Fig. 3: Characterization of MAPbBr3 and MAPbBrxI3-x perovskite NC-embedded Fl–Ph MOFs.
From: Dual-light emitting 3D encryption with printable fluorescent-phosphorescent metal-organic frameworks
a Photographs of the Fl–Ph MOF under daylight, UV light (254 nm), and after turning off the UV lamp (scale bars: 1 cm). b SEM image of the Fl–Ph MOF. c SEM–EDX elemental mapping images of the Ph MOF and Fl–Ph MOF (Pb and Br mapping). d HR-TEM images and FFT pattern from HR-TEM image of Fl–Ph MOF. e XRD patterns of the Ph MOF, MAPbBr3 (bulk), and Fl–Ph MOF. f PL spectra of the Fl–Ph MOF under 254 nm excitation. g Reversible PL and RT-OP switching test with the Fl–Ph MOF (scale bars: 5 mm). h Proposed mechanism of the dual light emission of the Fl–Ph MOF using relative frontier orbital energies. i Photographs of the red fluorescent Fl–Ph MOF with iodide containing perovskite (MAPbBrxI3-x) NCs under daylight, UV light (254 nm), and after turning off the UV lamp
