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Lead halide perovskites (LHPs) are promising photonic materials. They show excellent performance in LEDs and solar cells due to several properties, including long carrier lifetime, long diffusion lengths, high refractive index, and defect tolerance. LHPs microcrystals, as opposed to single- or poly-crystalline LHPs thin films, have shown great potential for LEDs and lasers. Some have realized as high as 20.7% external quantum efficiency in LED devices. LHPs microplates and nanowires are also efficient, narrowband laser sources at room temperature.