With the rapid development of information science, it is urgent that memory devices possessing high security, density, and desirable storage ability should be developed. In this work, a smart duplicate response of stimuli has been developed and a time-gate nanohybrid based on variable valence Eu 2+ /Eu 3+ coencapsulated has been fabricated and acts as active material in the multilevel and multidimensional memory devices. The luminescence lifetime of Eu 3+ in this nanohybrid gave a stimuli response due to which the energy level of the coordinated ligand could be modulated. Furthermore, by a simple sintering procedure, Eu 3+ was partially in situ reduced to Eu 2+ with a short lifetime in the system. And the in situ reduction ensured both Eu 3+ and Eu 2+ ions' uniform distribution in the nanohybrid and simultaneous response upon light excitation of variable valence Eu ions. Interestingly, Eu 3+ revealed a prolonged lifetime because of the presence of an energy-transfer effect of Eu 2+ → Eu 3+ . Such a nanohybrid had abundant luminescent properties, including the short lifetime of Eu 2+ , the energy transfer from the Eu 2+ to Eu 3+ ions, and the stimuli response of the Eu 3+ lifetimes when exposed to acidic or basic vapor, thus giving birth to interesting recording and encryption performance in spatial−temporal dimensions. We believe that this research will point out a new direction for the future development of multilevel and multidimensional optical recording and encryption materials.