Preparation of LaF₃:Eu³⁺ Based Inorganic–Organic Hybrid Nanostructures via an Ion Exchange Method and Their Strong Luminescence

Abstract

Lanthanide doped inorganic-organic hybrid nanostructures have received much attention in recent years due to their strong luminescence sensitized by organic ligands via an energy transfer route. In this work, an ion exchange method was used to prepare Eu3+ doped LaF3 based inorganic-organic hybrid nanostructures with organic ligands. The undoped LaF3 nanoparticles were first synthesized by a hydrothermal method, and Eu3+ ions were then ion exchanged into these LaF. nanoparticles to form the Eu3+ doped LaF3 nanoparticles, which were then used to prepare the inorganic-organic hybrid nanostructures with benzoic acid and 2-thenoyltrifluoroacetone. As a result of the luminescence sensitization, strong luminescence was observed in these inorganic-organic hybrid nanostructures, and the luminescence enhancement was over 40 times. Dependence of the luminescence of the hybrid nanostructures on the doping concentration and amount of organic ligands was studied in detail, and optimization was conducted to obtain the maximum luminescence for the hybrid nanostructures.

Eu3+‐doped LaF3‐based inorganic–organic hybrid nanostructured materials for broad‐spectrum excitation and strong photoluminescence

“…The absorption peak at 742 cm −1 was attributed to the out‐of‐plane bending vibration of the benzene ring. [ 11 ]…”

“…The AR value of LaF 3 :5%Eu 3+ prepared by the hydrothermal method was 27.63% that of the LaF 3 :5%Eu 3+ prepared by Wang X.J. [ 11 ] This indicated that the lattice distortion of LaF 3 :Eu 3+ prepared by the hydrothermal method was less than that of LaF 3 :Eu 3+ prepared by the ion‐exchange method under the same Eu 3+ doping concentration.…”

“…The absorption peak at 742 cm À1 was attributed to the out-of-plane bending vibration of the benzene ring. [11] Figure 6 shows the SEM images of the composite prepared by adding 0.005 g of LaF 3 :Eu 3+ , and LaF 3 :Eu 3+ -BA/TTA/BA-TTA nanocrystals into PMMA, respectively. As seen in Figure 6, the nanocrystals were uniformly dispersed in PMMA.…”

“…Wang et al . [ 10,11 ] prepared LaF 3 :Eu 3+ nanostructures using an ion‐exchange method and found that the asymmetry ratio of nanostructures depends on the Eu 3+ doping concentration, which was increased from 2.77 to 2.98. Khudoleeva and colleagues [ 12 ] synthesized LaF 3 :Eu 3+ nanoparticles using an ion‐exchange method and increased the luminescence intensity of LaF 3 :Eu 3+ by surface modification of aromatic carboxylic acids to increase the luminescence intensity.…”

Growth of β-NaYF4:Eu3+ Crystals by the Solvothermal Method with the Aid of Oleic Acid and Their Photoluminescence Properties

“…Similarly, the emission peaks excited by an exciting light at 397 nm are the characteristic emissions of Eu 3+ ions, and they are assigned to the high-energy transition 5 D 2 → 7 F 3 at 515 nm and 5 D 1 → 7 F J (J = 0–2) at 530 nm, 541 nm, and 561 nm; low-energy transition 5 D 0 → 7 F J (J = 1–4) at 598 nm, 622 nm, 657 nm, and 702 nm, respectively [8,35]. The weaker emission peak at 598 nm corresponding to 5 D 0 → 7 F 1 is allowed by the magnetic dipole transitions due to Eu 3+ ions, located at a site with inversion symmetry, while the stronger emission peak at 622 nm, corresponding to 5 D 0 → 7 F 2 , is allowed by the electric dipole transitions that are a result of absence of inversion symmetry at the Eu 3+ lattice site [36,37,38,39].…”