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 triplet-triplet annihilation upconversion (TTA-UC) was accomplished with the excitation of a sensitizer at hot-band vibrational energy levels in the ground state. Selective excitation of Pt(ii)tetraphenyltetrabenzoporphyrin (PtTPBP) at 635 nm, 655 nm, 671 nm or even 785 nm (IR) all can induce the emissions of 9,10-bis(phenylethynyl)anthracene (BPEA) with the maximum anti-Stokes shift at 0.86 eV, which significantly increases anti-Stokes shifts and shows potential application in information multiple encryptions.