Monovalent copper-mediated UV to NIR luminescence down-shifting in Yb³⁺-doped glass

Abstract

Sensitized NIR emission from Yb3+ ions is realized under near-UV excitation of Cu+ and a Cu2+–Yb2+ CTS model is proposed to explain the luminescence down-shifting.

Impact of Lanthanide (Nd3+, Gd3+, and Yb3+) Ionic Field Strength on the Structure and Thermal Expansion of Phosphate Glasses

“…It shows the characteristic UV type B emission peak of Gd 3+ ions around 312 nm corresponding to 6 P 7/2 → 8 S 7/2 transitions. , Finally, Figure c shows the PL spectrum of the Yb glass recorded under the excitation of O 2– –Yb 3+ charge transfer transitions at 300 nm . It thus exhibits the broad NIR 2 F 5/2 → 2 F 7/2 emission from Yb 3+ ions. , Overall, the XRD and optical spectroscopy data support the effective synthesis of the glasses. We then proceeded to evaluate glass densities and basic physical properties next.…”

“…The typical Nd 3+4 F 3/2 → 4 I 9/2 , 4 I 11/2 , 4 I 13/2 NIR transitions are observed around 890, 1056, and 1330 nm, respectively. , The Gd glass was excited at 273 nm to promote 8 S 7/2 → 6 I J transitions in Gd 3+ ions, and the spectrum obtained is shown in Figure b. It shows the characteristic UV type B emission peak of Gd 3+ ions around 312 nm corresponding to 6 P 7/2 → 8 S 7/2 transitions. , Finally, Figure c shows the PL spectrum of the Yb glass recorded under the excitation of O 2– –Yb 3+ charge transfer transitions at 300 nm . It thus exhibits the broad NIR 2 F 5/2 → 2 F 7/2 emission from Yb 3+ ions. , Overall, the XRD and optical spectroscopy data support the effective synthesis of the glasses.…”

“…The optical absorption spectra obtained for the four glasses under consideration are shown in Figure . The Yb glass displays conspicuously the 2 F 7/2 → 2 F 5/2 near-infrared (NIR) absorption peak of Yb 3+ ions around 975 nm. , The Nd glass exhibits the different transitions spanning from the NIR to the visible range, most prominently the absorption peak around 583 nm in connection with 4 I 9/2 → 4 G 5/2 + 2 G 7/2 transitions in Nd 3+ ions. ,, The Gd glass, on the other hand, shows an absorption profile in good resemblance with the undoped Ba glass host. This is because the Gd 3+ electronic transitions responsible for light absorption lie in the UV within the region where the glass host also absorbs. , …”

“…Glasses activated with trivalent lanthanide ions (Ln 3+ ) have been the subject of extensive research given the diversity of radiative electronic transitions making them valuable for a variety of applications as optical materials. − Among the different trivalent lanthanides, Nd 3+ , − Gd 3+ , , and Yb 3+ , − are attractive for use in laser materials, phototherapy lamps, and solar spectral converters. With respect to these, a distinctiveness in terms of their relative positions in the periodic table of elements is that the three lanthanides are far apart with atomic numbers of 60 (Nd), 64 (Gd), and 70 (Yb).…”

“…The present work was then undertaken with the purpose of evaluating the composition–structure relationship in Ln 3+ -containing phosphate glasses, focusing on thermal/dilatometric properties scarcely scrutinized. Using as a starting point the high metal solubility 50P 2 O 5 –50BaO glass matrix previously considered in the context of various photonic applications, ,,, the glasses were made with 50P 2 O 5 –46BaO–4Ln 2 O 3 (mol %) nominal compositions where Ln = Nd, Gd, and Yb. The glasses were synthesized by the melt-quenching technique, followed by an experimental investigation encompassing measurements by X-ray diffraction (XRD), optical absorption, photoluminescence (PL) spectroscopy, density, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and dilatometry.…”