Materials with perovskite lattices have caught the attention of a large community of researchers worldwide. Despite the relative simplicity of its crystal structure, ABX3, the perovskite lattice. Currently, metal halide perovskites with the same crystal structure as that of ABX3, have become limelight in the field of optoelectronics and photonics. In this context, all inorganic CsPbX3 (with X = Cl, Br, I) perovskite nanocrystals (PNCs) have recently emerged as an outstanding material with remarkable optical properties. Additionally, two-dimensional (2D) van der Waals nanomaterials have attracted considerable attention for potential use in photonic and optoelectronic applications in the nanoscale. The crystal lattice in 2D perovskites is composed of an inorganic octahedral layer sandwiched by long organic cations. Lead and other hazardous heavy metals, on the other hand, are common in perovskites. As a result, lead-free perovskites were developed as a low-cost, non-toxic, earth-abundant material for the next generation of optoelectronic applications. The goal of this Ph.D. thesis is to fully reveal the significance of perovskite materials as an active material for quantum photonics, from both a fundamental and an application standpoint. For the first research objective within that goal, all physical mechanisms responsible for spontaneous emission in PNCs must be investigated. Determining the decay time of these single NCs are all important steps toward this objective. Once the optimal conditions for PNCs are established, they can be used as quantum light sources, with the quality of the light being evaluated using a second order photon correlation function. The next landmark will be to investigate 2D perovskite, a type of 2D van der Waals nanomaterial, for its potential use in photonic and optoelectronic applications at the nanoscale. Optimizing the conditions for mechanical exfoliation of bulk crystals of two different phases of 2D perovskites with the lowest quantum well thickness of n=1,2 to achieve sufficiently thin 2D is an important step toward achieving this goal. The final objective is focused on the incorporation of perovskite materials in an open access fiber-based microcavity. The cavity specific geometry provides strong optical confinement of the modes. The open style of the fiber cavity allows for independent movement of the fiber mirror, allowing for in-situ tuning of the cavity resonance, and typically over a wider spectral range, which this tuning is not possible in monolithic microcavity. As a result, controlling the various parts of this cavity setup, as well as properly understanding the possible light-matter interactions and Light mode coupling based on numerical models, is a significant step toward achieving this objective. Considering the above-written results, this Ph.D. thesis suggests that perovskite materials are promising candidates for opening the way for a new generation of quantum light sources and their applications.Materials with perovskite lattices have caught the attention of a large community of researchers worldwide. Despite the relative simplicity of its crystal structure, ABX3, the perovskite lattice. Currently, metal halide perovskites with the same crystal structure as that of ABX3, have become limelight in the field of optoelectronics and photonics. In this context, all inorganic CsPbX3 (with X = Cl, Br, I) perovskite nanocrystals (PNCs) have recently emerged as an outstanding material with remarkable optical properties. Additionally, two-dimensional (2D) van der Waals nanomaterials have attracted considerable attention for potential use in photonic and optoelectronic applications in the nanoscale. The crystal lattice in 2D perovskites is composed of an inorganic octahedral layer sandwiched by long organic cations. Lead and other hazardous heavy metals, on the other hand, are common in perovskites. As a result, lead-free perovskites were developed as a low-cost, non-toxic, earth-abundant material for the next generation of optoelectronic applications. The goal of this Ph.D. thesis is to fully reveal the significance of perovskite materials as an active material for quantum photonics, from both a fundamental and an application standpoint. For the first research objective within that goal, all physical mechanisms responsible for spontaneous emission in PNCs must be investigated. Determining the decay time of these single NCs are all important steps toward this objective. Once the optimal conditions for PNCs are established, they can be used as quantum light sources, with the quality of the light being evaluated using a second order photon correlation function. The next landmark will be to investigate 2D perovskite, a type of 2D van der Waals nanomaterial, for its potential use in photonic and optoelectronic applications at the nanoscale. Optimizing the conditions for mechanical exfoliation of bulk crystals of two different phases of 2D perovskites with the lowest quantum well thickness of n=1,2 to achieve sufficiently thin 2D is an important step toward achieving this goal. The final objective is focused on the incorporation of perovskite materials in an open access fiber-based microcavity. The cavity specific geometry provides strong optical confinement of the modes. The open style of the fiber cavity allows for independent movement of the fiber mirror, allowing for in-situ tuning of the cavity resonance, and typically over a wider spectral range, which this tuning is not possible in monolithic microcavity. As a result, controlling the various parts of this cavity setup, as well as properly understanding the possible light-matter interactions and Light mode coupling based on numerical models, is a significant step toward achieving this objective. Considering the above-written results, this Ph.D. thesis suggests that perovskite materials are promising candidates for opening the way for a new generation of quantum light sources and their applications.