P concentration dependence of local structure around Yb³⁺ ions and optical properties in Yb–P-doped silica glasses

Abstract

Local structure around Yb 3+ ions in Yb-P-doped silica glasses and its P concentration dependence were elucidated by EXAFS measurements. Yb-O coordination number was found to change from 4 → 8 → 6 → 7 ∼ 8 with increasing the atomic ratio P/Yb. This strange change can be corresponded to the local structure changes in the order of YbPO 4 -like, Yb(PO 3 ) 3 -like to YbP 5 O 14 -like local structures. This correspondence is supported by various optical measurements, such as the Rayleigh/Mie scattering, Raman scattering, absorption cross-section, CT transition, and X-ray induced defect formation, which were also found to depend on P/Yb. These results provide a guideline of the suitable P concentration in RE-P-doped silica glasses for various applications.

Theoretical and experimental investigation of Al3+ ion-suppressed phase-separation structures in rare-earth-doped high-phosphorus silica glasses

“…35 In Er-Yb co-doped high-phosphorus silica-based glasses, the enrichment of phosphorus elements is usually accompanied by the aggregation of RE ions, which is also considered to be a precursor to glass crystallization, which is undoubtedly detrimental for high-power fiber laser materials. 30,33 To solve this problem, we started using active precursor powders to promote the homogeneous mixing of each doping element at the molecular level, ensuring that the local enrichment of phosphorus elements can occur homogeneously throughout the glass network during vitrification. At this point, the Al 3+ ions latent in the precursor powder can continuously trim the degree of cross-linking of the phosphate glass network during the vitrification process to achieve homogeneous trimming of the large phosphorus-rich areas into numerous small phosphorus-rich areas, thereby achieving a homogeneous distribution of the phosphate network throughout the glass network.…”

“…35 In the phosphorus-rich region, energy transfer between RE ions can easily occur because of the short distance between RE-RE ions. 30,33 In addition, the PQO double bonds, which are widely present in the P-rich region, have a high phonon energy, which is favorable for suppressing the reverse energy transfer from the excited state of Er 3+ ions to Yb 3+ ions, thus substantially improving the efficiency of energy transfer from Yb 3+ ions to Er 3+ ions. 30,33 However, the short distance between Re ions increases the possibility of RE ion clustering.…”

“…a Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics Highly phosphorus doped silica-based composite glasses are a key research area for high power gain fibers owing to their high solubility for RE ions and excellent anti-photon darkening capability. [26][27][28][29][30] In recent years, an increasing number of studies have been devoted to modulating the degree of constraint of the phosphate network on RE ions in order to achieve a balance between high luminescence efficiency and high doping homogeneity. [30][31][32][33] Likhachev et al prepared high-quality phosphorus-silica composite glass fibers by using the multilayer modified chemical vapor deposition (MCVD) technique.…”

“…[26][27][28][29][30] In recent years, an increasing number of studies have been devoted to modulating the degree of constraint of the phosphate network on RE ions in order to achieve a balance between high luminescence efficiency and high doping homogeneity. [30][31][32][33] Likhachev et al prepared high-quality phosphorus-silica composite glass fibers by using the multilayer modified chemical vapor deposition (MCVD) technique. 26,27 This multilayer deposition and interdiffusion method improved the doping homogeneity of RE ions to some extent.…”

Effect of UV irradiation on photoluminescence of Er3+ions in matrices of metal oxides and fluorides

“…The intensity of optical f-f transitions depends both on the crystal structure of the matrix and on the presence of intrinsic and extrinsic defects in a given host crystal or glass [1][2][3]. The latter opens are the way to control the luminescence of RE phosphors by introducing various impurities into the matrices [4]. In our previous work [5] it was demonstrated by diffuse reflectance spectroscopy (DRS) that UV irradiation of zirconia doped with Er and Yb ions changes the intensity of corresponding f-f absorption bands.…”