PEROVSKITE LIGHTING SYSTEMS

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In one aspect, composite nanoparticles are provided. In some embodiments, a composite nanoparticle comprises a host matrix comprising A4BX6-ZYZ and ABX3-PYP inclusions dispersed within the host matrix of the composite nanoparticle, wherein A is an alkali metal, B is an element selected from the group consisting of transition metals, Group IVA elements and rare earth elements and X and Y are independently selected from Group VIIA elements, 0≤z≤6, and 0≤p<3.