Structural and optical properties of Ho2TeO6 micro-crystals embedded in tellurite matrix

Broadband Near‐Infrared Down‐Shifting by Yb–O Charge‐Transfer Band in Yb3+ Singly Doped Tellurite Glasses

“…The band gap energy ( E g ) of the ZTN tellurite glass is determined to be 3.91 eV by extrapolation to F ( R ) = 0 according to the documented method . The E g value obtained in this work is closed to the reported value (~3.74 eV) as in Ho 2 TeO 6 matrix . Figure (b) shows the transmittance spectrum of ZTN: Yb 12 glass and the inset is the photograph of this glass under sunlight.…”

Near‐Infrared Quantum Cutting via Downconversion Energy Transfers in Ho3+/Yb3+ Codoped Tellurite Glass Ceramics

“…Therefore, the broad hump due to glass phase is almost disappeared and only the sharp diffraction peaks corresponding to TeO 2 crystalline are observed after heat treatment. Based on the diffraction peak widths, the mean size ( D ) of the TeO 2 microcrystalline were evaluated by Scherrer equation: where λ is the X‐ray wavelength (1.54056 Ǻ), β the full width at half maximum of the diffraction peak, and θ the diffraction angle, and the constant K = 0.9. It gives the size of the crystals about 48 nm.…”

“…The Yb 3+ high concentrated samples ( x = 10, 20) requires higher melting temperature and longer reaction time as reported by our previous work . The obtained as‐prepared glasses (AG) were annealed at 330°C (near the glass temperature T g of the tellurite glass) for 6 h to eliminate internal stress. After annealing, the glasses were heat‐treated at 450°C (around the crystallize temperature T x of the tellurite glass) for more than 10 h and the transparent glasses ceramics (GC) were obtained.…”

“…However, facile tellurite glasses with wide transmission region (3.5–5 μm), good glass stability and corrosion resistance, and a relatively low phonon energy are of technical interest and these properties combined with good chemical and crystallization properties make tellurite glasses as one of the suitable hosts for NIR QC. Previous studies have proved that efficient downconversion could occur in tellurite glasses owing to the fact that they combine advantages of superior chemical and mechanical stability and low phonon energy (~700 cm −1 ) …”

“…Previous studies have proved that efficient downconversion could occur in tellurite glasses owing to the fact that they combine advantages of superior chemical and mechanical stability and low phonon energy (~700 cm À1 ). [11][12][13][14] When taking into account of enhancing the QE of siliconbased solar cell, the acceptor is generally Yb 3+ , whose emission energy is just above the band gap of Si. And the donor could be chosen as Ln 3+ (Ln = Nd, 5 Pr, 6,7 Tb, 8,12 Tm, 9 Er, 15 etc.,).…”