Controllable hydrothermal synthesis of Eu³⁺/Tb³⁺/Dy³⁺ activated Zn₈[(BO₃)₃O₂(OH)₃] micro/nanostructured phosphors: energy transfer and tunable emissions

Abstract

When Eu3+ and Tb3+ ions are co-doped into the ZBH matrix, the phosphor yielded tunable emissions. The concentration of rare earth doped can change the composition and further change the morphology and the luminescence properties.

Luminescence properties in relation to controllable morphologies of Ba3[Ge2B7O16(OH)2](OH)(H2O):Eu3+ and its thermal conversion product Ba3Ge2B6O16:Eu3+

“…Other weak peaks are attributed to the f-f transitions of Eu 3+ . 28 Fig. 5 shows the emission spectra of the samples with different concentrations of doped Eu 3+ upon excitation at 242 nm wavelength.…”

“…The other weak peaks are ascribed to the f-f transitions of Eu 3+ . 28 The emission spectra (excited at 242 nm) of the 3% Eu 3+ -doped hexagonal-ake morphology of Ba 3 [Ge 2 -B 7 O 16 (OH) 2 ](OH)(H 2 O):Eu 3+ prepared by varying the reaction time (24 h, 48 h, 72 h, 96 h) is shown in Fig. 6.…”

“…Other weak peaks are attributed to the f-f transitions of Eu 3+ . 28 The emission spectra of 3% Eu 3+ -doped Ba 3 -[Ge 2 B 7 O 16 (OH) 2 ](OH)(H 2 O):Eu 3+ prepared with different boron source raw materials under UV excitation are shown in Fig. 7.…”

“…The excitation spectra exhibit a strong charge transfer band (CTB) from the 2p orbital of O 2Àto the 4f orbital of Eu 3+ with a maximum peak at about 242 nm. Other weak peaks are attributed to the f-f transition of Eu 3+ 28. The emission spectra of Ba 3 Ge 2 B 6 O 16 :Eu 3+ phosphor prepared by the precursor method and the solid-state method are shown Fig.9A.…”

A novel synthesis of nanoflower-like zinc borate from zinc oxide at room temperature

“…Various techniques have been used so far for the synthesis of zinc borate nanostructures [14][15][16][17]. However, most of them require temperature [3], modifying agents [16,[18][19][20], template [17], which may lead to the highcost problems.…”