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Optical images of microscale IR-to-visible upconversion device arrays. (A and B) Optical image of fabricated IR-to-red (A) and IR-to-yellow (B) upconversion device arrays under 810-nm IR illumination. (C and D) Photographs of representative images captured with a red (C) emission upconversion device array and a yellow (D) emission upconversion device array under patterned IR illuminations.
