Near infrared photoluminescence of ytterbium(III) complexes from tripodal ligands with different coordination conformations

Covalently bonded Ln(III) hybrid materials showing dual properties of visible to near infrared photoluminescence and gas adsorption

“…Lanthanide complexes have been attracting much attention in recent years due to their ability to emit intense and characteristic photoluminescence based on the "antenna effect" of organic ligands [1][2][3][4][5]. However, due to the poor mechanical, thermal and soluble properties, their potential applications in such fields as OLED, chemosensor and bio-assays cannot be fully applied.…”

“…According to the common coordination structure of NTB-type ligand with lanthanide ions [4,5], the central Ln 3+ ion is hosted in the cavity formed by the tripodal ligand. The four N atoms on the ligand coordinate with rare earth metal centers, allowing an effective energy transfer to the emitting levels of Ln 3+ , and the silicon ester groups on the ligand hydrolyze together with the hydrolysis of TEOS, leading to the formation of organic-inorganic hybrid materials.…”

“…The coordination of N atoms on Si-CNTB with Ln(III) ions afforded efficient luminescent centers and the co-hydrolyzation of silane groups with TEOS (tetraethoxysilane) produced covalently linked hybrid particles in sub-micron scale. Visible to near infrared photoluminescence and N 2 adsorption properties were observed in this new type of inorganic-organic hybrid materials.Lanthanide complexes have been attracting much attention in recent years due to their ability to emit intense and characteristic photoluminescence based on the "antenna effect" of organic ligands [1][2][3][4][5]. However, due to the poor mechanical, thermal and soluble properties, their potential applications in such fields as OLED, chemosensor and bio-assays cannot be fully applied.…”

“…The life time of the peak at 580 nm is measured to be 3.3 ms, characteristic of the f → f emission of Tb 3+ ion. In the near infrared region, the hybrid materials emit the characteristic spectra of Yb(III) at 980 nm ( 2 F 5/2 → 2 F 7/2 ) or Er(III) at 1550 nm ( 4 I 13/2 → 4 F 15/2 ), and the lifetime for these two emissions are 19.5 and 29 μs, respectively, longer than the emissions for pure NTB based coordination compounds [5]. The gas adsorption behavior of the hybrid particles was investigated with N 2 at 77 K. The as-synthesized samples (weight 50-100 mg) were dried under high vacuum at 80°C for 24 h to remove solvent molecules prior to measurements.…”

One novel near-infrared ytterbium metal–organic framework based on an unprecedented [Yb6(μ2-OH)2(μ3-OH)6]10 + cluster

“…In addition to the photoluminescence in visible region, Yb(III)-based systems are known to be able to exhibit near-infrared (NIR) fluorescence [39][40][41]. Meantime, the H 2 bpdyc ligand was regarded as a reliable chromophore, which might help to sensitize the lanthanide cation luminescence.…”