Study on continuous preparation of nano europium oxide ethanol sols decorated in situ by pulsed laser ablation and their luminescence characteristics

Eu2O3 microsphere luminescent material based on aerosol jet printing

“…As a corroboration, the TEM results showed that the samples calcined at 1000℃ consist of well-defined microspherical nanostructures with diameters of approximately 100~500 nm, as shown in Figure 3h. The lattice fringe is 0.3161 nm, as shown in Figure 3i, which is chosen to be the {222} lattice planes of cubic Eu2O3 [12,13]. These results reveal that the pure cubic Eu2O3 phase was formed after calcination at 1000℃.…”

“…Figure 4 exhibits the excitation and emission spectra of the Eu2O3 nanoparticles at the various calcination temperatures, and there is also a group of fluorescence intensity data of Eu2O3 phosphors prepared by the ammonia precipitation method (the calcination temperature is 500℃) as the control group to compare the intensity of luminescence. According to the literature [10][11][12][13][14][15][16][17][18][19], the excitation peak wavelength of Eu 3+ is 393 nm. Therefore, the Eu 3+ emission spectrum is excited by the wavelength of 393 nm, as shown in Figure 4a.…”

Study on preparation and fluorescence characteristic of coordinated Eu2O3/polymer hybrid films

“…3, there is a strong absorptive peak at 199.6 nm, a middle absorptive peak at 219.6 nm, a weak absorptive peak at 258.3 nm, and a weak absorptive peak at 342.5 nm in UV-vis spectrum of the coordinated Eu 2 O 3 /PS hybrid film. Similarly, there is a strong absorptive peak at 201.0 nm, a middle absorptive peak at 219.7 nm, a weak absorptive peak at 265.3 nm, and a weak absorptive peak at [29]; the middle peaks at 219.6 and 219.7 nm and the weak peaks at 258.3 and 265.3 nm may be attributed to the transitions from the 7 F 0 ground state to charge transfer states due to the europiumoxygen interaction [2]; and the wide peaks in 342.5 and 338.5 nm can be attributed to the electronic transitions from pp* of TTA ligands [29]. Because TTA is coordinated to the surface europium ions of the Eu 2 O 3 nanoparticles resulting in larger conjugation, its characteristic absorptive peak shifts from 334.0 [29] to 342.5 and 338.5 nm, respectively.…”

“…Because the ligand of TTA which coordinated to the surface Eu 3+ ions of the Eu 2 O 3 nanoparticles has strong absorption at about 340 nm, the broad excitation peaks at the wavelength of 338-368 nm are the characteristic absorption of the coordinated Eu 2 O 3 nanoparticles arising from the efficient transition based on the conjugated double bonds of the TTA ligands [17,29]. In addition, two kind of hybrid film can radiate intense red light under ultraviolet radiation, and their emission fluorescence spectra display same characteristic emission peaks of Eu 3+ ions.…”