Crystallization control in Ni²⁺‐doped glass‐ceramics for broadband near‐infrared luminesce

Abstract

The research of doped photonic glass has recently attracted much attention owning to the significant applications in various fields, including lasers, photovoltaics, and optical amplification. In this work, we present the design, fabrication, and experimental implementation of a novel fluorosilicate photonic glass‐ceramics with broadband luminescence. We demonstrate that precipitated nanocrystals can be tuned by changing the heat‐treatment temperature. This proposal offers an excellent opportunity for controlling the local environment around Ni2+ dopant. Consequently, the broadband and flat emission covering a waveband from 1200 to 2400 nm with a bandwidth of 605 nm can be realized. The possible physical mechanism, which can be attributed to the gradual change of nanocrystals from K2SiF6 to KCdF3 with the enhancement of the heat‐treatment temperature, is also discussed.

Doping and luminescence mechanisms of broadband NIR‐II emitting Zn2(1−x)Ni2xGa3Ge0.75O8 nanoparticles

“…value is found to be about 1.14. This value is close to those (≈1.10) in the cases of Ni 2+ ions occupying octahedral sites in other hosts, such as oxide and fluorine compounds, 29,41,42 indicating that the transition attribution of Ni 2+ occupying octahedral sites in the ZGGO host lattices is reasonable.…”

“…According to the reported studies on Ni 2+activated luminescence materials, such as Ni 2+ -doped SrTiO 3 :Ni 2+ , Zn 3 Ga 2 Ge 2 O 10 :Ni 2+ , and K 2 SiF 6 :Ni 2+ , their multi-peak emission spectra suggest the existed multiple sites occupied by Ni 2+ ions. [29][30][31] Therefore, it is possible that there exist two sorts of lattice sites occupied by Ni 2+ ions in the spinel ZGGO host.…”

Heat-Induced Emission Enhancement in a Yb:YAG Crystal-Derived Silica Fiber

“…However, owing to the high-temperature fiber drawing process, silica from the cladding was dissolved into the YAG melt, forming an amorphous phase, leading to the broadband emission peak at 1017 nm and Raman peaks, as shown in Figure 6b. Heat treatment at an appropriate temperature leads to the rearrangement of the ionic bond and the formation of the Y 2 Si 2 O 7 crystals [36], as presented in Figure 6c. The combination of the two local environments around Yb ions resulted in improvements in the spectral properties of Yb ions.…”