Controllable synthesis and tunable luminescence properties of Y2(WO4)3:Ln3+ (Ln = Eu, Yb/Er, Yb/Tm and Yb/Ho) 3D hierarchical architectures

Abstract

Yttrium tungstate precursors with novel 3D hierarchical architectures assembled from nanosheet building blocks were successfully synthesized by a hydrothermal method with the assistance of sodium dodecyl benzenesulfonate (SDBS). After calcination, the precursors were easily converted to Y(2)(WO(4))(3) without an obvious change in morphology. The as-prepared precursors and Y(2)(WO(4))(3) were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM), and photoluminescence (PL) spectra, respectively. The results reveal that the morphology and dimensions of the as-prepared precursors can be effectively tuned by altering the amounts of organic SDBS and the reaction time, and the possible formation mechanism was also proposed. Upon ultraviolet (UV) excitation, the emission of Y(2)(WO(4))(3):x mol% Eu(3+) microcrystals can be tuned from white to red, and the doping concentration of Eu(3+) has been optimized. Furthermore, the up-conversion (UC) luminescence properties as well as the emission mechanisms of Y(2)(WO(4))(3):Yb(3+)/Ln(3+) (Ln = Er, Tm, Ho) microcrystals were systematically investigated, which show green (Er(3+), (4)S(3/2), (2)H(11/2)→(4)I(15/2)), blue (Tm(3+), (1)G(4)→(3)H(6)) and yellow (Ho(3+), (5)S(2)→(5)I(8)) luminescence under 980 nm NIR excitation. Moreover, the doping concentration of the Yb(3+) has been optimized under a fixed concentration of Er(3+) for the UC emission of Y(2)(WO(4))(3):Yb(3+)/Er(3+).

Hydrothermal synthesis, multicolor tunable luminescence and energy transfer of Eu3+ or/and Tb3+ activated NaY(WO4)2 nanophosphors

“…Therefore, they are recently considered as promising host materials for rare-earth luminescent centers because of the special properties of WO 4 2-& Guixia Liu liuguixia22@163.com group [11][12][13][14]. From the report of Huang et al [15], it was seen that tungstate host essentially showed a little weaker blue emission at room temperature compared to the absorption in excitation spectrum, owing to efficient energy transfer from WO 4 2-group to activators. Liu et al [16] had also discovered that NaY(WO 4 ) 2 exhibited a broad emission centered at approximately 469 nm without doping Ln 3? ions, and the intensity of this emission decreased when Ln 3?…”

Up/down conversion luminescence and charge compensation investigation of Ca0.5Y1−x(WO4)2:xLn3+ (Ln=Pr, Sm, Eu, Tb, Dy, Yb/Er) phosphors

“…The crystallite size values for Ca 0.5 Y(WO 4 ) 2 doped with Pr 3+ , Sm 3+ , Eu 3+ , Tb 3+ , Dy 3+ and Yb 3+ /Er 3+ are found between 30.0 and 42.0 nm and the cell parameters and its volume are given in Table S1 (Supplementary Material). 7 Scanning electron microscopy and energy dispersive X-ray analysis were used to determine the morphology and chemical composition of elements in the prepared sample. In this context, as a representative candidate for the analysis, 0.…”

PEG-assisted hydrothermal synthesis and photoluminescence of CdMoO4:Tb3+ green phosphor

“…In modern materials science, the ability to prepare nano-and microstructures with well-defined morphology and excellent monodispersity in bulk scale is an essential requirement for applications of materials [1,2]. Till now, it is generally accepted that the morphology, dimensionality, and crystal structure of the materials all play important roles in the electronic, optical, magnetic, catalytic, chemical, and other physical properties [3][4][5].…”