Fig. 5: Description of color-tunable UOP for multilevel information encryption.
From: Color-tunable ultralong organic room temperature phosphorescence from a multicomponent copolymer
a Process of information encryption by using the multi-component copolymer PDNA (NTU) and PDA (RP) as encryption ink under ambient conditions. b Long-lived luminescence photographs of letters (RNTUP and NTU) before and after switching off the UV light of 254 and 365 nm, respectively.
