In summary, The FBNF is found to be a structurally, mechanically, and dynamically stable monolayer. The sp 3 hybridized B-N in FBNF, is longer than in h-BN is involved in buckling to soften the structure by retaining the structural and elastic isotropy. The F-5 orbital plays a role to create the insulator-semiconductor electronic transition. The visible range PBE-bandgap supports the largest optical absorption, low electron energy loss, and good reflectivity. In addition, the strong optical anisotropy enriches the optical quality and establishes this material as a proper candidate in optoelectronic devices. These outstanding findings are also supported by the experimental evidence . Hence, the FBNF monolayer is a potential candidate for nanomechanical and optoelectronic device applications.