Synthesis of LaOF:Eu³⁺ Nanoparticles with Strong Luminescence Enhanced by Organic Ligands

Abstract

LaOF:Eu3+ nanoparticles were successfully prepared by annealing LaF3:Eu3+ nanocrytsals which were capped with SiO2 shell. The SiO2 shell effectively prohibited the growth of LaF3:Eu3+ nanocrystals during the annealing process, and it was etched off after annealing to obtain the LaOF:Eu3+ nanoparticles. The LaOF:Eu3+ nanoparticles had a size comparable to the original LaF3:Eu3+ nanoparticles. Inorganic–organic hybrid nanoparticles of LaF3:Eu3+ and LaOF:Eu3+ nanoparticles with thenoyltrifluoroacetone (TTA) ligands were prepared. Strong luminescence as a result of the energy transfer from the TTA organic ligands to the LaF3:Eu3+ and LaOF:Eu3+ nanoparticles was observed. The LaOF:Eu3+‐based hybrid nanoparticles exhibited stronger luminescence intensity and broader excitation spectral range than the LaF3:Eu3+‐based hybrid nanoparticles. Effect of the content of TTA ligands on the luminescence of the LaOF:Eu3+ nanoparticles was investigated in detail.

One-pot synthesis of 2-thenoyltrifluoroacetone surface functionalised SrF2:Eu3+ nanoparticles: trace level detection of water

“…The spectrum shows a number of peaks at 361, 376/381, and 395 nm, which correspond to 7 F 0 / 5 D 4 , 7 F 0 / 5 G 6 , 7 F 1 / 5 L 7 , 7 F 0 / 5 L 6 transitions of Eu 3+ respectively. 45 Among these peaks the strongest one is observed at 395 nm which has been used to excite Eu 3+ . Excitation spectra of SrF 2 :Eu 3+ @TTA were recorded by monitoring emissions at 580, 591 and 614 nm and have been shown in Fig.…”

Broadening the Photoluminescence Excitation Spectral Bandwidth of YVO4:Eu3+ Nanoparticles via a Novel Core-Shell and Hybridization Approach

“…At last, the YVO 4 :Eu 3+ @YVO 4 :Eu 3+ –TTA inorganic–organic hybrid nanoparticles were synthesized by the previously described procedures [17,18]. It was found in this work that both the as-synthesized YVO 4 :Eu 3+ and the annealed YVO 4 :Eu 3+ cannot form YVO 4 :Eu 3+ –TTA inorganic–organic hybrid structures.…”

“…In this work, a novel strategy was employed to remarkably broaden the excitation spectrum of YVO 4 :Eu 3+ nanoparticles through a dual–channel excitation approach, and the entire UV spectrum of the solar irradiance can be effectively covered. This was implemented by combining the two strong excitation channels, the efficient VO 4 3− →Eu 3+ energy transfer after annealing and the photoluminescence sensitization by organic ligand after forming an inorganic–organic hybrid nanoparticle [16,17].…”

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

“…31 The much weaker peaks at 395 nm ( 7 F 0 → 5 L 6 ) and 466 nm ( 7 F 0 → 5 D 2 ) are the characteristic excitation of Eu 3+ ions. 19 In Figure 6(b), the intensity of the emission peak at 618 nm ( 5 D 0 → 7 F 2 ) of the LaF 3 :Eu 3+ -TTA hybrid nanostructures is about 44 times stronger than the as-prepared LaF 3 :Eu 3+ nanoparticles. The inset in Figure 6(b) shows the photograph of the LaF 3 :Eu 3+ -TTA hybrid nanostructures with different amounts of TTA ligands (LaF 3 :Eu 3+ :TTA = 1:0.1, 1:1) under a 365 nm UV light illumination.…”