Topological Engineering of Photoluminescence Properties of Bismuth‐ or Erbium‐Doped Phosphosilicate Glass of Arbitrary P₂O₅ to SiO₂ Ratio

Abstract

research to applied industrial and social applications including but certainly not limited to window glasses, windscreens, kitchen cooktops, microscope and telescope lens, and optics, and so on, owing to such unmatched and outstanding properties as ease of large-scale and complex shape production as well as chemical and mechanical durability. [1] However, glasses, usually made by the traditional melt-quenching method viz., cooling a viscous liquid fast enough to avoid crystallization (known as supercooling), [2] are seriously constrained to those that entail an acceptable degree of glass-forming ability unless otherwise being made under extremely harsh conditions (e.g., superfast cooling or high-energy irradiation, etc.) that are not readily available to ordinary glass-making labs and factories. [3] This leads to a significantly limited range of available constituents and functions of the obtained glasses. For example, spectroscopic features of active dopants (e.g., rare-earth (REs) ions, transition, and main group metals) are closely associated with their chemical states and the surrounding chemical environments provided by the glass host; hence, it is possible to induce new photoluminescence (PL) functions such as ultrabroadband and enhanced up-/down-conversion emissions via proper doping, post thermal, and magnetic treatments or A new method is reported to achieve the manufacture of glass of arbitrary ratio of SiO 2 /P 2 O 5 which cannot be made by conventional melt-quenching method. The new method is termed "melt-in-melt" which encapsulates the key step in the glass manufacturing process, i.e. one molten glass is poured into another molten glass with a stirring at high temperatures. Because of near unlimited possibilities in designing new glass compositions, there is a correspondingly great degree of freedom in the topological engineering of the glass structure, which in turn strongly influences the photoluminescence (PL) properties of active dopants. As a proof concept, bismuth and erbium are selected as the indicator dopants for emphasizing the real advantages of the new method as an effective means to tailoring the PL properties of the doped glasses. The micro structure and element distribution within the fabricated glasses are comprehensively characterized by high-resolution scanning electron microscopy, micro-Raman and high-performance X-ray fluorescence spectroscopy. Phase separation occurring at both nano-and meso-scale is observed. Apart from the developed glasses being themselves promising broadband emission phosphors, the new glass-making method may extend the possible applications of glass for important photonic applications (e.g. optical sensing, lighting, display, optical amplification and lasing etc.).

Correlation between ultrabroadband near‐infrared emission and Yb3+/Ni2+ dopants distribution in highly transparent germanate glass‐ceramics containing zinc gallogermanate nanospinels

“…Time‐resolved emission spectra (TRES) were measured by the single photon counting technique. A series of PL decay curves were recorded in the wavelength range from 1050 to 1700 nm at a 3 nm interval, and the TRES were obtained by slicing the recorded PL decay curves measured at the room temperature (300 K) …”

Synthesis, Structural and Optical Properties of Bismuth‐Doped Sol‐Gel‐Derived Phosphosilicate Glasses

“…Besides, under excitation at 808 nm, the cane and its corresponding fiber both show a PL band peaking around 1342 nm, with a FWHM of about 155 nm. Although the wavelength 808 nm matches one of the principal excitation bands of Si‐BAC, the obtained PL band is peaking in an intermediate zone located between those characteristics of P‐BACs and Si‐BACs . This result shows that the bismuth is mainly located in a phosphosilicate environment.…”

“…Recently, amplifying operations have been reported using Ge‐free Bi‐doped phosphosilicate fibers prepared using MCVD process . More recently, a new “melt‐in‐melt” method has been used to prepare Bi‐doped aluminophosphosilicate bulk glasses . Besides, the poor chemical stability of P/Bi‐based complexes, analog to those of Al or Ga used in our previous works, did not allow us to fabricate P/Bi‐codoped silica glasses via post‐doping route of nanoporous silica xerogels with a solution technique.…”

Mixed alkali effects in Er3+‐doped borate glasses: Influence on physical, mechanical, and photoluminescence properties

“…Broadband emission is a favorable character of Er 3+ doped fiber amplifiers (EDFAs) as it contributes to a broad optical amplification. 49,50 In glasses, the emission bandwidth are mainly subject to the inhomogeneous broadening due to the disordered structures and the homogeneous broadening caused by electron-phonon interactions. [49][50][51][52] 54 The PL decay of the emission at 1550 nm can be well fitted by a single exponential function as shown in Figure 5C.…”

“…49,50 In glasses, the emission bandwidth are mainly subject to the inhomogeneous broadening due to the disordered structures and the homogeneous broadening caused by electron-phonon interactions. [49][50][51][52] 54 The PL decay of the emission at 1550 nm can be well fitted by a single exponential function as shown in Figure 5C. In sharp contrast with the PL intensity, the compositional variations of the lifetime manifest the MAE in the Li-Na or Li-K mixing ( Figure 5D).…”