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The abundant chemical tunability along with outstanding optoelectronic properties of the 2D metal-halide layered perovskite materials, as well as the potential prospect on understanding the structure-property relationships at the molecular level, provide enormous opportunity for the scientific community on designing new and efficient 2D metal-halide layered perovskites for a specific optoelectronic application. These materials still require attention on understanding their fundamental electronic properties and on controlling their synthesis parameters to produce high quality materials. Moreover, the synergy between the organic and inorganic compounds in these systems further opens up the possibility to unlock novel optoelectronic properties by simply integrating many other available functional organic molecules into these structures. This thesis is dedicated to the synthesis of 2D lead-bromide Ruddlesden Popper layered perovskite materials through a simple synthesis technique and by using different organic molecules. It targets a full investigation of the photo-physical properties of the as synthesized materials. Moreover, it presents detailed studies on the effect of structural rigidity and electron-phonon interaction provided by organic molecules on the emission efficiencies of 2D layered perovskites, and their emission tunability by using organic molecules with different architectures. In a more technological view, this thesis summarizes the work performed on the integration of 2D layered perovskites in polymer films and their emission enhancement by mechanical stress.