153088-89-2Relevant academic research and scientific papers
A new tetrakis β-diketone ligand for NIR emitting LnIII ions: Luminescent doped PMMA films and flexible resins for advanced photonic applications
Biju, Silvanose,Eom, Yu Kyung,Buenzli, Jean-Claude G.,Kim, Hwan Kyu
, p. 6935 - 6944 (2013)
A new antenna molecule containing four benzoyltrifluoroacetone (BTFA) moieties anchored to a single carbon atom and connected through four flexible methoxy groups, namely 1,1′-(4,4′-(2,2-bis((4-(4,4,4-trifluoro-3- oxobutanoyl)phenoxy)methyl) propane-1,3-diyl)bis(oxy)bis(4,1-phenylene))bis(4,4, 4-trifluorobutane-1,3-dione) [H4L], has been designed and synthesized. Using this ligand, a series of homo- and hetero-metallic Ln III complexes of general formula [LnL]NBu4 (where Ln = Sm (1), Gd (2), Er (3), Yb (4), Er0.5Yb0.5 (5), Er 0.5Gd0.5 (6), Yb0.5Gd0.5 (7) and NBu4 = tetrabutyl ammonium) have been isolated. All these complexes have high molar absorption coefficients (>40:000 M-1 cm -1 around 330 nm in DMF) and display strong visible (Sm III) and/or, NIR (SmIII, ErIII, Yb III) luminescence in solid state and in DMF solution upon irradiation at the ligand-centred bands in the range 250-400 nm. Furthermore, these complexes have been doped into PMMA matrices yielding highly luminescent, photo-stable films and flexible resins made of fibres with average diameter 300-400 nm. Photoluminescence studies show that the newly designed ligand is an adequate sensitizer for SmIII, YbIII and ErIII luminescence. The emission quantum yields and the luminescence lifetimes at room-temperature are 3.4 ± 0.5% and 79.1 ± 1 μs for Sm III and 2.6 ± 0.4% and 12.1 ± 0.1 μs for Yb III in solid state. Furthermore the overall quantum yields and lifetime measurements for the mixed metallic complex show that YbIII → ErIII energy transfer occurs resulting in enhanced Er III emission.
