Stability, glass forming ability and spectral properties of Ho/Yb co-doped TeO2–WO3–ZnX(X=O/F2/Cl2) system

Bandwidth enhancement of MIR emission in Yb3+/Er3+/Dy3+triply doped fluoro-tellurite glass

“…For example, if the excitation is at 800 nm then a fourth order harmonic peak appears at ~3200 nm and if ~980 nm is the excitation wavelength then a third order harmonic peak appears at ~2940 nm which are very close to the MIR emission transitions of Ho 3+ (~2.85 µm), Er 3+ (~2.76 µm), Dy 3+ (~2.95 µm) ions. There are such erroneous reports in low phonon oxide based glasses with considerable OH − content in the glass [26,34,35]. In this study, the MIR emission spectrum was recorded at RT with utmost care using proper low and high pass filters at the excitation and emission channels respectively as described elsewhere [23].…”

A feasible strategy to synthesize LaOI:Yb3+/Ho3+ upconversion luminescence nanostructures via succeeding to the morphologies of precursors

“…UC emission spectra of the LaOI:1.0%Yb 3+ /0.5%Ho 3+ nanofibers and nanobelts under the excitation of a 980-nm diode laser. 5 I 8 [22][23][24][25].It should be noticed that, with the increase of Yb 3+ concentration, the back energy transfer (BET) of 5 F 4 / 5 S 2 (Ho) + 2 F 7/2 (Yb) ? 5 I 6 (Ho) + 2 F 5/2 (Yb) and 5 F 5 (Ho) + 5 F 7/2 (Yb) ?…”

“…[20,21]. Up to now, many Yb 3+ /Ho 3+ co-doped materials have been synthesized, such as, Yb/Ho co-doped (Gd 1Àx Lu x ) 3 Al 5 O 12 (x = 0.1-0.5) garnet [22], NaLuF 4 :Yb 3+ /Ho 3+ microprisms [23], Ho 3+ -Yb 3+ co-doped transparent oxyfluoride glass-ceramics [24], Ho/Yb co-doped TeO 2 -WO 3 -ZnX (X = O/F 2 /Cl 2 ) [25], etc.…”

Role of Yb3+ ions on enhanced ~2.9 μm emission from Ho3+ ions in low phonon oxide glass system

“…However, the reported ~4 μm emission from Ho 3+ ions is subject to revision since harmonic peak of Ho 3+ : ~2 μm emission arises exactly at ~4 μm and it is very difficult to eliminate this harmonic peak unless one suppresses the ~2 μm emission by using a proper high pass IR cut-on filter >2 μm. Also, there is no mention of filters used while recording the ~4 μm MIR emission in their report 13 14 .…”

“…In this contest, tellurite glasses (transparency upto ~6 μm) have been under strenuous study because of their advantages over fluoride and chalcogenide based glasses. There are few reports on ~2.7 μm emission from Er 3+ ions 8 9 10 , ~2.8 μm, ~4 μm from Ho 3+ ions 11 , 12 , 13 , 14 and ~2.9 μm, ~3.3 μm from Dy 3+ ions 15 16 when doped in tellurite glasses. However, the reported ~4 μm emission from Ho 3+ ions is subject to revision since harmonic peak of Ho 3+ : ~2 μm emission arises exactly at ~4 μm and it is very difficult to eliminate this harmonic peak unless one suppresses the ~2 μm emission by using a proper high pass IR cut-on filter >2 μm.…”