Synthesis and luminescent properties of subglobose YBO3:Ln3+(Eu, Tb) phosphors

Abstract

Subglobose YBO 3 :Ln 3? (Eu, Tb) phosphors have been successfully synthesized via a simple solutionbased hydrothermal method using Y 2 (CO 3 ) 3 (H 2 O) 2 colloid spheres as the precursor. The crystal structure, morphology, chemical composition and photoluminescence property of the phosphors were investigated by X-ray diffraction (XRD), transmission electron microscope, Fourier transform infrared (FTIR) spectroscopy and fluorescence spectrophotometer. The as-prepared phosphors present subglobose morphology and have a diameter of about 1 lm. XRD and FTIR results confirm that the vaterite-type YBO 3 can be synthesized by this method. The YBO 3 :Eu 3? exhibited strong orange emission at 591 nm and red emission at 610 nm, which were respectively ascribed to the ( 5 D 0 -7 F 1 ) and ( 5 D 0 -7 F 2 ) transitions of Eu 3? . The YBO 3 :Tb 3? showed dominant green emission at 542 nm due to the 5 D 4 -7 F 5 transition of Tb 3? .

Controllable Synthesis, Formation Process, and Luminescence Performances of Diverse Yttrium Compounds with Hollow Structures

“…The excitation spectrum of YBO 3 :Tb 3+ includes two bands at 237 and 283 nm, and the corresponding emission profile is composed of four sharp peaks at 487, 494, 541, and 582 nm (Figure 6e), caused by the 5 D 4 → 7 F J (J = 6, 5, 4, and 3) transitions of Tb 3+ . 33 The emission spectrum is dominated by the 5 D 4 → 7 F 5 green-emitting transition line. Thus, the Eu 3+ -and Tb 3+ -doped samples can display bright red and green emission light under ultraviolet (UV) excitation (insets in Figure 6a,c,e).…”

“…The result demonstrates the presence of carbonates and indicates that the precursor is coated onto the PF template. After the calcination process, the characteristic peaks of PF and the Y(OH)CO 3 precursor nearly disappear (Figure S1c), and a newly appearing band at 566 cm −1 is ascribed to the stretching vibration of Y−O from the vaterite-type borates (Figure S1d), 33 revealing the transformation from Y(OH)CO 3 to the vaterite-type YBO 3 hydrothermal product. Finally, the absorption bands nearly disappear and the stretching vibrational modes of the B 3 O 9 9− group become more evident after the annealing process (Figure S1e), revealing the elimination of the PF template and the formation of the YBO 3 crystal.…”

“…The decay lifetime values of Y 2 O 3 :Eu 3+ , YBO 3 :Eu 3+ , and YBO 3 :Tb 3+ are 1.85, 2.17, and 3.65 ms, which agree with the previously reported results for other Eu 3+ -and Tb 3+ -doped Y 2 O 3 and YBO 3 phosphors. 13,33 For comparison, the Y 2 O 3 :Eu 3+ , Y 2 O 3 :Yb 3+ /Er 3+, and Y 2 O 3 :Yb 3+ /Ho 3+ phosphors were prepared in the absence of the PF template. The hollow spherical samples show superior luminescence performance compared with the samples prepared without PF template (Figure S2, Supporting Information).…”

“…The vibrational spectrum of vaterite-type orthoborate including B 3 O 9 9– groups involves triangular planar BO 3 3– , which is significantly different from the aragonite and calcite orthoborates. The new characteristic peaks of hydrothermal product PF@YBO 3 at 912 and 843 cm –1 are caused by the ring-stretching vibrational modes of the B 3 O 9 9– group in vaterite-type borates (Figure S1d), revealing the transformation from Y­(OH)­CO 3 to the vaterite-type YBO 3 hydrothermal product. Finally, the absorption bands nearly disappear and the stretching vibrational modes of the B 3 O 9 9– group become more evident after the annealing process (Figure S1e), revealing the elimination of the PF template and the formation of the YBO 3 crystal.…”

Hydrothermal method for Y2O3:Eu3+ uniform nanophosphors with different templates

“…These peaks are due to the carbonate which is formed by the reaction of Y 2 O 3 with carbon dioxide in the atmosphere, and it needs to be heated to over 1000 • C to be removed completely. [25][26][27] Additionally, the absorption peak at around 560 cm −1 is assigned to the lattice vibration of Y-O. 25 There are no more absorption peaks in Y 2 O 3 :Eu 3+ with PAA, PF and GA compared with template-free because the templates have been removed by the calcination process.…”