Multiwavelength hot-band excited triplet–triplet annihilation upconversion with Pt(ii)porphyrin complex/9,10-bis(phenylethynyl)anthracene and multiple encryption information applications

Multiwavelength hot-band excited low-powered upconversion was accomplished with the excitation of a sensitizer at hot-band vibrational energy levels in the ground state, and provides a new way of transcending traditional absorption law restriction.