Inorganic lead halide perovskites (APbX3) are promising candidates for optoelectronics and solar cell applications. Ultrahigh luminescence quantum yield (∼100%), large absorption coefficients, low non-radiative recombination rates and tunable spectral emissions from the ultraviolet to the visible range make these perovskites apt candidate for light emitting diodes and solar cells. In this talk, I will provide a detailed literature survey of these inorganic halide perovskites and summarize the studies planned for my research. I will discuss specifically the studies performed to tailor the bandgap tunability and stability aspects of these APbX3 (A= Rb, Cs and X= Br, I) perovskite quantum dots (PQDs). The effect of cationic and anionic substitution on absorbance and emission spectra of PQDs will be highlighted. We explore the confinement of light emitted by the PQDs inside a symmetrical microcavity due to total internal reflection leading to intense whispering gallery modes (WGM).This is demonstrated for the first time in CsPbI3-QDs coated on TiO2 spherical microcavities. The photoluminescence emission from a CsPbI3-QDs gain medium strongly couples with a TiO2 microspherical resonating optical cavity. Laser power dependent emission studies show the spontaneous emission from these microcavities switches to a stimulated emission above a distinct threshold point of 708.7 W/cm2. Quality factors as high as Q∼1195 for WGM microlasing is demonstrated at room temperature. CsPbI3-QDs/TiO2 microcavities are also found to be photostable even after continuous laser excitation for 75 minutes. The CsPbI3-QDs/TiO2 microspheres are promising as WGM-based tunable microlasers. Further studies planned to exploit this property to realize effective WGM lasing and whisperonic solar cells will be presented.​