Fig. 6: 3D double encryption with an Fl–Ph MOF-dispersed 3D-printable PCL polymer matrix for smartphone application. | Light: Science & Applications

Fig. 6: 3D double encryption with an Fl–Ph MOF-dispersed 3D-printable PCL polymer matrix for smartphone application.

From: Dual-light emitting 3D encryption with printable fluorescent-phosphorescent metal-organic frameworks

Fig. 6: 3D double encryption with an Fl–Ph MOF-dispersed 3D-printable PCL polymer matrix for smartphone application.

a 3D double encryption of a cube structure with Fl–Ph MOF@PCL filaments. b Operation of the smartphone application for 3D double encryption using a conventional camera. c Process of reading the encrypted information with blue phosphorescence hidden under fluorescence using a smartphone application. d Reading the results of 3D-encrypted information by e using dual-light-emitting cubes under UV (254 nm) light, f using rotated cubes after the UV lamp was turned off, and g using correctly aligned cubes after the UV lamp was turned off for the encryption of “NP” (top: photograph captured by smartphone, middle: binarized image, bottom: password comparison result with scores)

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