Abstract
It is of great significance to construct organic circularly polarized luminescence systems (CPL) with large luminescence dissymmetry factors (glum) for practical applications. Here we report organic CPL systems constructed by merging triplet-triplet annihilation upconversion chromophores in cellulose matrices. The chirality of the matrix is transferred to the achiral chromophores of photon upconversion and then the multistep energy transfer processes of upconversion amplify glum. The glum value of upconversion CPL in the left-handed ethyl cellulose and the right-handed (acetyl) ethyl cellulose are up to +0.1 and −0.15, respectively. The study provides a straightforward approach for constructing solid organic upconversion CPL materials with large glum, which may expand the application potentials of organic chiroptical materials.
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