Molecular dysprosium complexes for white-light and near-infrared emission controlled by the coordination environment

Structure, Thermal Properties and Photoluminescence of Terbium and Dysprosium Mixed‐Ligand Complexes with Dimethyl‐N‐Trichloroacetylamidophosphate and 2,2’‐Bipyridine

“…The photoluminescence of [Dy(L) 3 bipy] was registered in both visible and near‐infrared regions (Figure 3b and c). The obtained spectra are characterized by the presence of sharp emission bands of Dy III f‐f transitions and the absence of ligands’ fluorescence bands, which is often observed for mixed‐ligand dysprosium tris ‐complexes based on β‐diketones due to insufficient energy gap between the ligands triplet state and emissive level of Dy III ion [9,13] . In the range of visible light (Figure 3b) the hypersensitive peak (575 nm), which corresponds to yellow emission, is stronger than the blue emission (481 and 486 nm).…”

“…The intensity of the first band associated with the 4 F 9/2 → 6 H 7/2 + 6 F 9/2 transitions may not be displayed correctly since both R928P and DSS‐IGA020 L detectors have low spectral response in the 800–900 nm wavelength range. The bands of 4 F 9/2 → 6 F 7/2 (970–1025 nm) and 4 F 9/2 → 6 F 5/2 (1130–1205 nm) transitions in the spectrum of [Dy(L) 3 bipy] have rather high intensities, that makes the spectrum looks like spectra of dysprosium mixed‐ligand tris ‐complexes based on β‐diketones [13,46] and differs from the spectrum of CAPh based dysprosium tetrakis‐complex [Na 2 Dy(CAPh) 4 (OTf)DMF] [19] . The less intense bands in the NIR emission spectrum of [Dy(L) 3 bipy] have been assigned to transitions 4 F 9/2 → 6 H 5/2 (900–960 nm), 4 F 11/2 + 6 H 9/2 → 6 F 5/2 (1280–1290 nm), 4 F 9/2 → 6 F 1/2 (1375–1400 nm), and 6 F 5/2 → 6 H 11/2 (1480–1550 nm).…”

“…6 F 7/2 (970-1025 nm) and 4 F 9/2 ! 6 F 5/2 (1130-1205 nm) transitions in the spectrum of [Dy(L) 3 bipy] have rather high intensities, that makes the spectrum looks like spectra of dysprosium mixed-ligand tris-complexes based on βdiketones [13,46] and differs from the spectrum of CAPh based dysprosium tetrakis-complex [Na 2 Dy(CAPh) 4 (OTf)DMF]. [19] The less intense bands in the NIR emission spectrum of [Dy(L) 3 bipy] have been assigned to transitions 4 F 9/2 !…”

“…[8,9] The terbium-and dysprosium-containing compounds are known to be efficient emitters of green and yellow light respectively. [10][11][12] Dysprosium is also considered as a source of white light for OLED technology [13][14][15] and of near infrared-emission, which is of interest for optical amplifiers. [16] Thus, the search for effective sensitizers for Tb III and Dy III ions luminescence is an actual task.…”

Tuning white light emission using single-component tetrachroic Dy3+ metallacrowns: the role of chromophoric building blocks

“…Alternatively, to produce WLE, the combination of emission signals arising from a single visible-emitting Ln 3+ and organic ligands or inorganic matrix can be used. 34,35 The validity of this approach has been demonstrated for molecular Eu 3+ compounds, 36 as well as for Dy 3+ compounds. Some of these Dy 3+ compounds were shown to be tunable by ligand modifications, 37 as well as by excitation wavelength 38 or by the change of the experimental temperatures.…”