White upconversion emission in Er3+/Yb3+/Tm3+ codoped LiTaO3 polycrystals

Rare-earth doped colour tuneable up-conversion ZBLAN phosphor for enhancing photocatalysis

“…For photocatalytic activity tests, the performance of commercial benchmark TiO 2 Degussa P25 was evaluated for its capacity to degrade Methylene Blue (MB, a typical textile dye used as model contaminant in water compound) from an aqueous solution [29]. The photocatalytic oxidation reaction was carried out in a stirred photoreactor with a capacity of 650 mL with a visible Xe-lamp (Hamamatsu L2274, 150 W, ozone-free model) placed inside the photoreactor as a sun-like irradiation source.…”

“…3) clearly stands out from the absorption spectrum. These features are exploited as an efficient sensitizing infrared antenna, resonant with many inexpensive NIR commercial laser diodes, for activation of luminescence of Er 3+ and Tm 3+ ions by well-known energy transfer processes [26][27][28][29].…”

“…Additionally, Tm 3+ ions also yield intense UV and blue up-conversion emissions due to highly efficient non-resonant ET from the Yb 3+ : 2 F 5/2 state to the Tm 3+ : 3 H 5 state, and subsequent excitations to higher energy levels. Therefore, the combination of Yb 3+ -Er 3+ -Tm 3+ give rise to efficient simultaneous red, green and blue up-conversion emissions leading to the generation of white light [29][30][31]. Moreover, the ratio between these up-conversion emission bands can be varied by changing pump power intensity resulting in the development of colour tuneable up-conversion phosphor, with great importance for general lighting appliances and integrated optical devices [32][33][34].…”

Rare earth doped NaYF4 nanorods: Synthesis and up-conversion luminescence spanning deep-ultraviolet to near-infrared regions

“…Over the past few decades, frequency up-conversion from NIR to visible/UV in nanomaterials doped with rare earth ions, such as Yb 3+ , Er 3+ , Tm 3+ , Ho 3+ , Ce 3+ and Gd 3+ has been extensively investigated, due to their potential applications such as multicolor three dimensional displays, solid-state lasers, white LED and fluorescent label [1][2][3][4][5][6][7]. Among these rare earth ions, Yb 3+ with single electronic excited-state, located at approximately 10,000 cm À1 , is usually added as a sensitizer [8].…”

Preparation, crystal structure and up-conversion luminescence of Er3+, Yb3+ co-doped Gd2(WO4)3

“…1,2 The UC luminescence has attracted a lot of interest from researchers because of its wide potential applications, such as bio-labels, solar cells, optical data storage, displays and so on. [3][4][5][6][7][8][9] For UC phosphors, the excellent fluorescence is always achieved by doping rare earth (RE) ions into luminescent hosts. Among various ions, Er 3+ is the one of the most studied active ions.…”