Evolution in the Oxidation Valences and Sensitization Effect of Copper Through Modifying Glass Structure and Sn²⁺/Si Codoping

Abstract

Currently, coupling noble metal species with rare-earth cations (REI) in amorphous materials has attracted persistent attention, owing to the significant rise in the emission intensity and nonlinear optical response, which allow various potential applications in photoelectric fields. However, the primary investigations are focused on Au-and Ag-doped systems, and there are few systematic reports concerning the interaction between REI and the different oxidation states of copper so far. Herein, we demonstrated the evolution of copper oxidation valences from Cu 2+ to Cu + , and then to Cu 0 (Cu NPs), and the corresponding effects on Tb 3+ emissions in borate glasses were systematically investigated by modifying glass structure and Sn 2+ /Si codoping. With increasing the ratio of B 2 O 3 to Li 2 O, enhancement of reduction efficiency of Cu 2+ to Cu + was observed. Impressively, the ns 2 -type Sn 2+ emission centers not only generate efficient sensitizers for Tb 3+ but also lead to efficient reduction in Cu 2+ to Cu + . Based on absorption/transmittance, photoluminescence excitation/emission, and time-resolved decay spectra, the interplay mechanisms between Tb 3+ and the different valences of copper were discussed in detail.

Influences of copper–potassium ion exchange process on the optical bandgaps and spectroscopic properties of Cr3+/Yb3+ co-doped in lanthanum aluminosilicate glasses

“…The emission peak shi at 488 nm of Cr 3+ is assigned to the role of Cu + cations. This result is also consistent with the suggestions discussed in the paper 53 of Tian-Shuai Lv et al The increases in visible emission intensity of Cr 3+ /Yb 3+ codoped band centered at 488 nm and 653 nm were assigned to the energy transfer (ET 1 ) process from 3 E g (T 2g ) / 1 A g transition of Cu + to 2 T 2 / 4 A 2g transition of Cr 3+ , 47,48 and to the ET 2 process from 3 E g (T 1g ) / 1 A g transition of Cu + to 4 T 2g ( 4 F) / 4 A 2g transition of Cr 3+ , 47,48 respectively. These two ET 1 , ET 2 processes are proposed as follows:…”

“…The emission peak shift at 488 nm of Cr 3+ is assigned to the role of Cu + cations. This result is also consistent with the suggestions discussed in the paper 53 of Tian-Shuai Lv et al…”

Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd3+

“…On the other hand, silicon powder has been recently proposed for producing plasmonic Ag nanocomposite phosphate glasses also possessing improved transparency in the UV . Indeed, the value of silicon has been demonstrated for producing diverse glasses with interesting optical properties. − However, the sole use of silicon powder to produce the increase in UV light transmission has not been investigated in detail to the best of the author’s knowledge. Moreover, the impact of the Si-induced UV transparency on the UVB emission of Gd 3+ is still to be unveiled.…”

XANES analysis of phosphate glasses melted with Tb4O7 and SnO: evaluating the impact of valence states on structural, thermal, and luminescent properties

“…, added as SnO) has been considered an interesting ns 2 -type center with blue-emitting character. 4,5,19 Further, as first reported by Blinov et al 20 and supported by the work of Wang and Gan, 4 Sn 2+ ions can act as sensitizers for Tb 3+ ions in glasses, thus enhancing their green-emitting character. Inorganic glasses are appealing as hosts for optical applications given the relative ease of preparation ( e.g.…”