Optimizing Nd/Er ratio for enhancement of broadband near-infrared emission and energy transfer in the Er3+–Nd3+ co-doped transparent silicate glass-ceramics

Reddish-Orange Luminescence from BaF2:Eu3+ Fluoride Nanocrystals Dispersed in Sol-Gel Materials

“…Thus, almost all trivalent Eu 3+ ions were reduced to divalent Eu 2+ ions because only a broad blue emission band corresponding to the 5d-4f transition of the Eu 2+ could be observed in the glass ceramic containing BaF 2 nanocrystals [12]. Crystallization processes and optical properties, especially up-conversion and near-infrared luminescence properties, have been examined mainly for transparent silicate glass-ceramic systems containing BaF 2 nanocrystals and Er 3+ [13] or Er 3+ /Ln 3+ , where Ln = Yb, Nd [14,15,16]. Differences in the luminescence characteristics of rare earth ions in precursor glasses and transparent glass-ceramics can be explained by structural changes in the local environment around the optically active ions.…”

“…The spectroscopic consequence of structural transformation from precursor glasses to TGC systems containing BaF 2 nanocrystals is improvement of luminescent lines of rare earths. The up-conversion and near-infrared luminescence spectra of Er 3+ ions in transparent glass-ceramics containing BaF 2 nanocrystals are greatly enhanced in comparison to precursor silicate glasses [13,14,15,16]. The same situation is also well observed for BaF 2 nanocrystals in silicate TGC systems containing Ho 3+ or Ho 3+ /Tm 3+ /Yb 3+ ions, which have been examined for optical amplifiers at 1.2 µm and near-IR lasers around 2 µm [17], and white up-conversion luminescence applications [18].…”

Defect engineered (Er3+/Nd3+) codoped TiO2 photoanodes for enhanced photoelectrochemical and photovoltaic applications

“…24 This research area has received much attention due to the 4f-4f forbidden energy transitions and +3 oxidation states of RE-ions. [25][26][27][28] These RE-doped TiO 2 photoanodes performed well in photocatalytic, 29,30 photovoltaic, [31][32][33] and photoelectrochemical [34][35][36] applications. Indeed, the trap-site photoinduced charge carrier generation and recombination effects play a vital role in the device performance.…”

“…There are few reports that highlight the signicance of the lanthanide (Er, Nd, and Er : Nd) ions in the increased optical absorption properties of TiO 2 . 28,49 F. Gonell et al 12 reported an Er 3+ /Yb 3+ co-sensitized TiO 2 -based device that exhibited a photocurrent density of 0.8 mA cm −2 . K. K. Mandari et al 50 showed a photocurrent density of 0.8 mA cm −2 using a Gd-inuenced defect site in N-doped TiO 2 .…”

Ultrasensitive Ratiometric Nanothermometer with Large Dynamic Range and Photostability

“…However, for such a tri-doping structure, the cross relaxation in the interlaced energy transfer routes is uncontrollable, and leads to a significant degree of energy loss and unbalanced emissions from different emitters (Figure S1). − …”