High contrast fluorescence switching based on CH3NH3PbBr3 perovskite nanoparticles in photochromic composites.

In this work, we report on the photo-induced fluorescence switching film by using CH 3 NH 3 PbBr 3 perovskite nanoparticle fluorophore and spironaphthoxazine photochromic dye for the first time. Attributed to the effective spectral overlap between absorption of spironaphthoxazine in ring-opened merocyanine form and emission of CH 3 NH 3 PbBr 3 energy transfer-induced fluorescence switching film is demonstrated. In addition, both highly luminescent optical property of CH 3 NH 3 PbBr 3 and efficient photochromic reactivity of spironaphthoxazine, enabled high emission on/off emission contrast (>10.0) and fast emission turn on (4.0 s). Finally, modulation of the switching speed is successfully achieved by introducing the chelating agent into the photochrmic film, which effectively retards the rate of photochromic reaction of spironaphthoxazine. [ABSTRACT FROM AUTHOR]