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Cyclometalated Ir(III) complexes with pyrenyl-fused imidazole ligands were prepared. The complexes show strong absorption of visible light and long-lived triplet excited state and were used as triplet photosensitizers for triplet–triplet annihilation (TTA) upconversion. Pyreno[4,5-d]imidazole C^N ligand was used to access the long-lived T 1 excited state (Ir-1, bpy = 2,2′-bipyridine as the...
C^N*N cyclometalated platinum(II)L complexes with functionalized acetylide ligands were prepared (L=phenyl, pyrenyl or naphthalimide acetylides). The absorption of the pyrene and naphthalimide derived Pt(II) complexes in the visible region of the spectrum was enhanced relative to the phenylethenyl substituted model complex. Long-lived deep-red emissions were observed for the pyrene (83.7μs) and naphthalimide...
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