An erbium(III)-based NIR emitter with a highly conjugated β-diketonate for blue-region sensitization

Seven‐Coordinate Luminophores: Brilliant Luminescence of Lanthanide Complexes with C3v Geometrical Structures

“…Various type of lanthanide complexes with photosensitized ligand have been reported. [44][45][46][47][48] Tb(tmh)3(tppo) exhibited excitation peak in UV region ( Figure S3). Luminescent seven-coordinate Eu III complex excited at around 450 nm (visible region) may be ideal phosphor for applications such as LEDs, biomarkers, and chemical sensing devices.…”

Visible and near-infrared light-driven photocatalytic activity of erbium-doped CaTiO3 system

“…In the same way, several bands located in the near-infrared region were observed at 802, 980 and 1520 nm. These absorption bands would correspond to the transitions from the 4 I 15/2 ground state to 4 I 9/2 , 4 I 11/2 and 4 I 13/2 Er 3+ excited states [25]. The BET surface areas for the Er 3+ doped CaTiO 3 samples are shown in Table 1.…”

Synthesis, structure, theoretical studies and luminescent properties of a ternary erbium(III) complex with acetylacetone and bathophenanthroline ligands

“…In spite of the possible PL reabsorption, the obtained decay shows single exponential behavior, with a time constant of 1.02 µs. This value, typical of lanthanide complexes [13,70,77] (and far smaller than the emission decay time of the isolated ion, τ≈8 ms), is due to vibronic coupling with high energy C-H stretching vibrations in the neighbourhood of the Er 3+ ion (originated from the ligands), which lead to quenching of the excited state (because of the relatively small energy gap between the excited state 4 I 13/2 and the ground state). For comparison purposes, this lifetime value is five times larger than that reported for erbium(III) tris (8-hydroxyquinolate) or ErQ 3 (0.2 µs in powder form) [47], but significantly smaller than those attained for Er(F-tpip) 3 (where HF-tpip stands for tetrapentafluorophenylimidodiphosphinate) [78] or for perfluorinated nitrosopyrazolone-based erbium chelates [79]: 164 µs and 15.7 µs, respectively.…”

“…Furthermore, no cheap pump sources are available in the UV [68]. Thus, one of the growing challenges in the chemistry of the lanthanide ions is to develop NIR luminescent lanthanide complexes that can be sensitized in the visible range (>400 nm) [69,70]. Consequently, the ability to predict at which wavelength can a complex be excited is deemed crucial, and computational chemistry tools that can reliably model and predict the absorption and luminescent properties hold great potential so as to speed-up this materials design process.…”