An Upconversion Niobium Pentoxide Bulk Glass Codoped with Er³⁺/Yb³⁺ Fabricated by Aerodynamic Levitation Method

Abstract

82x)NbO 2.5 -17.4LaO 1.5 -xZrO 2 (NLZ) (x = 7.5, 10, 12.5, 15, 17.5, and 20) bulk glasses codoped with Er 3+ /Yb 3+ were successfully fabricated by aerodynamic levitation method for the first time. The structure, thermal stability, and luminescent properties of the samples were investigated systemically by XRD, differential scanning calorimetry, and upconversion spectra. Under 980 nm laser excitation, all samples exhibited green and red upconversion emissions centered at 531, 546, and 674 nm. Results showed that the sample with 15 mol% ZrO 2 obtained the most efficient upconversion luminescence and good thermal stability with the glass-transition temperature as high as 743°C. The effect of the addition of ZrO 2 on the structure behavior and the phonon density in the glass was investigated by Raman spectra, which are the key factors for the upconversion luminescence intensity. P. Lucas-contributing editor Manuscript No. 35647.

Upconversion 32Nb2O5–10La2O3–16ZrO2 glass activated with Er3+/Yb3+ and dye sensitized solar cell application

“…The luminescence mechanism is showed in Fig. 4, which has been illustrated in the previous work [21]. Some new phenomena occurred in our experiments.…”

“…In the glasses containing modified ions, the local environment of rare earth ions is defined preferentially by non-bridging oxygens [29]. In NLZ glass, Nb 2 O 5 is used as network modifier, which has non-bridging oxygens [21] and contributes to the glass matrix to host a high content of rare earth ions.…”

“…The different Ta 2 O 5 doping concentrations were studied at the same time [20]. Nb 2 O 5 is used as network modifier, which has non-bridging oxygens [21] and contributes to host a content of rare earth ions. Niobium pentoxide is a candidate matrix material for efficient conversion of luminescence materials because the high valence of Nb 2 O 5 is in favor of the upconversion of the rare earth elements.…”

Study on optical properties and luminescence of Er3+/Yb3+ co-doped La2O3-Nb2O5-Ta2O5 glasses prepared by aerodynamic levitation

“…However, it's difficult to prepare bulk heavy-metal oxide glasses by conventional techniques. Containerless processing methods can constrain heterogeneous nucleation, obtain deep undercooling, and achieve fast solidification [13,14]. It's very favorable to fabricate new glasses which can't be obtained by conventional methods.…”

Structure and optical properties of Er‐doped CaO‐Al2O3 (Ga2O3) glasses fabricated by aerodynamic levitation

“…Rare‐earth (RE)‐doped glasses and glass‐ceramics have been extensively studied as important materials for wide applications in optical amplifier, optical fiber laser, up‐converter, etc . Up to the present, there are only few works that investigate the fabrication of RE‐doped glasses by levitation melting method . Here, we choose calcium aluminate glasses which have been proposed as materials for infrared windows, high‐strength optical fibers, and potential photomemory materials .…”