<jats:title>Abstract</jats:title><jats:p>Luminescent lanthanide complexes containing effective photosensitizers are promising materials for use in displays and sensors. The photosensitizer design strategy has been studied for developing the lanthanide-based luminophores. Herein, we demonstrate a photosensitizer design using dinuclear luminescent lanthanide complex, which exhibits thermally-assisted photosensitized emission. The lanthanide complex comprised Tb(III) ions, six tetramethylheptanedionates, and phosphine oxide bridge containing a phenanthrene frameworks. The phenanthrene ligand and Tb(III) ions are the energy donor (photosensitizer) and acceptor (emission center) parts, respectively. The energy-donating level of the ligand (lowest excited triplet (T<jats:sub>1</jats:sub>) level = 19,850 cm<jats:sup>−1</jats:sup>) is lower than the emitting level of the Tb(III) ion (<jats:sup>5</jats:sup>D<jats:sub>4</jats:sub> level = 20,500 cm<jats:sup>−1</jats:sup>). The long-lived T<jats:sub>1</jats:sub> state of the energy-donating ligands promoted an efficient thermally-assisted photosensitized emission of the Tb(III) acceptor (<jats:sup>5</jats:sup>D<jats:sub>4</jats:sub> level), resulting in a pure-green colored emission with a high photosensitized emission quantum yield (73%).</jats:p>
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