Fig. 4: Pochoir patterning of the Fl MOF and Fl–Ph MOF powders for 2D information encryption.
From: Dual-light emitting 3D encryption with printable fluorescent-phosphorescent metal-organic frameworks

a Schematic illustration of 2D pochoir patterning with the Fl MOF and Fl–Ph MOF powders. b Original 2D pochoir pattern design, and c photographs of real information with blue phosphorescence (NANOPOLYMER) concealed in fake information with green fluorescence (WAMQRQEYMBB) under UV (254 nm) exposure. d Photographs of 2D pochoir information encryption and decryption with different excitation wavelength