Oxide phosphors for light upconversion; Yb3+ and Tm3+ co-doped Y2BaZnO5

Abstract

The optical properties of Yb 3þ and Tm 3þ co-doped Y 2 BaZnO 5 , synthesized by solid-state reaction, are investigated in detail. Three main emission bands centered around 479 nm (blue), 654 nm (red), and 796 nm (near-infrared) are observed under near-infrared laser excitation via an upconversion process. Detailed studies of the upconversion properties as a function of dopant concentrations are described and upconversion efficiencies quantified precisely. Maximum efficiencies of $ 1.53% in the 730-870 nm near-infrared emission range and of $ 0.09% in the 420-530 nm blue range are obtained. The results of power dependence studies and concentration dependent lifetime measurements are presented. This in-depth spectroscopic study allows us, for the first time, to identify the dominant processes involved in the upconversion mechanism of Yb 3þ , Tm 3þ co-doped Y 2 BaZnO 5 oxides.

Citric sol–gel synthesis and luminescence characteristics of Ca1−y Sr y La2−x Eu x ZnO5 phosphors

“…Specially, oxide materials exhibit excellent chemically, mechanically, and thermally stablility, therefore could be promising hosts for light applications [8][9][10]. For instance, ternary oxides defined by R 2 AMO 5 with R = rare-earth, A = alkalineearth and M = Cu or Zn atoms are found to have the desired luminescent properties for the efficient color tenability [11][12][13]. This family of ternary oxides having large band gaps can serve as a good luminescent host in accommodating rare-earth ions as dopants, and thereby yielding effective luminescence with high quantum efficiency [14].…”

Upconversion emissions in YAG glass ceramics doped with Tm3+/Yb3+ ions

“…2(b), only a YAG phase is identified and no peak is assigned to other crystalline phase. The lattice constant for Tm 3+ / Yb 3+ doped YAG glass ceramics is calculated to be 1.201 nm, which is consistent with the value of pure YAG crystal phase, and the Tm 3+ and Yb 3+ ions can be considered to take the position of Y 3+ in the lattice structure, because the radii of Tm 3+ (0.094 nm) and Yb 3+ (0.093 nm) are extremely similar to that of Y 3+ (0.096 nm) [38,39].…”

Unique ultraviolet upconversion emissions of BaGd2ZnO5:Yb3+, Pr3+

“…BaGd 2 ZnO 5 :6%Yb 3+ , 1%Pr 3+ was synthesized by Pecchini sol-gel reaction with analytical reagents [16][17][18][19]. Firstly, Gd(NO 3 ) 3 , Ba(NO 3 ) 2 , Zn(NO 3 ) 2 , and the respective dopants M(NO 3 ) 3 with M = Yb or Pr were dissolved in de-ionized water and heated at 70°C under continuous stirring.…”