A bright yellow light from a Yb³⁺,Er³⁺-co-doped Y₂SiO₅upconversion luminescence material

Abstract

A bright yellow light from Yb3+and Er3+doped Y2SiO5upconversion materials in particle and fiber form were prepared by a co-precipitation, and electrospinning method.

Photocatalytic activity of Yb, Er, Ce‐codoped TiO2 for degradation of Rhodamine B and 4‐chlorophenol

“…(b)). The mechanism of this process can be found elsewhere . On the contrary, these peaks were not observed for the TiO 2 , and TiO 2 –Ce 0.14 samples.…”

“…In the case of TiO 2 –Er 0.15 Yb 0.15 and TiO 2 –Er 0.15 Yb 0.15 Ce 0.14 , the bands at 522 and 655 nm relate with 4 I 15/2 → 4 F 7/2 , 4 I 15/2 → 2 H 11/2 and 4 I 15/2 → 4 F 9/2 transitions of Er 3+ . The broad band at 982 nm originates from 2 F 7/2 → 2 F 5/2 transition of Yb 3+ . The appearance of these bands exhibited that Yb 3+ and Er 3+ have been successfully incorporated in TiO 2 .…”

Visible Luminescence of Y2SiO5:Tb3+ Powders Excited by Simultaneous Absorption of up to Five Photons in the Short Wavelength IR Band

“…Notice that, after heat treatment at 1050 °C, the absorption peaks associated with the organic compounds (∼1250–1700 cm –1 ) are significantly suppressed. On the other hand, the bands at 1017 cm –1 , 956, 870, and 489 cm –1 are attributed to the Si–O–Si antisymmetric and symmetric stretching vibrations of the silicate (SiO 4 ) group. , Finally, the lowest energy bands, centered at 560, 636, and 717 cm –1 , are associated with vibrational modes related to Y–O coupling. , The room-temperature Raman spectrum of the heat-treated Y 2 SiO 5 :Tb 3+ powder, annealed at 1050 °C, in the range of 400–1100 cm –1 is shown in Figure . It is observed that the sample shows vibrational modes from 450 to 1100 cm –1 , characteristic to the Y 2 SiO 5 structure.…”

“…The selection of the RE host is vital for getting an efficient UC and among the materials of interest, oxy-orthosilicate (Y 2 SiO 5 ) appears as appropriate host matrix for UC. Many authors demonstrated already that Y 2 SiO 5 exhibits excellent thermal and chemical properties and large PL properties when doped with RE ions. − …”

VUV spectroscopy of lanthanide doped fluoride crystals K2YF5

“…In recent decades, the spectroscopy of lanthanide (Ln) ions doped oxide and fluoride crystals is an interesting research subject because of abundant applications of such materials [1][2][3][4][5]. In the comparison with oxide crystals, the fluoride crystals have been shown to have more advantages such as: (i) large band gap yielding the emission from the high energy levels of Ln ions; (ii) weak nephelauxetic effect and a moderate crystal-field strength generating the narrow emission bands as well as a long lifetime of excited levels within 4f electron configuration and (iii) low phonon energy leading to a high quantum efficiency of luminescence from some excited levels [6][7][8][9][10].…”