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We demonstrate a passive down-conversion imaging system that convertsbroadband ultraviolet light to narrow-band green light while preserving thedirectionality of rays, and thus enabling direct down-conversion imaging. Atthe same time our system has high transparency in the visible, enablingsuperimposed visible and ultraviolet imaging. The frequency conversion isperformed by a subwavelength-thickness transparent downconverter based onhighly efficient CsPbBr3 nanocrystals incorporated into the focal plane of asimple telescope or relay-lens geometry. The resulting imaging performance ofthis down-conversion system approaches the diffraction limit. Thisdemonstration sets the stage for the incorporation of other high-efficiencyperovskite nanocrystal materials to enable passive multi-frequency conversionimaging systems.

Passive frequency conversion of ultraviolet images into the visible using perovskite nanocrystals